Default SMS app OnResume

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 @Override
 protected void onResume() {
     super.onResume();
     final String myPackageName = getPackageName();
     if (Telephony.Sms.getDefaultSmsPackage(getApplicationContext()) == null){
         startActivity(new Intent(this, HomeActivity.class));
         finish();
     }else {
         if (!Telephony.Sms.getDefaultSmsPackage(getApplicationContext()).equals(myPackageName)) {
             // App is not default.
             // Show the "not currently set as the default SMS app" interface
             // Set up a button that allows the user to change the default SMS app
             Button button = findViewById(R.id.bt_set_default);
             button.setOnClickListener(new View.OnClickListener() {
                 public void onClick(View v) {
                     Intent intent = new Intent(Telephony.Sms.Intents.ACTION_CHANGE_DEFAULT);
                     intent.putExtra(Telephony.Sms.Intents.EXTRA_PACKAGE_NAME, myPackageName);
                     startActivity(intent);
                 }
             });
         } else {
             // App is the default.
             // Hide the "not currently set as the default SMS app" interface
             startActivity(new Intent(this, HomeActivity.class));
             finish();
         }
     }
 }
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