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I have an app which requires data cleaning to work better again.
I am clearing data using,
((ActivityManager)MainActivity.this.getSystemService(ACTIVITY_SERVICE))
.clearApplicationUserData();
But cannot restart the app. I tried adding intent after clearing data. But since the app closes after clearing data. I think that code is unreachable.
((ActivityManager)MainActivity.this.getSystemService(ACTIVITY_SERVICE)).clearApplicationUserData(); Toast.makeText(MainActivity.this,"Reloading...",Toast.LENGTH_SHORT).show();
startActivity(new Intent(MainActivity.this,MainActivity.class));
finish();

Create new ApplicationClass like below
public class ApplicationClass extends Application {
private static ApplicationClass instance;
#Override
public void onCreate() {
super.onCreate();
instance = this;
}
public static ApplicationClass getInstance() {
return instance;
}
}
Add Application class to Application tag of manifest
android:name=".ApplicationClass"
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:name=".ApplicationClass"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
And use this code for clearing data
Intent intent = new Intent(MainActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
| Intent.FLAG_ACTIVITY_CLEAR_TASK
| Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(ApplicationClass.getInstance().getBaseContext(), 0, intent, PendingIntent.FLAG_ONE_SHOT);
AlarmManager mgr = (AlarmManager) ApplicationClass.getInstance().getBaseContext().getSystemService(Context.ALARM_SERVICE);
mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, pendingIntent);
System.exit(2);
((ActivityManager)MainActivity.this.getSystemService(ACTIVITY_SERVICE)).clearApplicationUserData();

After calling clearApplication data, application is killed.Thats why MainActivity doesn't called.

For Clear cache try reference link
Try below code for restart app
Intent i = getBaseContext().getPackageManager()
.getLaunchIntentForPackage( getBaseContext().getPackageName() );
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
Note: If you use clear the app data app doesn't restart. You have to restart it again manually.