getRingerMode - Get the Current Ringtone Mode (Normal, Silent, Vibrate)

getRingerMode was added in API Level 1
Returns: The current ringtone mode, one of RINGER_MODE_NORMAL, RINGER_MODE_SILENT, or RINGER_MODE_VIBRATE.

1. Initialize an AudioManager Variable named myAudioManager.

2. Set an integer variable named myInteger to mAudioManager.getRingerMode. This will save the ringer mode to a variable named myInteger.

3. In the MainActivity.java file, add the following code the onCreate method. 

if (myInteger == AudioManager.RINGER_MODE_NORMAL) {
    // add a toast that displays "Ringer is set to normal"

} else { (if (myInteger == AudioManager.RINGER_MODE_SILENT) {
        // add a toast that displays "Ringer is set to Silient"
    } else {

        if (myInteger == AudioManager.RINGER_MODE_VIBRATE) {
             // add a toast that displays "Ringer is set to Vibrate"
        }

3. Compile and run!

Next Recommended Article: Set Ringer to Vibrate

Resources:
http://developer.android.com/reference/android/media/AudioManager.html#getRingerMode()