Android——距离传感器（PROXIMITY）的应用

public class MainActivity extends Activity {
private TextView tv;
private Sensor sensor;
private SensorManager sm;
private SensorEventListener listener;
private int count;
private Vibrator vibrator;
private int mx,my,mz;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView) findViewById(R.id.tv);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
sm.unregisterListener(listener);
}
public void juli(View v)
{//获得传感器服务
sm=(SensorManager) getSystemService(Context.SENSOR_SERVICE);
//获得距离传感器
sensor=sm.getDefaultSensor(Sensor.TYPE_PROXIMITY);
listener=new SensorEventListener() {

@Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
//获得距离传感器中的数值，这里只有一个距离
float juli[]=event.values;
int distance=(int) juli[0];
//与默认距离比较
if(distance<sensor.getMaximumRange())
{
count++;
tv.setText(count+"");
}
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub

}
};
sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
}

}