blocks|key|2687200|text|我也有同样的问题。通过在build.gradle文件中添加缺失存储库的url来解决：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2687201|android+{
++++[...]
++++repositories+{
++++++++maven+{+url+'http://repo1.maven.org/maven2'+}
++++}
++++[...]
}|code-block|syntax|javascript|2687202|就这样。|2687203|entityMap^0|C|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

I had the same problem. Solved by adding url for missing repository in the <code>build.gradle</code> file:

<pre><code>android {
 [...]
 repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 }
 [...]
}
</code></pre>

That's it.

blocks|key|126308|text|只需从build.gradle文件中删除"testCompile+'junit:junit:4.12'“即可：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|126309|dependencies+{
compile+fileTree(dir:+'libs',+include:+['*.jar'])
testCompile+'junit:junit:4.12'//remove+this+line+and+sync+again...+worked+for+me

androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2',+{
++++exclude+group:+'com.android.support',+module:+'support-annotations'})+//if+available,+also+delete+these+two+lines

compile+'com.android.support:appcompat-v7:23.0.1'
+}|code-block|syntax|javascript|126310|为我工作，我很高兴！:)|126311|请记住，这不是这个问题的实际答案。我之所以提到这一点，是因为当您删除上面的行时，它会起作用。|126312|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Just remove the "testCompile 'junit:junit:4.12'" from build.gradle file:

<pre><code>dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'//remove this line and sync again... worked for me

androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
 exclude group: 'com.android.support', module: 'support-annotations'}) //if available, also delete these two lines

compile 'com.android.support:appcompat-v7:23.0.1'
 }
</code></pre>

worked for me and I am Happy! :) 

Remember that this is not the actual answer of this question. I mentioned this because it works when you remove above lines.

blocks|key|2899503|text|删除行testCompile+'junit:junit:4.12'|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2899504|dependencies+{
++compile+fileTree(dir:+'libs',+include:+['*.jar'])
++compile+'com.android.support:appcompat-v7:23.0.1'
+}|code-block|syntax|javascript|2899505|之后，再次同步项目。|2899506|entityMap^0|3|U|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

<h1>Remove the line <code>testCompile 'junit:junit:4.12'</code></h1>
<pre><code>dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 compile 'com.android.support:appcompat-v7:23.0.1'
 }
</code></pre>
After that sync the project again.

blocks|key|127183|text|在build.gradle文件中添加存储库|type|unstyled|depth|inlineStyleRanges|entityRanges|data|127184|repositories+{
++++maven+{+url+'http://repo1.maven.org/maven2'+}
}|code-block|syntax|javascript|127185|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

add repository in your build.gradle file

<pre><code>repositories {
 maven { url 'http://repo1.maven.org/maven2' }
}
</code></pre>

blocks|key|2899586|text|我在创建新项目后收到此错误。在build.gradle文件中，我有以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2899587|jcenter()|code-block|syntax|javascript|2899588|我将其更改为以下内容，错误就消失了：|2899589|jcenter+{
++++url+"http://jcenter.bintray.com/"
}|2899590|我想这是因为我在防火墙后面，像这样指定url将其从https更改为http。|2899591|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I received this error after creating a new project. In the build.gradle file, I had this: 

<pre><code>jcenter()
</code></pre>

I change it to the following and the error went away: 

<pre><code>jcenter {
 url "http://jcenter.bintray.com/"
}
</code></pre>

I think this is because I am behind a firewall and specifying the url like so changes it from https to http

blocks|key|2687346|text|也许你是proxy的幕后黑手。发生在我身上，使用我的移动tethering+(无代理)重建项目和错误消失。已返回到原始连接(使用代理)并重新构建，没有错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2687347|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Probably you are behind proxy. Happened to me, used my mobile tethering (no proxy) rebuild project and error disappeared. Returned to original connection (with proxy) and rebuild with no errors.

blocks|key|128773|text|它无法获取junit库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|128774|repositories+{
++++++++maven+{+url+'http://repo1.maven.org/maven2'+}
++++}|code-block|syntax|javascript|128775|在build.gradle文件中的android块中添加上述行后，解决了问题。这可能是因为你的Android+studio没有junit库。|128776|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It's not able to get junit library.

<pre><code>repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 }
</code></pre>

After adding above line inside android block in build.gradle file, it resolved problem.
This can be because your Android studio doesn't have junit library.

blocks|key|2687426|text|只需尝试编译和运行您的项目，同时有活动的互联网连接。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2687427|我在Android+studio+1.5+Ubuntu+15.04上也用得上|2687428|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Simply try to compile and run you project while having active internet connection. 

it worked for me in Android studio 1.5 Ubuntu 15.04

blocks|key|2899758|text|dependencies+{
++++compile+fileTree(dir:+'libs',+include:+['*.jar'])
+++++++compile+'com.android.support:appcompat-v7:23.1.1'
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2899759|注意:删除testCompile+'junit:junit:4.12‘行已经解决了我的问题。|unstyled|offset|length|style|BOLD|2899760|entityMap^0|0|0|1A|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 compile 'com.android.support:appcompat-v7:23.1.1'
}
</code></pre>

Note: Remove testCompile 'junit:junit:4.12' line has been solved my problem.

blocks|key|126454|text|像这样修改你的build.gradle，对我来说没问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|126455|apply+plugin:+'com.android.application'

android+{
++++compileSdkVersion+23
++++buildToolsVersion+"22.0.1"
++++repositories+{
++++++++maven+{+url+'http://repo1.maven.org/maven2'+}
++++}
++++defaultConfig+{
++++++++applicationId+"YOUR+PACKAGE+NAME"
++++++++minSdkVersion+15
++++++++targetSdkVersion+23
++++++++versionCode+1
++++++++versionName+"1.0"
++++}
++++buildTypes+{
++++++++release+{
++++++++++++minifyEnabled+false
++++++++++++proguardFiles+getDefaultProguardFile('proguard-android.txt'),+'proguard-rules.pro'
++++++++}
++++}
}

dependencies+{
++++compile+fileTree(dir:+'libs',+include:+['*.jar'])
++++testCompile+'junit:junit:4.12'
++++compile+'com.android.support:appcompat-v7:23.0.0'
}|code-block|syntax|javascript|126456|已添加|126457|++++repositories+{
++++++++maven+{+url+'http://repo1.maven.org/maven2'+}
++++}|126458|转到android|offset|length|style|CODE|126459|entityMap^0|0|0|0|0|2|7|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

CHANGE your build.gradle like with this, work fine for me:

<pre><code>apply plugin: 'com.android.application'

android {
 compileSdkVersion 23
 buildToolsVersion "22.0.1"
 repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 }
 defaultConfig {
 applicationId "YOUR PACKAGE NAME"
 minSdkVersion 15
 targetSdkVersion 23
 versionCode 1
 versionName "1.0"
 }
 buildTypes {
 release {
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 }
 }
}

dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 testCompile 'junit:junit:4.12'
 compile 'com.android.support:appcompat-v7:23.0.0'
}
</code></pre>

added 

<pre><code> repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 }
</code></pre>

to <code>android</code>

blocks|key|129508|text|它可能无法在指定的在线位置为build.gradle的这部分jar.check+(项目的gradle文件)获取它。您可能无权访问该位置(防火墙或其他问题)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|129509|repositories{
//some+location+like+jcenter()+or+maven{.some+location++}
}|code-block|syntax|javascript|129510|这样做:下载jar文件，将下面这行添加到|129511|repositories+{
++++++++//previous+codes+untouched
++++++++flatDir+{
++++++++++++dirs+'location+to+jar'
++++++++}
}|129512|希望这能起作用;)|129513|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

It might be it is not able to get it at the specified online location for the jar.check this part of build.gradle (gradle file for project). you might not be having access to the location(firewall or other issues)

<pre><code>repositories{
//some location like jcenter() or maven{.some location }
}
</code></pre>

Do this:
download the jar 
add this line inside the 

<pre><code>repositories {
 //previous codes untouched
 flatDir {
 dirs 'location to jar'
 }
}
</code></pre>

hope that works ;)

blocks|key|128887|text|可能您的gradle不完整，我建议您添加以下内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|128888|android{
++++repositories+{
++++maven+{+url+'http://repo1.maven.org/maven2'+}
}|code-block|syntax|javascript|128889|但在某些情况下不起作用，你可以将它从你的gradle依赖中完全删除。|128890|我想如果你在user+folder+.gradle中有删除gradle文件夹的条件，重新安装android+studio就可以了。|offset|length|style|BOLD|CODE|128891|entityMap^0|0|0|0|0|H|I|7|I|7|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|U|8|@$K|V|L|W|M|N]|$K|X|L|Y|M|N]|$K|Z|L|10|M|O]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|Q|$]]

Probably your gradle is incomplete, I recommend you add the following 

<pre><code>android{
 repositories {
 maven { url 'http://repo1.maven.org/maven2' }
}
</code></pre>

but in some cases won't work , you can completely delete it from you dependencies in your gradle.

I think it will be OK if you reinstall the android studio with the deleting gradle folder condition which is in user folder <code>.gradle</code>

blocks|key|2687675|text|转到“文件”“->项目结构”。将打开以下窗口：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2687676|​|2687677|📷|atomic|offset|length|2687678|2687679|从那里开始：|2687680|2687681|删除junit库(选择junit并按下下面的"-“按钮)，然后|ordered-list-item|2687682|再次添加它(选择下面的"%2B”按钮，选择"library+dep."，搜索"junit"，按OK+)。按OK应用更改。大约30秒后，您的gradle同步应该可以正常工作。|2687683|2687684|希望它也适用于你:D|2687685|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a93c2a859e4df69af81f1378d42f95ff.png|imageAlt^0|0|0|0|1|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|15|8|@]|9|@$G|16|H|17|1|18]]|A|$]]|$1|I|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1A|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|1C|8|@]|9|@]|A|$]]|$1|P|3|Q|5|O|7|1D|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1F|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11|12|-4]]]]

Go to File -> Project Structure. Following window will open:

<a href="https://i.stack.imgur.com/5WvS3.png"><img src="https://i.stack.imgur.com/5WvS3.png" alt="enter image description here"></a>

From there:

<ol>
<li>remove the junit library (select junit and press "-" button below ) and</li>
<li>add it again (select "+" button below, select "library dep.", search for "junit", press OK ). Press OK to apply changes. After around 30 seconds your gradle sync should work fine.</li>
</ol>

Hope it works for you too :D

blocks|key|2900010|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2900011|dependencies+{
++++compile+fileTree(include:+['*.jar'],+dir:+'libs')
++++//testCompile+'junit:junit:4.12'
++++compile+'com.android.support:appcompat-v7:23.3.0'
++++compile+'com.android.support:design:23.3.0'
++++compile+'com.google.code.gson:gson:2.2.4'
}|code-block|syntax|javascript|2900012|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>dependencies {
 compile fileTree(include: ['*.jar'], dir: 'libs')
 //testCompile 'junit:junit:4.12'
 compile 'com.android.support:appcompat-v7:23.3.0'
 compile 'com.android.support:design:23.3.0'
 compile 'com.google.code.gson:gson:2.2.4'
}
</code></pre>

blocks|key|128959|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|128960|请确保您不在代理后面！|ordered-list-item|128961|如果您将Android+Strudio配置为使用代理，请确保禁用Android+Studio+preferences+|128962|下的该选项。请转到Android+Studio中Android视图下的gradle.properties，删除所有proxy+configuration|128963|Sync+your+gradle+now|128964|享受编码！|128965|128966|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|O|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|P|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|Q|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|R|7|@]|8|@]|9|$]]|$1|H|3|I|4|C|6|S|7|@]|8|@]|9|$]]|$1|J|3|K|4|C|6|T|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|U|7|@]|8|@]|9|$]]|$1|M|3|-4|4|5|6|V|7|@]|8|@]|9|$]]]|N|$]]

<ol>
<li>Be sure you are not behind a proxy! </li>
<li>If you configured your Android Strudio to work with proxy be sure to
disable that option under the Android Studio preferences </li>
<li>Go to gradle.properties under Android view in Android Studio and
delete all proxy configuration</li>
<li>Sync your gradle now</li>
<li>Enjoy coding!</li>
</ol>

blocks|key|2900111|text|转到文件->项目结构->依赖项，您将在那里找到->+junit:unit:4.12|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2900112|在右侧，从下拉菜单中编译..select。简单..。完成了。|2900113|参考图像：|2900114|📷|atomic|offset|length|2900115|​|2900116|Reds的VV|2900117|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a93c2a859e4df69af81f1378d42f95ff.png|imageAlt^0|0|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|10|8|@]|9|@$I|11|J|12|1|13]]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]]]

Go to File -> Project Structure -> dependency
There you will find -> junit:unit:4.12

On the right hand side ..select compile from the drop down.
Simple.. its done.

Reference Image: <a href="https://i.stack.imgur.com/5WvS3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5WvS3.png" alt="http://i.stack.imgur.com/5WvS3.png"></a>

Reds'
VV

blocks|key|127452|text|如果你在代理后面。Android+Studio会将http的代理添加到Gradle，但不会添加https的代理。将https的代理设置添加到gradle.properties|type|unstyled|depth|inlineStyleRanges|entityRanges|data|127453|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you are behind a proxy. Android Studio will add proxy for http to Gradle, but will not for https.
Add proxy settings for https to gradle.properties

blocks|key|128992|text|如果您使用代理服务器，只需在gradle.properties中添加您的代理设置|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|128993|systemProp.http.proxyHost=x.xx.xx.x

systemProp.http.proxyPort=xxxx

systemProp.https.proxyHost=x.xx.xx.x

systemProp.https.proxyPort=xxxx|code-block|syntax|javascript|128994|这对我很管用。|128995|entityMap^0|E|H|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

If you're behind a proxy server, just add your proxy settings in gradle.properties 

<pre><code>systemProp.http.proxyHost=x.xx.xx.x

systemProp.http.proxyPort=xxxx

systemProp.https.proxyHost=x.xx.xx.x

systemProp.https.proxyPort=xxxx
</code></pre>

It worked for me.

blocks|key|2900258|text|以下是我为解决相同问题所做的工作。我在防火墙后面，我想这和你的问题是一样的。所以我试着移除了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2900259|testCompile+'junit:junit:4.12'+line+|code-block|syntax|javascript|2900260|但这对我不起作用。我尝试添加以下几行代码：|2900261|repositories+{
++++maven+{+url+'http://repo1.maven.org/maven2'+}
}|2900262|即使这样对我来说也不起作用。|2900263|我尝试从Module+Settings下的库依赖项中删除(-)和readding+(%2B)+Junit4.12。尽管如此，这对我来说还是不起作用。|2900264|已多次尝试同步和重建项目。对我来说还是不起作用。|2900265|最后，我从mvnrepository网站手动下载了Junit4.12.jar文件。我将这个jar文件放在了Androids工作区的libs文件夹中的Project文件夹下。然后转到Module+Settings+>+Dependencies+Tab+>+(%2B)+>+File+Dependency+>在Sleect+path窗口下，展开'libs‘文件夹，您将在其中找到您复制的Jar文件。选择文件并单击“确定”，现在从依赖项列表中删除junit4.12的以前版本。|2900266|现在点击“确定”。|2900267|2900268|希望这能有所帮助！|2900269|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|13|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|15|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|16|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|17|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|19|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|Y|$]]

Here is what I did to solve the same problem. I am behind a firewall, which is same issue as yours I suppose.
So I had tried removing the 

<pre><code>testCompile 'junit:junit:4.12' line 
</code></pre>

but that didnt work for me.
I tried adding below lines of code:

<pre><code>repositories {
 maven { url 'http://repo1.maven.org/maven2' }
}
</code></pre>

Even that did not work for me.

I tried removing (-) and readding (+) Junit4.12 from the library dependencies under Module Settings.
Still that did not work for me.

Tried syncing and rebuilding project several times. Still did not work for me.

Finally what I did was to manually download the Junit4.12.jar file from mvnrepository website. I put this jar file in the Androids Workspace under the Project folder inside libs folder.
Then go to Module Settings > Dependencies Tab > (+) > File Dependency >
under Sleect path window, expand the 'libs' folder and you will find the Jar file you copied inside there.
Select the File and click 'OK'
Now remove the previous version of junit4.12 from the list of dependencies.

You should have one entry <code>"libs\junit-4.12.jar"</code> in the Dependencies list.
Now click 'OK'.

Now Gradle will rebuild the project and you should be good to go.

Hope this helps!

blocks|key|2900361|text|这是因为HTTPS被代理阻止了。尝试从默认的jcenter+(使用HTTPS)更改为HTTP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2900362|在此之前|2900363|repositories+{
+++++jcenter()
}|code-block|syntax|javascript|2900364|之后|2900365|repositories+{
++++jcenter+{
++++++++//Default+one+is+HTTPS
++++++++url+"http://jcenter.bintray.com/"
++++}
}|2900366|对所有项目重复上述步骤。|2900367|allprojects+{
++repositories+{
++++jcenter+{
++++++++url+"http://jcenter.bintray.com/"
++++}
++}
}|2900368|或者从jcenter更改为mavenCentral也是可行的|2900369|repositories+{
+++mavenCentral()
}|2900370|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

It happens because HTTPS is blocked by Proxy.
Try to change from default jcenter (which uses HTTPS) into HTTP. 
Before
<pre><code>repositories {
 jcenter()
}
</code></pre>
After
<pre><code>repositories {
 jcenter {
 //Default one is HTTPS
 url &quot;http://jcenter.bintray.com/&quot;
 }
}
</code></pre>
Repeat the above step for allprojects. 
<pre><code>allprojects {
 repositories {
 jcenter {
 url &quot;http://jcenter.bintray.com/&quot;
 }
 }
}
</code></pre>
Or changing from jcenter to mavenCentral also worked
<pre><code>repositories {
 mavenCentral()
}
</code></pre>

blocks|key|2688078|text|我的Android+Studio安装完全脱机。为了解决这类问题，我使用了进程监视器。它显示"Android+Studio\gradle\m2pository“中缺少一些文件。我已经从下载了所有文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688079|2688080|http://repo1.maven.org/maven2/junit/junit/4.12/|ordered-list-item|offset|length|2688081|http://repo1.maven.org/maven2/org/hamcrest/hamcrest-core/|2688082|repo1.maven.org/maven2/org/hamcrest/hamcrest-parent/1.3/+(我只能发布两个链接...；-))|2688083|2688084|并将这些文件复制到"Android+Studio\gradle\m2pository“中。你必须在"m2repository“下面创建结构，因为它在"maven2”下面。也许会有更多的文件丢失，但至少在这个时候Gradle构建已经完成了，没有出现错误。|2688085|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|1B|0|0|0|1L|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Y|8|@]|9|@$F|Z|G|10|1|11]]|A|$]]|$1|H|3|I|5|E|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|J|3|K|5|E|7|16|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|18|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|D]]|V|$5|R|S|T|A|$U|I]]]]

My installation of Android Studio is completely offline. To resolve these kind of problems I have used the Process Monitor. It showed that a few files are missing within "Android Studio\gradle\m2repository".
I have downloaded all files from

<ol>
<li><a href="http://repo1.maven.org/maven2/junit/junit/4.12/" rel="nofollow">http://repo1.maven.org/maven2/junit/junit/4.12/</a></li>
<li><a href="http://repo1.maven.org/maven2/org/hamcrest/hamcrest-core/" rel="nofollow">http://repo1.maven.org/maven2/org/hamcrest/hamcrest-core/</a></li>
<li>repo1.maven.org/maven2/org/hamcrest/hamcrest-parent/1.3/
(I can only post two links...;-))</li>
</ol>

and copied these files in "Android Studio\gradle\m2repository". You have to create the structure below "m2repository" as it is below "maven2".
Maybe there are more missing files, but at this time at least Gradle build is finished without errors.

blocks|key|129835|text|如果您遇到此问题，可以通过更改以下命令来完全解决它:|type|unstyled|depth|inlineStyleRanges|entityRanges|data|129836|Build.gradle(项目：...)|129837|替换此|offset|length|style|BOLD|129838|++++buildscript+{
++++repositories+{
++++++++jcenter()
++++}
++++dependencies+{
++++++++classpath+'com.android.tools.build:gradle:2.0.0'

++++++++//+NOTE:+Do+not+place+your+application+dependencies+here;+they+belong
++++++++//+in+the+individual+module+build.gradle+files
++++}
}

allprojects+{
++++repositories+{
++++++++mavenCentral()

++++}
}

task+clean(type:+Delete)+{
++++delete+rootProject.buildDir
}|code-block|syntax|javascript|129839|entityMap^0|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@$F|T|G|U|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|V|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

if you faced this problem you can completely resolve it by changing :
build.gradle(project: ...)
replace this
<pre><code> buildscript {
 repositories {
 jcenter()
 }
 dependencies {
 classpath 'com.android.tools.build:gradle:2.0.0'

 // NOTE: Do not place your application dependencies here; they belong
 // in the individual module build.gradle files
 }
}

allprojects {
 repositories {
 mavenCentral()

 }
}

task clean(type: Delete) {
 delete rootProject.buildDir
}
</code></pre>

blocks|key|2688176|text|我尝试了所有的方法，但唯一能帮助我解决问题的就是删除这行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688177|testCompile+'junit:junit:4.12'|code-block|syntax|javascript|2688178|来自应用程序gradel。|2688179|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I'll tryed everithing, but the only thing that helps me resolve the problem was delete the line 

<pre><code>testCompile 'junit:junit:4.12'
</code></pre>

from the app gradel.

blocks|key|129948|text|您是否在使用proxy？如果是这样，问题可能出在您的gradle.properties文件中缺少https的网络配置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|129949|AndroidStudio自动将您的默认代理设置放入项目中的gradle.properties文件中，但只针对http并忘记https。|129950|所以基本上你的gradle.properties文件需要同时包含http和https配置：|129951|systemProp.http.proxyPassword=xxx
systemProp.http.proxyHost=xxx
systemProp.http.nonProxyHosts=xxx
systemProp.http.proxyUser=xxx
systemProp.http.proxyPort=xxx

systemProp.https.proxyPassword=xxx
systemProp.https.proxyHost=xxx
systemProp.https.nonProxyHosts=xxx
systemProp.https.proxyUser=xxx
systemProp.https.proxyPort=xxx|code-block|syntax|javascript|129952|entityMap^0|0|B|1C|5|Q|H|0|U|H|0|7|H|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|Y|8|@$9|Z|A|10|B|D]]|E|@]|F|$]]|$1|I|3|J|5|6|7|11|8|@$9|12|A|13|B|D]]|E|@]|F|$]]|$1|K|3|L|5|M|7|14|8|@]|E|@]|F|$N|O]]|$1|P|3|-4|5|6|7|15|8|@]|E|@]|F|$]]]|Q|$]]

Are you using proxy? If so, the problem can be in missing network configuration for https in your <code>gradle.properties</code> file. 

AndroidStudio puts automatically your default proxy settings to <code>gradle.properties</code> file in your project, but only for http and forgets https.

So basically your <code>gradle.properties</code> file needs to contain both http and https config:

<pre><code>systemProp.http.proxyPassword=xxx
systemProp.http.proxyHost=xxx
systemProp.http.nonProxyHosts=xxx
systemProp.http.proxyUser=xxx
systemProp.http.proxyPort=xxx

systemProp.https.proxyPassword=xxx
systemProp.https.proxyHost=xxx
systemProp.https.nonProxyHosts=xxx
systemProp.https.proxyUser=xxx
systemProp.https.proxyPort=xxx
</code></pre>

blocks|key|2688399|text|大多数情况下，当你在项目创建Gradle构建失败的时候更新你的SDK时，这个问题就会出现。如果您将maven和jcenter存储库添加到您的build.gradle(模块:应用程序)中，您的问题就会得到解决。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2688400|repositories+{
++++maven+{+url+'http://repo1.maven.org/maven2'+}
++++jcenter+{+url+"http://jcenter.bintray.com/"+}
}|code-block|syntax|javascript|2688401|下面是你必须添加的两行|2688402|apply+plugin:+'com.android.application'+|2688403|这是添加这两行代码后的样子|2688404|apply+plugin:+'com.android.application'

+repositories+{
++++++++maven+{+url+'http://repo1.maven.org/maven2'+}
++++++++jcenter+{+url+"http://jcenter.bintray.com/"+}
++++}

android+{
++++compileSdkVersion+23
++++buildToolsVersion+"23.0.1"

++++defaultConfig+{
++++++++applicationId+"com.okedroid.myapplication"
++++++++minSdkVersion+17
++++++++targetSdkVersion+23
++++++++versionCode+1
++++++++versionName+"1.0"
++++}
++++buildTypes+{
++++++++release+{
++++++++++++minifyEnabled+false
++++++++++++proguardFiles+getDefaultProguardFile('proguard-android.txt'),+'proguard-rules.pro'
++++++++}
++++}
}|2688405|entityMap^0|1D|5|1J|7|0|0|0|0|0|D|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|T|$]]

Mostly this issue will come when ever you update your SDK, at the time of project creation Gradle build fails. If you add the maven and jcenter repositories to your build.gradle(Module:app) your problem will solved.

<pre><code>repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 jcenter { url "http://jcenter.bintray.com/" }
}
</code></pre>

These are the two line you have to add after 

<pre><code>apply plugin: 'com.android.application' 
</code></pre>

This is how your code look like after adding those two lines

<pre><code>apply plugin: 'com.android.application'

 repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 jcenter { url "http://jcenter.bintray.com/" }
 }

android {
 compileSdkVersion 23
 buildToolsVersion "23.0.1"

 defaultConfig {
 applicationId "com.okedroid.myapplication"
 minSdkVersion 17
 targetSdkVersion 23
 versionCode 1
 versionName "1.0"
 }
 buildTypes {
 release {
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 }
 }
}
</code></pre>

blocks|key|129219|text|我也有同样的问题，但有另一个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|129220|我的另一个问题是Gradle构建太慢了！|129221|我通过使用thisL解决了我的问题|129222|如果您确实喜欢mdew，那么在创建项目的任何时候都需要这样做|129223|因此，如果您想将默认选项设置为maven|129224|执行以下操作：|129225|转到文件夹：|129226|C:\Program+Files\Android\Android+Studio\plugins\android\lib\templates\gradle-projects\NewAndroidProject\root|code-block|syntax|javascript|129227|然后使用notepad%2B%2B或记事本打开build.gradle.ftl文件，并将所有jcenter()替换为mavenCentral()。|offset|length|style|CODE|129228|编辑:为什么它会被投票表决？你不喜欢吗？|129229|entityMap^0|0|0|0|0|0|0|0|0|J|G|16|9|1I|E|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|19|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1A|8|@$U|1B|V|1C|W|X]|$U|1D|V|1E|W|X]|$U|1F|V|1G|W|X]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1H|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|11|$]]

I had the same problem, but with another problem.

My other problem was that the Gradle build was too slow!

I resolved my problem by doing thisL

If you do like mdew you need to this any time you're creating your project to do this

So if you want to set default option to maven 

Do this: 

Go to the folder:

<pre><code>C:\Program Files\Android\Android Studio\plugins\android\lib\templates\gradle-projects\NewAndroidProject\root
</code></pre>

Then open the <code>build.gradle.ftl</code> file with notepad++ or notepad
and replace all <code>jcenter()</code> with <code>mavenCentral()</code>.

EDIT: Why its going down voted? you don't like it?

blocks|key|127928|text|我也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|127929|127930|1选项:下载junit+4.12.jar并将其复制到您的lib文件夹中，然后重启android+studio。好处你不必创建任何新的项目|unordered-list-item|127931|2选项:创建一个新的项目，有互联网连接，并复制所有的java和XML代码在新创建的项目。优势此问题将永久解决|127932|127933|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|L|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|M|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|N|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|J|$]]

I was having same problem.

<ul>
<li>1 option: Download junit 4.12.jar and copy it in your lib folder and restart android studio. Benefit u don't have to create any new project</li>
<li>2 option: Create a new project having a internet connections and copy all the java and XML code in the newly created project. Benefit this problem will be solved permantly</li>
</ul>

blocks|key|127941|text|寻找许多答案，但都不起作用。幸运的是找到了简单的解决方案。不需要注释junit4.12或将其删除。问题出在这里：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|127942|-+androidTestCompile+files('libs/junit-4.12.jar')|code-block|syntax|javascript|127943|这部分向我们展示了在的项目的库中查找文件的路径。不知道为什么，但由于某种原因，默认情况下它是空的。在我的例子中，路径是：|127944|C:\Users\arzakhar\AndroidStudioProjects\MyApp\app\libs|127945|当然，您可以在代码build.grandle(Module.app)中删除此行，但稍后可能需要它。以下是解决方案：|offset|length|style|CODE|127946|1-下载junit-4.12.jar或从你的Android+Studio文件夹中复制它，通常它应该在那里。在我的例子中，它在这里：|127947|C:\Program+Files\Android\Android+Studio\lib|127948|到上面提到的目录(到您的项目)|127949|2-删除和添加|127950|​|127951|📷|atomic|127952|127953|3-重建|127954|4-努力工作|127955|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/228210ab6b39de8eeb442b5f69ef73c6.png|imageAlt^0|0|0|0|0|9|P|0|0|0|0|0|0|0|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1I|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1J|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1L|8|@$M|1M|N|1N|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1S|8|@]|9|@]|A|$]]|$1|10|3|11|5|12|7|1T|8|@]|9|@$M|1U|N|1V|1|1W]]|A|$]]|$1|13|3|Z|5|6|7|1X|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|18|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|19|$1A|$5|1B|1C|1D|A|$1E|1F|1G|-4]]]]

Look through for many answers but nothing works. Fortunately had found the easy solution. No need to comment junit4.12 or delete it. The problem is here:

<pre><code>- androidTestCompile files('libs/junit-4.12.jar')
</code></pre>

This part shows us the path to look for the file in the library in your's project. No idea why but for some reason by the default it is empty. In my case the path is:

<pre><code>C:\Users\arzakhar\AndroidStudioProjects\MyApp\app\libs
</code></pre>

Sure you can delete this line in code <code>build.grandle(Module.app)</code> but you may need it later. Here is the solution:

1 - download junit-4.12.jar or copy it from you Android Studio folder, normally it should be there. In my case, it was here: 

<pre><code>C:\Program Files\Android\Android Studio\lib
</code></pre>

to the directory mentioned above(to your project)

2 - delete &amp; add

<a href="https://i.stack.imgur.com/X4gBs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/X4gBs.png" alt="here you should re-enter the root to your junit-4.12.jar "></a>

3 - rebuild

4 - work hard

blocks|key|130049|text|我不明白为什么Android+Studio不能与gradle同步。结果发现它不喜欢我的VPN，所以要注意了！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130050|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I couldn't work out why Android Studio was not syncing with gradle. It turned out that it didn't like my VPN, so watch for that!

blocks|key|2688566|text|该错误是由于缺少jar文件而导致的。我的简单解决方案是将所有未解析的文件复制到C:\Program+Files\Android\Android+Studio\gradle\m2存储库...(您的文件路径可能不同)。我得到了大约6个无法解决的依赖项，junit是其中之一，其他的是com、org和javax。由于我在防火墙后面，即使我添加了存储库的代码，Android+Studio似乎也无法访问它。我去了maven仓库，下载了所有无法解析的文件。问题已解决，Gradle同步没有错误。但我是一个认证的新手，只有一天的经验，所以我不知道这是不是正确的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688567|示例错误:无法解析com:squareup:javawriter:2.1.1|2688568|步骤1:创建路径C:\Program+Files\Android\Android+Studio\gradle\m2repository\com\squareup\javawriter\2.1.1\|2688569|步骤2:我从maven存储库下载了所有的jar文件：http://repo1.maven.org/maven2/com/squareup/javawriter/2.1.1/|offset|length|2688570|步骤3:我手动下载了这个目录中的所有.jar文件|2688571|第四步:我把它们复制到C:\Program+Files\Android\Android+Studio\gradle\m2repository\com\squareup\javawriter\2.1.1\|2688572|我对所有未解析的文件重复此操作，包括junit。|2688573|对于junit，下面是我创建的目录:+C:\Program+Files\Android\Android+Studio\gradle\m2pository\+junit+\junit\4.12，然后我将junit-4.12.jar复制到这个目录中，junit错误就消失了。|2688574|entityMap|0|LINK|mutability|MUTABLE|url|http://repo1.maven.org/maven2/com/squareup/javawriter/2.1.1/^0|0|0|0|Q|1O|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@$H|13|I|14|1|15]]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|18|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

The error is caused by missing jar files. My simple solution is just by copying all the files that does not resolve to the C:\Program Files\Android\Android Studio\gradle\m2repository... (your file path may be different). I got around 6 dependencies that cannot be resolved, junit is one of them and the others are com and org and javax. Since I am behind a firewall, even if I added the code for the repository, the Android Studio doesn't seem to access it. I went to the maven repository and downloaded all the files that will not resolve. Problem solved and the Gradle sync without error. But I am a certified newbie with only 1 day experience so I do not not if this is the proper way to do it. 

Example error: 
Cannot resolve com:squareup:javawriter:2.1.1

Step 1: I created a path C:\Program Files\Android\Android Studio\gradle\m2repository\com\squareup\javawriter\2.1.1\ 

Step 2: I downloaded all the jar files from the maven repository: 
<a href="http://repo1.maven.org/maven2/com/squareup/javawriter/2.1.1/" rel="nofollow">http://repo1.maven.org/maven2/com/squareup/javawriter/2.1.1/</a>

Step 3: I manually downloaded all the .jar files from this directory

Step 4: I copied them to C:\Program Files\Android\Android Studio\gradle\m2repository\com\squareup\javawriter\2.1.1\ 

I repeated this to all the files that did not resolve including the junit.

For junit, here is the directory I created: 
C:\Program Files\Android\Android Studio\gradle\m2repository\junit\junit\4.12
and then I copied the junit-4.12.jar inside this directory and the junit error disappeared.

blocks|key|2901069|text|转到“属性”选项卡中的“文件”“->”“项目结构”“->”应用程序“。在"Library+Repository“field中输入'http://repo1.maven.org/maven2‘，然后按Ok。这对我来说就是这样的。现在项目正在编译。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2901070|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/xrZM7.png|1|http://repo1.maven.org/maven2^0|1K|5|0|1T|T|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Go to Go to "File" -> "Project Structure" -> "App"
In the tab "properties". In "Library Repository" <a href="https://i.stack.imgur.com/xrZM7.png" rel="nofollow">field</a> put '<a href="http://repo1.maven.org/maven2" rel="nofollow">http://repo1.maven.org/maven2</a>' then press Ok.
It was fixed like that for me. Now the project is compiling.

blocks|key|2901130|text|只需连接到Internet并启动Android+Studio，然后打开您的项目。当Gradle+Sync时，它将从Internet下载依赖项(所有JAR文件)。这为我解决了问题。没有编辑Gradle文件，所有的都是由Android+Studio自动完成的。使用Android+Studio+2.2+:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2901131|另外，不要忘记安装Java+JDK+1.x(7或8都可以)。|2901132|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Just connect to Internet and start Android Studio and open your project.
While Gradle Sync it will download the dependencies from Internet(All JAR Files). This solved it for me.
No Editing in Gradle file ,all was done by Android Studio Automatically.
Using Android Studio 2.2 :)

Also don't forget to install Java JDK 1.x(7 or 8 all works fine).

blocks|key|130156|text|当你不在公司防火墙后面时，使用Android+Studio会很自然地解决这个问题。但是如果你在公司的防火墙后面，这个问题就会发生。因此，下载文件将是一种变通方法。在您自己的家庭网络上，更新Android+Studio将解决此问题，并将要求您删除那些您手动创建的文件。只需按OK，因为删除它们是安全的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130157|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

When you are not behind a company firewall, using the Android Studio will resolve that issue naturally. But if you are behind a company firewall, this problem will occur. So downloading the files will be a workaround. On your own home network, updating Android Studio will resolve the issue and will ask you to delete those files that you have manually created. Just press OK as it is safe to remove them.

blocks|key|2688682|text|我很乐意提出一个解决方案，它完美地适合我的情况：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688683|2688684|首先，确保添加|unordered-list-item|2688685|2688686|存储库{+maven+{+url+'http://repo1.maven.org/maven2‘}}|offset|length|2688687|添加到buildscript+{}+block|style|CODE|2688688|中的项目级build.gradle文件，然后添加|2688689|2688690|所有项目{存储库{+maven+{+url+'http://repo1.maven.org/maven2‘}}|2688691|对于项目级build.gradle文件|2688692|，下一点是添加|2688693|2688694|存储库{+jcenter()+mavenCentral()+}|2688695|到buildTypes{+}内部的模块级构建|2688696|entityMap|0|LINK|mutability|MUTABLE|url|http://repo1.maven.org/maven2|1^0|0|0|0|0|I|T|0|0|3|E|0|0|0|N|T|1|0|0|0|0|0|1|D|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1D|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|1F|8|@]|9|@$I|1G|J|1H|1|1I]]|A|$]]|$1|K|3|L|5|6|7|1J|8|@$I|1K|J|1L|M|N]]|9|@]|A|$]]|$1|O|3|P|5|E|7|1M|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1O|8|@]|9|@$I|1P|J|1Q|1|1R]]|A|$]]|$1|T|3|U|5|6|7|1S|8|@]|9|@]|A|$]]|$1|V|3|W|5|E|7|1T|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1V|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1W|8|@$I|1X|J|1Y|M|N]]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]|1A|$5|15|16|17|A|$18|19]]]]

I would love to suggest the solution, which perfects suitable for my situation:

<ul>
<li>at first, make sure add 

<pre><code>repositories {
 maven { url 'http://repo1.maven.org/maven2' }
}
</code></pre>

to project-level build.gradle file inside the <code>buildscript {}</code> block</li>
<li>then add 

<pre><code>allprojects {
 repositories {
 maven { url 'http://repo1.maven.org/maven2' }
 }
</code></pre>

to project-level build.gradle file</li>
<li>the next point is adding 

<pre><code>repositories {
 jcenter()
 mavenCentral()
}
</code></pre>

to module-level build-gradle inside <code>buildTypes{ }</code></li>
</ul>

blocks|key|2901199|text|将存储库更改为除jcenter()之外的mavenCentral()，一切正常|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2901200|entityMap^0|8|9|K|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Change repository to <code>mavenCentral()</code> except <code>jcenter()</code> everything will be Ok

blocks|key|2688698|text|在我的情况下，它是非常有线的！除了添加正确的代理(我在一家公司工作)之外，我还需要在依赖项中添加另外两个库：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688699|compile+'com.android.support:appcompat-v7:25.0.1'
compile+'com.android.support:design:25.0.1'|code-block|syntax|javascript|2688700|然后解决了"junit:junit:4.12“的错误。确保build.gradle中的所有依赖项都与您在项目结构中导入的内容相匹配|offset|length|style|BOLD|2688701|entityMap^0|0|0|R|T|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In my case was it was very wired! Besides adding a correct proxy (I'm working within a company), I needed to add the other two libraries in the dependencies:

<pre><code>compile 'com.android.support:appcompat-v7:25.0.1'
compile 'com.android.support:design:25.0.1'
</code></pre>

then the error for "junit:junit:4.12" was resolved. 
Make sure that all of the dependencies in build.gradle match what you import in project structure

blocks|key|2901229|text|如果任何人收到错误“failed-+to+-resolve-Junitjuit4-12”，请转到HTTP+PRoxy设置，检查您的互联网连接。如果您在学校/大学使用任何代理服务器，则设置您的代理设置并测试连接，如果成功，则应用设置并再次运行gradle，您将得到resolve+all错误。我尝试这样做，我解决了所有的错误。注意:不需要删除Junit....!！乌马尔|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2901230|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If any one get error "failed-to-resolve-junitjunit4-12" then go to HTTP PRoxy setting check your internet connection. if you are using any proxy server at school / college then set your proxy setting and test connect if it successful then apply setting and run again gradle you will get resolve all error. I try this and i resolve all errors. 
Note : no need to remove Junit....!!
Umair

blocks|key|2901238|text|我也有同样的问题，但是当我打开我的项目并打开Internet连接时，当gradle构建同步时，我清除了所有内容，它自动下载了相关文件，并且需要J+Unit插件进行测试|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2901239|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had same problem, but when I open my project with an Internet connection on,i got everything cleared when the gradle build a syncing it automatically downloaded the relevant files and the J Unit plugin is required for testing

blocks|key|2688714|text|如果这些答案都不能回答您，请尝试清除Android+Studio缓存/重新启动。这是唯一对我有效的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688715|从文件菜单选项中，我选择了“无效缓存/重新启动”。|2688716|https://teamtreehouse.com/community/gradle-project-sync-failed-7|offset|length|2688717|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1S|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

If none of these answers for you, try clearing the Android Studio cache/restart. That was the only thing that worked for me:

From the file menu option, I selected "invalidate caches/restart".

<a href="https://teamtreehouse.com/community/gradle-project-sync-failed-7" rel="nofollow noreferrer">https://teamtreehouse.com/community/gradle-project-sync-failed-7</a>

blocks|key|130191|text|您应该将Java寻址到windows。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130192|130193|打开此地址：‘控制面板\系统和security\system'|ordered-list-item|130194|From左侧选择’高级系统设置‘|130195|在高级选项卡中，选择’环境变量‘|130196|在打开的窗口中，在“系统变量”下面选择’新建‘。|130197|将变量名设置为JAVA_HOME，并将变量值设置为您安装的Java地址。例如，对我来说，它就是C:\ProgramFiles\Java\jdk1.8.0_66。之后，点击okay+button.|offset|length|style|CODE|130198|Restart+Android+Studio|130199|130200|entityMap^0|0|0|0|0|0|0|7|9|1B|W|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|12|8|@$N|13|O|14|P|Q]|$N|15|O|16|P|Q]]|9|@]|A|$]]|$1|R|3|S|5|E|7|17|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

You should to address Java to windows.

<ol>
<li>Open this address: 'control panel\system and security\system'</li>
<li>From left side choose 'Advanced system settings'</li>
<li>In the advanced tab, choose 'Environment Variables'</li>
<li>In opened window, below "system variables", choose 'New'.</li>
<li>Set variable name to <code>JAVA_HOME</code>, and the variable value to the address you installed Java. For example, for me it is <code>C:\ProgramFiles\Java\jdk1.8.0_66</code>. After that, click the okay button.</li>
<li>Restart Android Studio</li>
</ol>

blocks|key|2688778|text|在我的例子中，解决方案是添加|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688779|repositories+{
++++mavenCentral()
}|code-block|syntax|javascript|2688780|到模块级构建-buildTypes中的gradle{}|2688781|假设没有它，AndroidStudio就不能从maven下载junit。|2688782|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In my case the solution was to add 

<pre><code>repositories {
 mavenCentral()
}
</code></pre>

to module-level build-gradle inside buildTypes{ }

Suppose that without it AndroidStudio can't download junit from maven.

blocks|key|2688788|text|就我而言，这只是因为互联网连接。也许是一些代理或wifi防火墙或其他东西可能会干扰连接(因为当我手动访问链接时，here+chrome会说该文件可能会损害您的计算机)。所以我试着从我的手机上使用另一个连接，比如网络热点。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2688789|entityMap|0|LINK|mutability|MUTABLE|url|https://akamai.bintray.com/29/2973d150c0dc1fefe998f834810d68f278ea58ec?__gda__=exp=1509281604~hmac=fdd8d8c6176ce2797b554d457c75afbae43dfbaf171191ac991df0ce7676da1e&response-content-disposition=attachment%253Bfilename%253D%2522junit-4.12.jar%2522&response-content-type=application%252Foctet-stream&requestInfo=U2FsdGVkX195UmEgPMAUggFXseozjVc0D1ockYBTtcZjcgjPBT67shgODeI2rde0edg4p2d4cJ4V92UkqXj4U0POK-i4CIh7Y48uHDqoxxppGcJ_6a1-8Gn3abX19Tlfnullnull^0|1K|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

In my case, it's just because internet connection. Maybe some proxy or wifi firewall or other things which is probably disturb the connection (Because when I visit the link manually <a href="https://akamai.bintray.com/29/2973d150c0dc1fefe998f834810d68f278ea58ec?__gda__=exp=1509281604~hmac=fdd8d8c6176ce2797b554d457c75afbae43dfbaf171191ac991df0ce7676da1e&amp;response-content-disposition=attachment%3Bfilename%3D%22junit-4.12.jar%22&amp;response-content-type=application%2Foctet-stream&amp;requestInfo=U2FsdGVkX195UmEgPMAUggFXseozjVc0D1ockYBTtcZjcgjPBT67shgODeI2rde0edg4p2d4cJ4V92UkqXj4U0POK-i4CIh7Y48uHDqoxxppGcJ_6a1-8Gn3abX19Tlfnullnull" rel="nofollow noreferrer">here</a> chrome said the file may harm your computer). So I tried using another connection such tethering hotspot from my phone.

blocks|key|127140|text|这个答案可能有点晚了，但在花了几个小时研究答案之后，对我来说什么都不起作用。在耐心地阅读了错误日志后，我意识到android+studio试图使用带有错误哈希码的缓存版本的JUnit。此问题的解决方案是删除C:\Android\caches\modules-2目录并重新启动构建。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|127141|希望这能有所帮助！|127142|entityMap^0|2V|R|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

This answer might be a bit late, but after spending a few hours working through the answers nothing worked for me.
After reading the error log patiently i realized that android studio tried to use a cached version of JUnit with a wrong hash code.
The solution to this was to delete the <code>C:\Android\caches\modules-2</code> directory and restart the build.

Hope this helps!

blocks|key|130252|text|之前：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|130253|testImplementation+'junit:junit:4.12'
androidTestImplementation+'com.android.support.test:runner:1.0.2'
androidTestImplementation+'com.android.support.test.espresso:espresso-core:3.0.2'|code-block|syntax|javascript|130254|之后：|130255|testİmplementation+'junit:junit:4.12'+
androidTestİmplementation+'com.android.support.test:runner:1.0.2'+
androidTestİmplementation+'com.android.support.test.espresso:espresso-core:3.0.2'++|130256|对我很管用。|130257|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Before:

<pre><code>testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
</code></pre>

After:

<pre><code>testİmplementation 'junit:junit:4.12' 
androidTestİmplementation 'com.android.support.test:runner:1.0.2' 
androidTestİmplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 
</code></pre>

Worked for me.

blocks|key|2901477|text|在我的例子中，我只需添加：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2901478|allprojects+{
repositories+{
++++jcenter()
++++maven+{+url+'https://maven.google.com'+}
}|code-block|syntax|javascript|2901479|}|2901480|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In my case, I just add:

<pre><code>allprojects {
repositories {
 jcenter()
 maven { url 'https://maven.google.com' }
}
</code></pre>

}

blocks|key|2688858|text|删除所有Junit依赖项，并在依赖项上添加此内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2688859|testImplementation+'junit:junit:4.12'
androidTestImplementation+'androidx.test.ext:junit:1.1.2'
androidTestImplementation+'androidx.test.espresso:espresso-core:3.3.0'
androidTestImplementation+'androidx.test:runner:1.3.0'
androidTestImplementation+'androidx.test:rules:1.3.0'
androidTestImplementation+'androidx.test:core:1.3.1-alpha02'|code-block|syntax|javascript|2688860|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Erase all the Junit dependencies and add this on the dependencies.
<pre><code>testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
androidTestImplementation 'androidx.test:runner:1.3.0'
androidTestImplementation 'androidx.test:rules:1.3.0'
androidTestImplementation 'androidx.test:core:1.3.1-alpha02'
</code></pre>

Why is it that every time I create a new project in Android Studio, it always comes up with:

<blockquote>
 Error:(23, 17) Failed to resolve: junit:junit:4.12?
</blockquote>

When I remove <code>testCompile 'junit:junit:4.12'</code> in dependencies it is not a problem anymore.

build.gradle

<pre><code>apply plugin: 'com.android.application'

android {
 compileSdkVersion 23
 buildToolsVersion "23.0.1"

 defaultConfig {
 applicationId "com.okedroid.myapplication"
 minSdkVersion 17
 targetSdkVersion 23
 versionCode 1
 versionName "1.0"
 }
 buildTypes {
 release {
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 }
 }
}

dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 testCompile 'junit:junit:4.12'
 compile 'com.android.support:appcompat-v7:23.0.1'
}
</code></pre>

Error:(23, 17) Failed to resolve: junit:junit:4.12

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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为什么每次我在Android Studio中创建一个新项目时，它总是会出现：错误：(23，17)无法解决: junit:junit:4.12？当我删除依赖项中的testCompile 'junit:junit:4.12'时，这不再是一个问题。build.gradleapply plugin: 'com.android....

问错误：(23，17)无法解析: junit:junit:4.12
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