在现实生活中，打电话的时候手机挨着自己的头，屏幕会熄灭，是吧，这是为了不让自己的头按到什么手机键~这个功能可以使用距离传感器来实现
代码如下：
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
}
}
仔细想想，是不是屏幕熄灭的时候需要手机自带的电源~
所以需要加上权限：
<uses-permission Android:name="android.permission.DEVICE_POWER"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
本文源码可以到Linux公社资源站下载：
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具体下载目录在 /2018年资料/4月/10日/Android通过距离传感器控制手机屏幕熄灭/
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