• Android环境传感器开发教程

    Android平台支持的环境传感器有如下几种:

    • TYPE_AMBIENT_TEMPERATURE。
    • TYPE_LIGHT。
    • TYPE_PRESSURE。
    • TYPE_RELATIVE_HUMIDITY。
    • TYPE_TEMPERATURE。

    下列示例代码演示了使用压力传感器测量大气气压的方法,其他环境传感器的使用方法相同,在此不再一一描述(可参考《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);
        }
    }

更多...

加载中...