How to disable Activity and enable it programmatically?

In this example there are two activities declared in AndroidManifest.xml file. SetupActivity is enabled and MainActivity is disabled by default.

<activity
      android:name=”.SetupActivity”
      android:label=”@string/app_name_setup”
      android:icon=”@drawable/app_setup_icon”
      android:enabled=”true”>
         <intent-filter>
             <action android:name=”android.intent.action.MAIN”/>
             <category android:name=”android.intent.category.LAUNCHER”/>
         </intent-filter>
</activity>
<activity
      android:name=”.MainActivity”
      android:label=”@string/app_name”
      android:icon=”@string/app_icon”
      android:enabled=”false”>
         <intent-filter>
             <action android:name=”android.intent.action.MAIN”/>
             <category android:name=”android.intent.category.LAUNCHER”/>
         </intent-filter>
</activity>

You can enable MainActivity by using following code.

private void toggleActivities() {
     PackageManager packageManager = getPackageManager();
     // Enable the main activity
     packageManager.setComponentEnabledSetting(new ComponentName(this, MainActivity.class),
     PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
     // Disable the setup activity
     packageManager.setComponentEnabledSetting(new ComponentName(this, SetupActivity.class),
     PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
}

Sometimes you have a component, usually a Service, that you don’t want to expose to the rest of the system for security purposes. To do this, you can set the android:exported attribute to false, which will effectively hide that component from the rest of the system.