Android Pressure Sensor

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package zhangphil.sensor;import android.content.Context;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;public class MainActivity extends AppCompatActivity {    private SensorManager mSensorManager;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        startSensor();    }    /**     * 启动传感器。     */    private void startSensor() {        mSensorManager = (SensorManager) this.getSystemService(Context.SENSOR_SERVICE);        Sensor mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);        if (mSensorManager == null || mSensor == null) {            throw new UnsupportedOperationException("设备不支持");        }        boolean isRegister = mSensorManager.registerListener(mSensorEventListener, mSensor, SensorManager.SENSOR_DELAY_NORMAL);        if (!isRegister) {            throw new UnsupportedOperationException();        }    }    private SensorEventListener mSensorEventListener = new SensorEventListener() {        @Override        public void onSensorChanged(SensorEvent sensorEvent) {            if (sensorEvent.sensor.getType() == Sensor.TYPE_PRESSURE) {                /**                 * 传感器返回的压强,单位是百帕。                 */                float pressure = sensorEvent.values[0];                Log.d("压强", String.valueOf(pressure) + "百帕");            }        }        @Override        public void onAccuracyChanged(Sensor sensor, int i) {        }    };    @Override    protected void onDestroy() {        super.onDestroy();        mSensorManager.unregisterListener(mSensorEventListener);    }}
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