How to Start Activity in Another Application

How to start activity in another application?

If you guys are facing "Permission Denial: starting Intent..." error or if the app is getting crash without any reason during launching the app - Then use this single line code in Manifest

android:exported="true"

Please be careful with finish(); , if you missed out it the app getting frozen. if its mentioned the app would be a smooth launcher.

finish();

The other solution only works for two activities that are in the same application. In my case, application B doesn't know class com.example.MyExampleActivity.class in the code, so compile will fail.

I searched on the web and found something like this below, and it works well.

Intent intent = new Intent();
intent.setComponent(new ComponentName("com.example", "com.example.MyExampleActivity"));
startActivity(intent);

You can also use the setClassName method:

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setClassName("com.hotfoot.rapid.adani.wheeler.android", "com.hotfoot.rapid.adani.wheeler.android.view.activities.MainActivity");
startActivity(intent);
finish();

You can also pass the values from one app to another app :

Intent launchIntent = getApplicationContext().getPackageManager().getLaunchIntentForPackage("com.hotfoot.rapid.adani.wheeler.android.LoginActivity");
if (launchIntent != null) {
    launchIntent.putExtra("AppID", "MY-CHILD-APP1");
    launchIntent.putExtra("UserID", "MY-APP");
    launchIntent.putExtra("Password", "MY-PASSWORD");
    startActivity(launchIntent);
    finish();
} else {
    Toast.makeText(getApplicationContext(), " launch Intent not available", Toast.LENGTH_SHORT).show();
}

How to launch an Activity from another Application in Android 30

Android 11 added restrictions regarding the visibility of other apps. Apps that have targetSdk set to >= 30 can't interact with and open other apps without specifying this in the manifest.

To specify that your app interacts with another specific app, you need to add a <queries> element to your manifest file:

<manifest package="com.example.game">
    <queries>
        <package android:name="com.android.audioapp" />
    </queries>
    ...
</manifest>

The link below contains other examples in case you need to specify a broader range of apps which you want to interact with.

Source: https://developer.android.com/training/basics/intents/package-visibility

Launch Activity from another Application Android

What you need to use are intent-filters. Assume the activity to be launched is in the package launch.me. Inside this applications manifest all the activities (main or otherwise) will be decalred by the <activity> tag.

Assuming the activity you want to launch is inside the class file Launchme. Then a portion of your manifest will be something like:

<activity android:name="launch.me.Launchme"
              android:label="@string/app_name">
<intent-filter>
            <action android:name="launch.me.action.LAUNCH_IT"/>
            <category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>  

Now in the activity from where you want to launch the above activity use:(Note: This activity can be in any package anywhere. You have to make sure that both, the calling and the called packages are available on the device)

Intent i=new Intent();
i.setAction("launch.me.action.LAUNCH_IT");
startActivityForResult(i,0);

You can use other methods for starting the intent other than startActivityForResult, thats upto you.

Starting a non-Main Activity from other app clearing its top

After a lot of research and tries, I've found that adding the next parameter to the activity in the manifest works like a charm. I hope this can help someone else:

android:launchMode="singleInstance"

How do I launch a specific (explicit) activity of another app

Try this:

Intent intent = new Intent();
intent.setClassName("com.pas.webcam.pro", "com.pas.webcam.Rolling");
startActivity(intent);

Since you refer to the app as "IP webcam pro", I'm assuming the package name is "com.pas.webcam.pro" (found by Internet research).

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