Android之距离传感器控制手机屏幕熄灭的方法

public class MainActivity extends Activity implements SensorEventListener{ public static final String TAG = "SensorTest"; private SensorManager sensorManager; private TextView tv; private PowerManager localPowerManager = null;// 电源管理对象 private WakeLock localWakeLock = null;// 电源锁 @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);  tv = (TextView) findViewById(R.id.tv);  localPowerManager = (PowerManager) getSystemService(POWER_SERVICE);  // 获取PowerManager.WakeLock对象,后面的参数|表示同时传入两个值,最后的是LogCat里用的Tag  localWakeLock = this.localPowerManager.newWakeLock(32, "hahaha");// 第一个参数为电源锁级别，第二个是日志tag } @Override protected void onResume() {  sensorManager.registerListener(this,    sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY),    SensorManager.SENSOR_DELAY_UI);  super.onResume(); } @Override protected void onPause() {  sensorManager.unregisterListener(this);  super.onPause(); } @Override public void onSensorChanged(SensorEvent event) {  // TODO Auto-generated method stub  float[] values = event.values;  switch (event.sensor.getType()) {  case Sensor.TYPE_PROXIMITY:   tv.setText(values[0] + "");   if (values[0] == 0.0) {// 贴近手机    System.out.println("hands up");    Log.d(TAG, "hands up in calling activity");    if (localWakeLock.isHeld()) {     return;    } else {     localWakeLock.acquire();// 申请设备电源锁    }   } else {// 远离手机    System.out.println("hands moved");    Log.d(TAG, "hands moved in calling activity");    if (localWakeLock.isHeld()) {     return;    } else {     localWakeLock.setReferenceCounted(false);     localWakeLock.release(); // 释放设备电源锁    }    break;   }  } } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) {  // TODO Auto-generated method stub }}

<uses-permission android:name="android.permission.DEVICE_POWER"/><uses-permission android:name="android.permission.WAKE_LOCK"/>