How to launch an Activity from another Application in Android

It is possible to start an app's activity by using [`Intent.setClassName`][1] according to the docs.

An example:
```kotlin
val activityName = "com.google.android.apps.muzei.MuzeiActivity" // target activity name
val packageName = "net.nurik.roman.muzei" // target package's name
val intent = Intent().setClassName(packageName, activityName)
startActivity(intent)
```

To open it outside the current app, add this flag before starting the intent.

```kotlin
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
```

A related answer [here](

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)

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**Edit depending on comment**

In some versions - as suggested in comments - the exception thrown may be different.

Thus the solution below is slightly modified


Intent launchIntent = null;
try{
launchIntent = getPackageManager().getLaunchIntentForPackage("applicationId");
} catch (Exception ignored) {}

if(launchIntent == null){
startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("https://play.google.com/store/apps/details?id=" + "applicationId")));
} else {
startActivity(launchIntent);
}


**Original Answer**

Although answered well, there is a pretty simple implementation that handles if the app is not installed. I do it like this

try{
startActivity(getPackageManager().getLaunchIntentForPackage("applicationId"));
} catch (PackageManager.NameNotFoundException e) {
startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("https://play.google.com/store/apps/details?id=" + "applicationId")));
}

Replace "applicationId" with the package that you want to open such as com.google.maps, etc.

Try code below:

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setComponent(new ComponentName("package_name", "Class_name"));
if (intent.resolveActivity(getPackageManager()) != null)
{
startActivity(intent);
}

In Kotlin

fun openApplicationOrMarket(packageName: String) {
var intent = requireContext().packageManager.getLaunchIntentForPackage(packageName)
if (intent == null) {
intent = Intent(Intent.ACTION_VIEW)
intent.data = Uri.parse("market://details?id=$packageName")
}

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
requireContext().startActivity(intent)
}

Since kotlin is becoming very popular these days, I think it's appropriate to provide a simple solution in Kotlin as well.
```kotlin
var launchIntent: Intent? = null
try {
launchIntent = packageManager.getLaunchIntentForPackage("applicationId")
} catch (ignored: Exception) {
}
if (launchIntent == null) {
startActivity(Intent(Intent.ACTION_VIEW).setData(Uri.parse("https://play.google.com/store/apps/details?id=" + "applicationId")))
} else {
startActivity(launchIntent)
}
```

Pass the package name and the message you want to show if package isn't installed ;-)
```java
void openApp(String appPackageName,String message){
Intent launchIntent = getPackageManager().getLaunchIntentForPackage(appPackageName);
if (launchIntent != null) {
startActivity(launchIntent);
} else {
Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + appPackageName)));
}
}
```

Starting from API 30 (Android 11) you can receive nullpointerexception with launchIntentForPackage

val launchIntent: Intent? = activity.packageManager.getLaunchIntentForPackage("com.google.android.gm")
startActivity(launchIntent)
To avoid this you need to add the needed package to the manifest

<queries>
<package android:name="com.google.android.gm" />
</queries>

Here is documentation

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And the medium article

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This will cover all scenarios

1.Get intent for package

2.If intent is null redirect user to playstore

3.If there is an issue with open playstore, then it opens on the default browser.

var intent = activity!!.packageManager.getLaunchIntentForPackage("com.google.android.youtube")

if (intent == null) {
if (intent == null) {
intent = try {
Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=com.google.android.youtube"))
} catch (e: Exception) {
Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=com.google.android.youtube"))
}
}
startActivity(intent)

For Android 11 (API level 30) or higher, in AndroidManifest.xml,

<queries>
<package android:name="com.google.android.youtube" />
<package android:name="com.example.app" />
</queries>

Or simply we can allow for all packages (not recommended)

<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" tools:ignore="QueryAllPackagesPermission" />

References

[Package visibility filtering on Android][1]

[Declaring package visibility needs][2]


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Check for the app, avoiding any crashes. If the app exists in the phone then it will be launched, otherwise it will search in Google Play. If no Google Play app installed in the phone, it will search in the Google Play Store via browser:

public void onLunchAnotherApp() {
final String appPackageName = getApplicationContext().getPackageName();

Intent intent = getPackageManager().getLaunchIntentForPackage(appPackageName);
if (intent != null) {
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
onGoToAnotherInAppStore(intent, appPackageName);
}
}

public void onGoToAnotherInAppStore(Intent intent, String appPackageName) {
try {
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + appPackageName));
startActivity(intent);
} catch (android.content.ActivityNotFoundException anfe) {
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("http://play.google.com/store/apps/details?id=" + appPackageName));
startActivity(intent);
}
}