About phone RingMode problem

This is the level of your phone when muted, otherwise transferred back to the original ring pattern. But now becomes mute after not coming back, I do not know why.

 
package com.example.test; 

import android.media.AudioManager; 
import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 

import android.hardware.Sensor; 
import android.hardware.SensorEvent; 
import android.hardware.SensorEventListener; 
import android.hardware.SensorManager; 
import android.os.Bundle; 
import android.app.Activity; 
import android.content.Context; 
import android.view.Menu; 

public class MainActivity extends Activity {

private SensorManager sensorMgr = null; 

private float x, y, z; 
private int originalRingMode = -1; 
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 

sensorMgr = (SensorManager) getSystemService (SENSOR_SERVICE); 
Sensor sensor = sensorMgr.getDefaultSensor (Sensor.TYPE_ACCELEROMETER); 
final AudioManager audiomanager = (AudioManager) getSystemService (Context.AUDIO_SERVICE); 
originalRingMode = audiomanager.getRingerMode (); 
SensorEventListener lsn = new SensorEventListener () {
public void onSensorChanged (SensorEvent e) {
x = e.values ​​[SensorManager.DATA_X]; 
y = e.values ​​[SensorManager.DATA_Y]; 
z = e.values ​​[SensorManager.DATA_Z]; 
setTitle ("x =" + x + "," + "y =" + (int) y + "," + "z =" + (int) z); 

if ((int) z == 9 | | (int) z == 10) 
/ / Here we can ignore, because the phone sometimes less, and so the z == 9 or 10 
audiomanager.setRingerMode (AudioManager.RINGER_MODE_SILENT); 
else 
{
audiomanager.setRingerMode (originalRingMode); 

} 
} 
public void onAccuracyChanged (Sensor s, int accuracy) {
} 

}; 
/ / Register the listener, the third parameter is the detection accuracy 
sensorMgr.registerListener (lsn, sensor, 
SensorManager.SENSOR_DELAY_GAME); 
} 

@ Override 
public boolean onCreateOptionsMenu (Menu menu) {
/ / Inflate the menu; this adds items to the action bar if it is present 
.getMenuInflater () inflate (R.menu.main, menu);. 
return true; 
} 

} 

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Nobody knows? These are the code, we help busy.
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