How to change vibrate mode to ringer prgrammatically through audio manager

Question

I am making application where phone mode will changes from silent mode to ringer mode if the user sends an sms with some specific keyword. The application mainly works when

Answer 1

To make it work for android devices for and above Marshmallow(API 23)

1. In AndroidManifest.xml define the ACCESS_NOTIFICATION_POLICY permission

2. In your onResume/onCreate function ask for permission if not granted

   @Override
   protected void onResume() {
       super.onResume();
       NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
       //Check if the phone is running Marshmallow or above
       if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M) {
           //If the permission is not granted, launch an inbuilt activity to grant permission
           if (!nm.isNotificationPolicyAccessGranted()) {
               startActivity(new Intent(Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS));
           }
       }
   }
   

3. Finally to change Ringer mode call this method

   public void setRingerMode(Context context,int mode){
           /*
           * mode variable value can be:
           * AudioManager.RINGER_MODE_SILENT
           * AudioManager.RINGER_MODE_NORMAL
           * AudioManager.RINGER_MODE_VIBRATE
           */
           NotificationManager nm = (NotificationManager)context.getSystemService(NOTIFICATION_SERVICE);
           AudioManager audioManager = (AudioManager)context.getSystemService(AUDIO_SERVICE);
           if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M && nm.isNotificationPolicyAccessGranted())
               audioManager.setRingerMode(mode);
       }