android - android--如何使用测量getPressure

Question

我对如何使用测量有问题——MotionEvent 的 getPressure。我想测量用户触摸屏幕时施加在屏幕上的压力。任何人都可以给我一些样品左右。

还有一个问题：回归getPressure:1.0是由最强的媒体或设备定义的。

Answer 1

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mPressure = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);// Get an instance of the sensor service, and use that to get an instance of a particular sensor.

public final void onSensorChanged(SensorEvent event) {
float millibars_of_pressure = event.values[0];//use the pressure value
 }

Answer 2

public class MySensorActivity extends Activity implements SensorEventListener{
    private     SensorManager   mSensorManager;
    private     Sensor          mPressure;

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mSensorManager      = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mPressure           = mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);

}

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    @Override
    public void onSensorChanged(SensorEvent event) {
    float millibars_of_pressure = event.values[0];
    Log.e("sensorValues",String.valueOf(millibars_of_pressure));
    }

     @Override
    protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(this, mPressure, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this);
    }
}