Android环境传感器开发教程

Android平台支持以下环境传感器：

TYPE_AMBIENT_TEMPERATURE。

TYPE_LIGHT。

TYPE_PRESSURE。

TYPE_RELATIVE_HUMIDITY。

TYPE_TEMPERATURE。

以下示例代码演示了用压力传感器测量大气压的方法。其他环境传感器的使用方法相同，这里不再一一描述(请参考运动传感器教程):

public class SensorActivity extends Activity implements SensorEventListener {

private SensorManager mSensorManager;

private Sensor mPressure;

@Override

public final void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// Get an instance of the sensor service, and use that to get an instance of

// a particular sensor.

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

mPressure = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);

}

@Override

public final void onAccuracyChanged(Sensor sensor, int accuracy) {

// Do something here if sensor accuracy changes.

}

@Override

public final void onSensorChanged(SensorEvent event) {

float millibars_of_pressure = event.values[0];

// Do something with this sensor data.

}

@Override

protected void onResume() {

// Register a listener for the sensor, super.onResume();

mSensorManager.registerListener(this, mPressure, SensorManager.SENSOR_DELAY_NORMAL)

}

@Override

protected void onPause() {

// Be sure to unregister the sensor when the activity pauses.

super.onPause();

mSensorManager.unregisterListener(this);

}

}