public class MainActivity extends Activity implements SensorEventListener{ public static final String TAG = "SensorTest"; private SensorManager sensorManager; private TextView tv; private PowerManager localPowerManager = null;// 電源管理對(duì)象 private WakeLock localWakeLock = null;// 電源鎖 @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);  // 獲取PowerManager.WakeLock對(duì)象,后面的參數(shù)|表示同時(shí)傳入兩個(gè)值,最后的是LogCat里用的Tag  localWakeLock = this.localPowerManager.newWakeLock(32, "hahaha");// 第一個(gè)參數(shù)為電源鎖級(jí)別，第二個(gè)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) {// 貼近手機(jī)    System.out.println("hands up");    Log.d(TAG, "hands up in calling activity");    if (localWakeLock.isHeld()) {     return;    } else {     localWakeLock.acquire();// 申請(qǐng)?jiān)O(shè)備電源鎖    }   } else {// 遠(yuǎn)離手機(jī)    System.out.println("hands moved");    Log.d(TAG, "hands moved in calling activity");    if (localWakeLock.isHeld()) {     return;    } else {     localWakeLock.setReferenceCounted(false);     localWakeLock.release(); // 釋放設(shè)備電源鎖    }    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"/>