Starting from Android 3.1, the system's package manager keeps track of applications that are in a stopped state and provides a means of controlling their launch from background processes and other applications.

Note that an application's stopped state is not the same as an Activity's stopped state. The system manages those two stopped states separately.

Note that the system adds FLAG_EXCLUDE_STOPPED_PACKAGES to all broadcast intents. It does this to prevent broadcasts from background services from inadvertently or unnecessarily launching components of stoppped applications. A background service or application can override this behavior by adding the FLAG_INCLUDE_STOPPED_PACKAGES flag to broadcast intents that should be allowed to activate stopped applications.

public class MyReceiver extends BroadcastReceiver {
 
	@Override
	public void onReceive(Context context, Intent intent) {
		String action = intent.getAction();
		String localPkgName = context.getPackageName();//取得MyReceiver所在的App的包名
		Uri data = intent.getData();
		String installedPkgName = data.getSchemeSpecificPart();//取得安裝的Apk的包名，只在該app覆蓋安裝后自啟動
		if((action.equals(Intent.ACTION_PACKAGE_ADDED)
				|| action.equals(Intent.ACTION_PACKAGE_REPLACED)) && installedPkgName.equals(localPkgName)){
			Intent launchIntent = new Intent(context,MainActivity.class);
			launchIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			context.startActivity(launchIntent);
		}
	}
}

<application
  android:allowBackup="true"
  android:icon="@drawable/ic_launcher"
  android:label="@string/app_name"
  android:theme="@style/AppTheme" >
  <activity
   android:name="com.example.mydemo.MainActivity"
  	android:configChanges="orientation|keyboard"
   android:label="@string/app_name">
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
  <receiver android:name="com.example.mydemo.MyReceiver">
   <intent-filter>
    <action android:name="android.intent.action.PACKAGE_ADDED" /> 
    <action android:name="android.intent.action.PACKAGE_REPLACED" />
    <action android:name="android.intent.action.PACKAGE_REMOVED" />
    <data android:scheme="package"/>
   </intent-filter>
  </receiver>
 </application>