android 传感器使用与开发---温度传感器

类型：Sensor.TYPE_PROXIMITY

距离感应器，可以感应手机和人体距离

用途：在靠近手机屏幕 某个距离时，发生某事。

比如：点亮或者熄灭屏幕；启动听筒。有时可实现复杂操作，屏幕上方操作屏幕等等。

Code :

/* 根据距离感应器改变AudioManager播放模式 */

public class MainActivity extends Activity implements SensorEventListener {

private AudioManager audioManager;

private SensorManager mSensorManager;

private Sensor mSensor;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

init();

}

private void init() {

audioManager = (AudioManager) this

.getSystemService(Context.AUDIO_SERVICE);

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);

MediaPlayer mPlayer = new MediaPlayer();

try {

mPlayer.reset();

mPlayer.setDataSource(new FileInputStream("/sdcard/snow.mp3").getFD());

mPlayer.prepare();

mPlayer.start();

} catch (IllegalArgumentException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SecurityException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalStateException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

@Override

protected void onResume() {

mSensorManager.registerListener(this, mSensor,

SensorManager.SENSOR_DELAY_NORMAL);

super.onResume();

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

mSensorManager.unregisterListener(this);

super.onPause();

}

@Override

public void onSensorChanged(SensorEvent event) {

// TODO Auto-generated method stub

float range = event.values[0];

if (range == mSensor.getMaximumRange()) {

Toast.makeText(this, "正常模式", Toast.LENGTH_LONG).show();

audioManager.setMode(AudioManager.MODE_NORMAL);

} else {

Toast.makeText(this, "听筒模式", Toast.LENGTH_LONG).show();

audioManager.setMode(AudioManager.MODE_IN_CALL);

}

}

@Override

public void onAccuracyChanged(Sensor sensor, int accuracy) {

// TODO Auto-generated method stub

}

}