كيف تحويل الجوال من صامت الى عام والعكس ؟؟

public void changePhoneMode(int mode)
{
AudioManager am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
am.setRingerMode(mode);
}

public void checkPhoneMode()
{
AudioManager am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

switch (am.getRingerMode()) {
case AudioManager.RINGER_MODE_SILENT:
Toast.makeText(this,"SILENT",Toast.LENGTH_LONG).show();
break;
case AudioManager.RINGER_MODE_VIBRATE:
Toast.makeText(this,"VIBRATE",Toast.LENGTH_LONG).show();
break;
case AudioManager.RINGER_MODE_NORMAL:
Toast.makeText(this,"NORMAL",Toast.LENGTH_LONG).show();
break;
}
}