blocks|key|218901|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218902|public+class+MainActivity+extends+AppCompatActivity+{
++++@Override
++++protected+void+onCreate(Bundle+savedInstanceState)+{
++++++++super.onCreate(savedInstanceState);

++++++++//+Add+respective+layout
++++++++setContentView(R.layout.main_activity);

++++++++//+Use+package+name+which+we+want+to+check
++++++++boolean+isAppInstalled+=+appInstalledOrNot("com.check.application");++
++++++++
++++++++if(isAppInstalled)+{
++++++++++++//This+intent+will+help+you+to+launch+if+the+package+is+already+installed
++++++++++++Intent+LaunchIntent+=+getPackageManager()
++++++++++++++++.getLaunchIntentForPackage("com.check.application");
++++++++++++startActivity(LaunchIntent);
++++++++++++++++++++
++++++++++++Log.i("SampleLog",+"Application+is+already+installed.");++++++++++
++++++++}+else+{
++++++++++++//+Do+whatever+we+want+to+do+if+application+not+installed
++++++++++++//+For+example,+Redirect+to+play+store

++++++++++++Log.i("SampleLog",+"Application+is+not+currently+installed.");
++++++++}
++++}

++++private+boolean+appInstalledOrNot(String+uri)+{
++++++++PackageManager+pm+=+getPackageManager();
++++++++try+{
++++++++++++pm.getPackageInfo(uri,+PackageManager.GET_ACTIVITIES);
++++++++++++return+true;
++++++++}+catch+(PackageManager.NameNotFoundException+e)+{
++++++++}

++++++++return+false;
++++}

}|code-block|syntax|javascript|218903|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 with this:
<pre><code>public class MainActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 // Add respective layout
 setContentView(R.layout.main_activity);

 // Use package name which we want to check
 boolean isAppInstalled = appInstalledOrNot(&quot;com.check.application&quot;); 
 
 if(isAppInstalled) {
 //This intent will help you to launch if the package is already installed
 Intent LaunchIntent = getPackageManager()
 .getLaunchIntentForPackage(&quot;com.check.application&quot;);
 startActivity(LaunchIntent);
 
 Log.i(&quot;SampleLog&quot;, &quot;Application is already installed.&quot;); 
 } else {
 // Do whatever we want to do if application not installed
 // For example, Redirect to play store

 Log.i(&quot;SampleLog&quot;, &quot;Application is not currently installed.&quot;);
 }
 }

 private boolean appInstalledOrNot(String uri) {
 PackageManager pm = getPackageManager();
 try {
 pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
 return true;
 } catch (PackageManager.NameNotFoundException e) {
 }

 return false;
 }

}
</code></pre>

blocks|key|218905|text|上面的代码对我不起作用。下面的方法起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218906|使用适当的信息创建一个Intent对象，然后使用以下函数检查Intent是否可调用：|218907|private+boolean+isCallable(Intent+intent)+{++
++++++++List<ResolveInfo>+list+=+getPackageManager().queryIntentActivities(intent,+++
++++++++PackageManager.MATCH_DEFAULT_ONLY);++
++++++++return+list.size()+>+0;++
}|code-block|syntax|javascript|218908|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The above code didn't work for me. The following approach worked.

Create an Intent object with appropriate info and then check if the Intent is callable or not using the following function:

<pre><code>private boolean isCallable(Intent intent) { 
 List&lt;ResolveInfo&gt; list = getPackageManager().queryIntentActivities(intent, 
 PackageManager.MATCH_DEFAULT_ONLY); 
 return list.size() &gt; 0; 
}
</code></pre>

blocks|key|3086068|text|比公认的答案更简洁的解决方案(基于this+question)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3086069|public+static+boolean+isAppInstalled(Context+context,+String+packageName)+{
++++try+{
++++++++context.getPackageManager().getApplicationInfo(packageName,+0);
++++++++return+true;
++++}
++++catch+(PackageManager.NameNotFoundException+e)+{
++++++++return+false;
++++}
}|code-block|syntax|javascript|3086070|我选择将其作为静态实用程序放在助手类中。使用示例：|3086071|boolean+whatsappFound+=+AndroidUtils.isAppInstalled(context,+"com.whatsapp");|3086072|This+answer展示了如何在应用程序丢失的情况下从Play+Store获取应用程序，尽管在没有Play+Store的设备上需要小心。|3086073|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/q/6711295/56285|1|https://stackoverflow.com/a/11753070/808808^0|H|D|0|0|0|0|0|0|B|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]]]

Somewhat cleaner solution than the accepted answer (based on <a href="https://stackoverflow.com/q/6711295/56285">this question</a>):

<pre><code>public static boolean isAppInstalled(Context context, String packageName) {
 try {
 context.getPackageManager().getApplicationInfo(packageName, 0);
 return true;
 }
 catch (PackageManager.NameNotFoundException e) {
 return false;
 }
}
</code></pre>

I chose to put it in a helper class as a static utility. Usage example:

<pre><code>boolean whatsappFound = AndroidUtils.isAppInstalled(context, "com.whatsapp");
</code></pre>

<a href="https://stackoverflow.com/a/11753070/808808">This answer</a> shows how to get the app from the Play Store if the app is missing, though care needs to be taken on devices that don't have the Play Store.

blocks|key|218924|text|如果您知道包的名称，则无需使用try-catch块或迭代一大堆包即可执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218925|public+static+boolean+isPackageInstalled(Context+context,+String+packageName)+{
++++final+PackageManager+packageManager+=+context.getPackageManager();
++++Intent+intent+=+packageManager.getLaunchIntentForPackage(packageName);
++++if+(intent+==+null)+{
++++++++return+false;
++++}
++++List<ResolveInfo>+list+=+packageManager.queryIntentActivities(intent,+PackageManager.MATCH_DEFAULT_ONLY);
++++return+!list.isEmpty();
}|code-block|syntax|javascript|218926|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|$]]

If you know the package name, then this works without using a try-catch block or iterating through a bunch of packages:

<pre><code>public static boolean isPackageInstalled(Context context, String packageName) {
 final PackageManager packageManager = context.getPackageManager();
 Intent intent = packageManager.getLaunchIntentForPackage(packageName);
 if (intent == null) {
 return false;
 }
 List&lt;ResolveInfo&gt; list = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
 return !list.isEmpty();
}
</code></pre>

blocks|key|223935|text|这段代码检查以确保应用程序已安装，但也检查以确保其已启用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|223936|private+boolean+isAppInstalled(String+packageName)+{
++++PackageManager+pm+=+getPackageManager();
++++try+{
++++++++pm.getPackageInfo(packageName,+PackageManager.GET_ACTIVITIES);
++++++++return+pm.getApplicationInfo(packageName,+0).enabled;
++++}
++++catch+(PackageManager.NameNotFoundException+e)+{
++++++++e.printStackTrace();
++++++++return+false;
++++}
}|code-block|syntax|javascript|223937|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|$]]

This code checks to make sure the app is installed, but also checks to make sure it's enabled. 

<pre><code>private boolean isAppInstalled(String packageName) {
 PackageManager pm = getPackageManager();
 try {
 pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
 return pm.getApplicationInfo(packageName, 0).enabled;
 }
 catch (PackageManager.NameNotFoundException e) {
 e.printStackTrace();
 return false;
 }
}
</code></pre>

blocks|key|223951|text|我认为使用try/catch模式对性能不是很好。我建议使用这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|223952|public+static+boolean+appInstalledOrNot(Context+context,+String+uri)+{
++++PackageManager+pm+=+context.getPackageManager();
++++List<PackageInfo>+packageInfoList+=+pm.getInstalledPackages(PackageManager.GET_ACTIVITIES);
++++if+(packageInfoList+!=+null)+{
++++++++for+(PackageInfo+packageInfo+:+packageInfoList)+{
++++++++++++String+packageName+=+packageInfo.packageName;
++++++++++++if+(packageName+!=+null+&&+packageName.equals(uri))+{
++++++++++++++++return+true;
++++++++++++}
++++++++}
++++}
++++return+false;
}|code-block|syntax|javascript|223953|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|$]]

I think using try/catch pattern is not very well for performance. I advice to use this:

<pre><code>public static boolean appInstalledOrNot(Context context, String uri) {
 PackageManager pm = context.getPackageManager();
 List&lt;PackageInfo&gt; packageInfoList = pm.getInstalledPackages(PackageManager.GET_ACTIVITIES);
 if (packageInfoList != null) {
 for (PackageInfo packageInfo : packageInfoList) {
 String packageName = packageInfo.packageName;
 if (packageName != null &amp;&amp; packageName.equals(uri)) {
 return true;
 }
 }
 }
 return false;
}
</code></pre>

blocks|key|3086157|text|@埃格门·哈姆特苏在kotlin+B中的回答-)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3086158|++++private+fun+isAppInstalled(context:+Context,+uri:+String):+Boolean+{
++++++++val+packageInfoList+=+context.packageManager.getInstalledPackages(PackageManager.GET_ACTIVITIES)
++++++++return+packageInfoList.asSequence().filter+{+it?.packageName+==+uri+}.any()
++++}|code-block|syntax|javascript|3086159|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|$]]

@Egemen Hamutçu s answer in kotlin B-)

<pre><code> private fun isAppInstalled(context: Context, uri: String): Boolean {
 val packageInfoList = context.packageManager.getInstalledPackages(PackageManager.GET_ACTIVITIES)
 return packageInfoList.asSequence().filter { it?.packageName == uri }.any()
 }
</code></pre>

blocks|key|221966|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|221967|221968|此代码用于检查是否已安装带有包名的应用程序，如果未安装，则将打开应用程序的playstore链接，否则将打开已安装的应用程序|blockquote|221969|221970|221971|String+your_apppackagename="com.app.testing";
++++PackageManager+packageManager+=+getPackageManager();
++++ApplicationInfo+applicationInfo+=+null;
++++try+{
++++++++applicationInfo+=+packageManager.getApplicationInfo(your_apppackagename,+0);
++++}+catch+(PackageManager.NameNotFoundException+e)+{
++++++++e.printStackTrace();
++++}
++++if+(applicationInfo+==+null)+{
++++++++//+not+installed+it+will+open+your+app+directly+on+playstore
++++++++startActivity(new+Intent(Intent.ACTION_VIEW,+Uri.parse("https://play.google.com/store/apps/details?id="+%2B+your_apppackagename)));
++++}+else+{
++++++++//+Installed
++++++++Intent+LaunchIntent+=+packageManager.getLaunchIntentForPackage(your_apppackagename);
++++++++startActivity(+LaunchIntent+);
++++}|code-block|syntax|javascript|221972|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Q|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|T|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|N|$]]

<h1>Try this</h1>
<blockquote>
This code is used to check weather your application with package name is installed or
not if not then it will open playstore link of your app otherwise your
installed app
</blockquote>
<pre><code>String your_apppackagename=&quot;com.app.testing&quot;;
 PackageManager packageManager = getPackageManager();
 ApplicationInfo applicationInfo = null;
 try {
 applicationInfo = packageManager.getApplicationInfo(your_apppackagename, 0);
 } catch (PackageManager.NameNotFoundException e) {
 e.printStackTrace();
 }
 if (applicationInfo == null) {
 // not installed it will open your app directly on playstore
 startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(&quot;https://play.google.com/store/apps/details?id=&quot; + your_apppackagename)));
 } else {
 // Installed
 Intent LaunchIntent = packageManager.getLaunchIntentForPackage(your_apppackagename);
 startActivity( LaunchIntent );
 }
</code></pre>

blocks|key|3086219|text|使用Kotlin的更简单的实现|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3086220|fun+PackageManager.isAppInstalled(packageName:+String):+Boolean+=
++++++++getInstalledApplications(PackageManager.GET_META_DATA)
++++++++++++++++.firstOrNull+{+it.packageName+==+packageName+}+!=+null|code-block|syntax|javascript|3086221|并这样命名(seeking+for+Spotify+app)：|3086222|packageManager.isAppInstalled("com.spotify.music")|3086223|entityMap^0|2|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

A simpler implementation using Kotlin 

<pre><code>fun PackageManager.isAppInstalled(packageName: String): Boolean =
 getInstalledApplications(PackageManager.GET_META_DATA)
 .firstOrNull { it.packageName == packageName } != null
</code></pre>

And call it like this (seeking for Spotify app):

<pre><code>packageManager.isAppInstalled("com.spotify.music")
</code></pre>

blocks|key|219022|text|比公认的答案(基于AndroidRate+Library)更干净的解决方案(没有try-catch)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|219023|public+static+boolean+isPackageExists(@NonNull+final+Context+context,+@NonNull+final+String+targetPackage)+{
++++List<ApplicationInfo>+packages+=+context.getPackageManager().getInstalledApplications(0);
++++for+(ApplicationInfo+packageInfo+:+packages)+{
++++++++if+(targetPackage.equals(packageInfo.packageName))+{
++++++++++++return+true;
++++++++}
++++}
++++return+false;
}|code-block|syntax|javascript|219024|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Vorlonsoft/AndroidRate^0|9|J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Cleaner solution (without try-catch) than the accepted answer (based on <a href="https://github.com/Vorlonsoft/AndroidRate" rel="nofollow noreferrer">AndroidRate Library</a>):

<pre><code>public static boolean isPackageExists(@NonNull final Context context, @NonNull final String targetPackage) {
 List&lt;ApplicationInfo&gt; packages = context.getPackageManager().getInstalledApplications(0);
 for (ApplicationInfo packageInfo : packages) {
 if (targetPackage.equals(packageInfo.packageName)) {
 return true;
 }
 }
 return false;
}
</code></pre>

blocks|key|2872533|text|所有的答案只检查特定的应用程序是否已安装。但是，我们都知道，一个应用程序可以安装，但被用户禁用，不可用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2872534|因此，此解决方案会同时检查这两种情况。也就是说，安装并启用了应用程序。|offset|length|style|BOLD|2872535|public+static+boolean+isPackageInstalled(String+packageName,+PackageManager+packageManager)+{
+++++try+{
++++++++++return+packageManager.getApplicationInfo(packageName,+0).enabled;
+++++}
+++++catch+(PackageManager.NameNotFoundException+e)+{
++++++++++return+false;
+++++}
}|code-block|syntax|javascript|2872536|调用方法isPackageInstalled()|CODE|2872537|boolean+isAppInstalled+=+isPackageInstalled("com.android.app"+,+this.getPackageManager());|2872538|现在，使用布尔变量isAppInstalled并执行您想要的任何操作。|2872539|if(isAppInstalled+)+{
++++/*+do+whatever+you+want+*/
}|2872540|entityMap^0|0|3|V|0|0|4|K|0|0|9|E|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|12|8|@$D|13|E|14|F|O]]|9|@]|A|$]]|$1|P|3|Q|5|J|7|15|8|@]|9|@]|A|$K|L]]|$1|R|3|S|5|6|7|16|8|@$D|17|E|18|F|O]]|9|@]|A|$]]|$1|T|3|U|5|J|7|19|8|@]|9|@]|A|$K|L]]|$1|V|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|W|$]]

All the answers only check certain app is installed or not. But, as we all know an app can be installed but disabled by the user, unusable.

Therefore, this solution checks for both. i.e, installed AND enabled apps.

<pre><code>public static boolean isPackageInstalled(String packageName, PackageManager packageManager) {
 try {
 return packageManager.getApplicationInfo(packageName, 0).enabled;
 }
 catch (PackageManager.NameNotFoundException e) {
 return false;
 }
}
</code></pre>

Call the method <code>isPackageInstalled()</code>:

<pre><code>boolean isAppInstalled = isPackageInstalled("com.android.app" , this.getPackageManager());
</code></pre>

Now, use the boolean variable <code>isAppInstalled</code> and do whatever you want.

<pre><code>if(isAppInstalled ) {
 /* do whatever you want */
}
</code></pre>

blocks|key|2872542|text|解决其他问题的一个很酷的答案。例如，如果你不想区分"com.myapp.debug“和"com.myapp.release”！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2872543|public+static+boolean+isAppInstalled(final+Context+context,+final+String+packageName)+{
++++final+List<ApplicationInfo>+appsInfo+=+context.getPackageManager().getInstalledApplications(0);
++++for+(final+ApplicationInfo+appInfo+:+appsInfo)+{
++++++++if+(appInfo.packageName.contains(packageName))+return+true;
++++}
++++return+false;
}|code-block|syntax|javascript|2872544|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|$]]

A cool answer to other problems.
If you do not want to differentiate "com.myapp.debug" and "com.myapp.release" for example ! 

<pre><code>public static boolean isAppInstalled(final Context context, final String packageName) {
 final List&lt;ApplicationInfo&gt; appsInfo = context.getPackageManager().getInstalledApplications(0);
 for (final ApplicationInfo appInfo : appsInfo) {
 if (appInfo.packageName.contains(packageName)) return true;
 }
 return false;
}
</code></pre>

blocks|key|224058|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224059|检查应用是否安装在Android中，使用kotlin。|blockquote|224060|224061|224062|正在创建kotlin扩展。|224063|fun+PackageManager.isAppInstalled(packageName:+String):+Boolean+=+try+{
++++++++getApplicationInfo(packageName,+PackageManager.GET_META_DATA)
++++++++true
++++}+catch+(e:+Exception)+{
++++++++false
++++}|code-block|syntax|javascript|224064|现在，可以检查应用程序是否已安装|224065|if+(packageManager.isAppInstalled("AppPackageName"))+{
++++//+App+is+installed
}else{
++++//+App+is+not+installed
}|224066|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|S|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|T|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|U|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|V|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|W|7|@]|8|@]|9|$]]|$1|H|3|I|4|J|6|X|7|@]|8|@]|9|$K|L]]|$1|M|3|N|4|5|6|Y|7|@]|8|@]|9|$]]|$1|O|3|P|4|J|6|Z|7|@]|8|@]|9|$K|L]]|$1|Q|3|-4|4|5|6|10|7|@]|8|@]|9|$]]]|R|$]]

<blockquote>
 Check App is installed or not in Android by using kotlin.
</blockquote>

Creating kotlin extension.

<pre><code>fun PackageManager.isAppInstalled(packageName: String): Boolean = try {
 getApplicationInfo(packageName, PackageManager.GET_META_DATA)
 true
 } catch (e: Exception) {
 false
 }
</code></pre>

Now, can check if app is install or not

<pre><code>if (packageManager.isAppInstalled("AppPackageName")) {
 // App is installed
}else{
 // App is not installed
}
</code></pre>

blocks|key|2872563|text|所以Kotlin+suger更好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2872564|++private+fun+isSomePackageInstalled(context:+Context,+packageName:+String):+Boolean+{

++++val+packageManager+=+context.packageManager

++++return+runCatching+{+packageManager.getPackageInfo(packageName,+0)+}.isSuccess
++}|code-block|syntax|javascript|2872565|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|$]]

So nicer with Kotlin suger:

<pre><code> private fun isSomePackageInstalled(context: Context, packageName: String): Boolean {

 val packageManager = context.packageManager

 return runCatching { packageManager.getPackageInfo(packageName, 0) }.isSuccess
 }
</code></pre>

blocks|key|222067|text|你可以使用Kotlin扩展来实现：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|222068|fun+Context.getInstalledPackages():+List<String>+{
++++val+packagesList+=+mutableListOf<String>()
++++packageManager.getInstalledPackages(0).forEach+{
++++++++if+(+it.applicationInfo.sourceDir.startsWith("/data/app/")+&&+it.versionName+!=+null)
++++++++++++packagesList.add(it.packageName)
++++}
++++return+packagesList
}

fun+Context.isInDevice(packageName:+String):+Boolean+{
++++return+getInstalledPackages().contains(packageName)
}|code-block|syntax|javascript|222069|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|$]]

You can do it using Kotlin extensions :
<pre><code>fun Context.getInstalledPackages(): List&lt;String&gt; {
 val packagesList = mutableListOf&lt;String&gt;()
 packageManager.getInstalledPackages(0).forEach {
 if ( it.applicationInfo.sourceDir.startsWith(&quot;/data/app/&quot;) &amp;&amp; it.versionName != null)
 packagesList.add(it.packageName)
 }
 return packagesList
}

fun Context.isInDevice(packageName: String): Boolean {
 return getInstalledPackages().contains(packageName)
}
</code></pre>

blocks|key|219089|text|安卓11更新|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|219090|您必须在清单中指定您要搜索的确切捆绑包id。|219091|facebook和whatsapp示例：|219092|在上面的清单"application“中(其中的权限是)|219093|<queries>
++++<package+android:name="com.whatsapp"+/>
++++<package+android:name="com.facebook.katana"+/>
</queries>++|code-block|syntax|javascript|219094|这将允许您检查是否安装了facebook和whatsapp，否则检查结果总是为false。|219095|关于这个主题的进一步阅读：|219096|https://medium.com/androiddevelopers/package-visibility-in-android-11-cc857f221cd9|219097|entityMap|0|LINK|mutability|MUTABLE|url^0|0|6|0|0|0|0|0|0|0|0|2A|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|17|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|18|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|19|8|@]|D|@]|E|$O|P]]|$1|Q|3|R|5|6|7|1A|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1B|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1C|8|@]|D|@$9|1D|A|1E|1|1F]]|E|$]]|$1|W|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|V]]]]

Android 11 update 
You have to specofy in the manifest the exact bundle id's you want to search for.
Example for facebook and whatsapp:
Inside the Manifest above &quot;application&quot; (where the permissions are)
<pre><code>&lt;queries&gt;
 &lt;package android:name=&quot;com.whatsapp&quot; /&gt;
 &lt;package android:name=&quot;com.facebook.katana&quot; /&gt;
&lt;/queries&gt; 
</code></pre>
This will allow you to check if facebook and whatsapp are installed, otherwise you will always get false for that check.
Further reading on the subject: 
<a href="https://medium.com/androiddevelopers/package-visibility-in-android-11-cc857f221cd9" rel="nofollow noreferrer">https://medium.com/androiddevelopers/package-visibility-in-android-11-cc857f221cd9</a>

We have installed applications programmatically.

<ol>
<li>If the application is already installed in the device the application is open automatically.</li>
<li>Otherwise install the particular application.</li>
</ol>

Guide Me. I have no idea.
Thanks.

How to check programmatically if an application is installed or not in Android?

Android

Kotlin

我们已经以编程方式安装了应用程序。automatically.Otherwise 如果应用程序已安装在设备中，则打开该应用程序并安装特定的应用程序。指引我。我没有头绪。谢谢。

问如何以编程方式检查应用程序是否已安装在Android中？
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