blocks|key|1396911|text|您必须检查日志以了解导致崩溃的异常。在日志(IDE的下半部分)中，将有异常的名称、启动它的元素以及指向发现问题的代码行的链接。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1396912|如果仍然无法通过这种方式找到错误，可以在调试期间希望应用程序停止的代码行左侧设置断点，然后在调试模式下运行应用程序以查看到底发生了什么。|1396913|另一个技巧:通常，当我确信我的代码是正确的，但它运行但崩溃，这是关于声明清单中的所有活动(或所有服务)并设置所有所需的权限。因为在这种情况下，在运行应用程序之前没有明显的错误。让我们知道！|1396914|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You must check the Log to see what is the exception which caused the crash. In the log (lower part of the IDE) there will be the name of the Exception, the element which launched it and also there will be the links to the lines of the code where the problem was found. 

If you still can't find the error this way, you can set breakpoints at the left of the lines of code where you want the application stops during debug, and then run the app in the debug mode to see exactly what happens.

Another tip: often, when I was sure about the rightness of my code and it runs but crashes, it's about having declared all the Activities in the manifest (or all the Services) and to have set all required permission. Because in this case there are no apparent errors before running the app. Let us know!

blocks|key|1795841|text|好吧，这可能是关于Toolbar的，让我们看看它是如何工作的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1795842|在android中使用widget工具栏比使用actionbar更好，因为...|1795843|为此，您必须在Gradle+(+v7+:app)中添加(如果没有)+appcompact模块库，如下所示：|1795844|dependecies+{++compile+'com.android.support:appcompat-v7:%2B'++}|code-block|syntax|javascript|1795845|要删除操作栏并插入工具栏，您必须：|1795846|+1.+remove+actionbar+from+manifest+setting+a+no+actionbar+style:
+++++<application
++++++++++android:theme="@style/Theme.AppCompact.Light.NoActionBar"
++++++/>

+2.+insert+Toolbar+widget+into+the+layout+of+the+activity:
+++++<LinearLayout+...>
++++++++++...
++++++++++<android.support.v7.widget.Toolbar
+++++++++++++++android:id="@%2Bid/mytoolbar"
+++++++++++++++android:layout_width="match_parent"
+++++++++++++++android:layout_height="?attr/actionBarSize"
+++++++++++++++android:background="?attr/colorPrimary"
+++++++++++++++android:elevation="8dp"
+++++++++++++++android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
+++++++++++++++android:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

++++++++++</LinearLayout>

+3.+insert+the+widget+into+the+activity+and+set+it+as+support+toolbar:
++++++@Override
+++++protected+void+onCreate(Bundle+savedInstanceState){
+++++++++++super.onCreate(savedInstanceState);
+++++++++++setContentView(R.layout.activity_main);
+++++++++++Toolbar+myToolbar+=+(Toolbar)+findViewById(R.id.mytoolbar);
+++++++++++myToolbar.setLogo(R.mipmap.ic_launcher);
+++++++++++myToolbar.setTitle("Titolo");
+++++++++++myToolbar.setSubtitle(R.string.sottotitolo);
+++++++++++setSupportActionBar(myToolbar);
+++++}

+4.+create+a+menù+for+the+Toolbar,+into+res>menu
+<?xml+version="1.0"+encoding="utf-8"?>
+<menu+xmlns:android="http://schemas.android.com/apk/res/android">
++++<item+android:id="@%2Bid/new_game"
++++++android:icon="@drawable/ic_new_game"
++++++android:title="@string/new_game"
++++++android:showAsAction="ifRoom"/>
++++<item+android:id="@%2Bid/help"
++++++android:icon="@drawable/ic_help"
++++++android:title="@string/help"
++++++android:showAsAction="never"/>
++++<item+android:id="@%2Bid/tutorials"
++++++android:icon="@drawable/ic_tuts"
++++++android:title="@string/tutorials"
+++++++++++++++android:showAsAction="always"/>
+++++</menu>

+5.+bind+menù+to+toolbar+through+the+two+methods+into+the+activity:


@Override
public+boolean+onCreateOptionsMenu(Menu+menu){
+++++//Inflate+the+menu;+this+adds+items+to+the+action+bar+if+it+is+present
+++++getMenuInflater().inflate(R.menu.menu_main,+menu);
+++++return+true;
}

@Override
public+boolean+onOptionsItemSelected(MenuItem+item)+{
++++//+Handle+item+selection
++++switch+(item.getItemId())+{
++++++++case+R.id.new_game:
++++++++++++newGame();
++++++++++++return+true;
++++++++case+R.id.help:
++++++++++++showHelp();
++++++++++++return+true;
++++++++default:
++++++++++++return+super.onOptionsItemSelected(item);
++++}
}|1795847|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Ok, it could be about Toolbar, let's see how it works.

In android is better using the widget toolbar instead of actionbar because...

To do that you must add (if there is not) the appcompact v7 library in Gradle (module:app), just like this:

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

To remove the action bar and insert a toolbar you must:

<pre><code> 1. remove actionbar from manifest setting a no actionbar style:
 &lt;application
 android:theme="@style/Theme.AppCompact.Light.NoActionBar"
 /&gt;

 2. insert Toolbar widget into the layout of the activity:
 &lt;LinearLayout ...&gt;
 ...
 &lt;android.support.v7.widget.Toolbar
 android:id="@+id/mytoolbar"
 android:layout_width="match_parent"
 android:layout_height="?attr/actionBarSize"
 android:background="?attr/colorPrimary"
 android:elevation="8dp"
 android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
 android:popupTheme="@style/ThemeOverlay.AppCompat.Light"/&gt;

 &lt;/LinearLayout&gt;

 3. insert the widget into the activity and set it as support toolbar:
 @Override
 protected void onCreate(Bundle savedInstanceState){
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Toolbar myToolbar = (Toolbar) findViewById(R.id.mytoolbar);
 myToolbar.setLogo(R.mipmap.ic_launcher);
 myToolbar.setTitle("Titolo");
 myToolbar.setSubtitle(R.string.sottotitolo);
 setSupportActionBar(myToolbar);
 }

 4. create a menù for the Toolbar, into res&gt;menu
 &lt;?xml version="1.0" encoding="utf-8"?&gt;
 &lt;menu xmlns:android="http://schemas.android.com/apk/res/android"&gt;
 &lt;item android:id="@+id/new_game"
 android:icon="@drawable/ic_new_game"
 android:title="@string/new_game"
 android:showAsAction="ifRoom"/&gt;
 &lt;item android:id="@+id/help"
 android:icon="@drawable/ic_help"
 android:title="@string/help"
 android:showAsAction="never"/&gt;
 &lt;item android:id="@+id/tutorials"
 android:icon="@drawable/ic_tuts"
 android:title="@string/tutorials"
 android:showAsAction="always"/&gt;
 &lt;/menu&gt;

 5. bind menù to toolbar through the two methods into the activity:


@Override
public boolean onCreateOptionsMenu(Menu menu){
 //Inflate the menu; this adds items to the action bar if it is present
 getMenuInflater().inflate(R.menu.menu_main, menu);
 return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
 // Handle item selection
 switch (item.getItemId()) {
 case R.id.new_game:
 newGame();
 return true;
 case R.id.help:
 showHelp();
 return true;
 default:
 return super.onOptionsItemSelected(item);
 }
}
</code></pre>

blocks|key|1795828|text|有时它是由于xml文件中的id重复而发生的，例如，如果你有两个xml文件，比如Main+activity和Home，你都有ID为myTextview的Textview，所以一旦在你的类中使用了这个(Id)，android+studio就不会算作错误，但是一旦你点击了，应用程序就会在这两个活动中崩溃。Enyoy编码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1795829|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|$]]

Sometimes it occurs due to repeating of ID from xml file, example, if you have two xml files such Main activity and Home, both you have Textview with id myTextview, so once use this(id) in you class, android studio will not count as error but apps will crash at both activity once you click.'
Enyoy Coding.

So I'm incredibly new to Android studio. I typically just watch tutorials and follow along to learn what everything is and see how everything works. I was trying to follow a tutorial for a card view/recycler view with a collapsilbe toolbar, and after finishing the code (almost exactly as the guy in the video showed), the app still won't run. Only thing I changed were icon, a couple drawables and some of the values (I edited it all around in the code). 

Here's the post of the source code I followed: <a href="https://github.com/delaroy/AndroidCardView?files=1" rel="nofollow">https://github.com/delaroy/AndroidCardView?files=1</a>

As I said, there's no errors or anything. But when I run the app, it crashes immediately. 

This is also my first post, so if any other info is needed, let me know. 

As I said, I changed only pictures and a few names of the variables and such. Also, everything that was changed was fixed in values and such. 

I've ran other apps on my phone with no issue. 

Not sure if it's a phone issue or what. 

I'm using a Note 3 running Android 5.0.

No errors in Android studio, app still crashes on open

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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所以我对Android studio还是个新手。我通常只看教程，然后跟着学习，了解每件事是什么，看看每件事是如何工作的。我试着按照一个带有折叠工具栏的卡片视图/回收器视图的教程，在完成代码后(几乎与视频中的人显示的完全相同)，应用程序仍然不能运行。我唯一改变的是图标，几个可绘制的和一些值(我在代码中对其进行了编辑)。下...

问Android studio中没有错误，应用程序在打开时仍会崩溃
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