Android restart app after clearing cache and data

I have an app which requires data cleaning to work better again. I am clearing data using this,

((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();