Question

我遇到了registerListener的问题。我的应用程序崩溃，我不知道如何正确编写registerListener。我从互联网上拿了一些代码。实际上来自这个网站。这是我的代码：

public class FullscreenActivity extends Activity {

 // Start with some variables
private SensorManager sensorMan;
private Sensor accelerometer;

private float[] mGravity;
private float mAccel;
private float mAccelCurrent;
private float mAccelLast;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_fullscreen);

    if (Build.VERSION.SDK_INT < 16) {
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }

    // In onCreate method
    sensorMan = (SensorManager)getSystemService(SENSOR_SERVICE);
    accelerometer = sensorMan.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    mAccel = 0.00f;
    mAccelCurrent = SensorManager.GRAVITY_EARTH;
    mAccelLast = SensorManager.GRAVITY_EARTH;                                
}         

    @Override
public void onResume() {
    super.onResume();
    sensorMan.registerListener((SensorEventListener)this, accelerometer,SensorManager.SENSOR_DELAY_UI);
}

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

    public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
        mGravity = event.values.clone();
        // Shake detection
        float x = mGravity[0];
        float y = mGravity[1];
        float z = mGravity[2];
        mAccelLast = mAccelCurrent;
        mAccelCurrent = FloatMath.sqrt(x*x + y*y + z*z);
        float delta = mAccelCurrent - mAccelLast;
        mAccel = mAccel * 0.9f + delta;
            // Make this higher or lower according to how much
            // motion you want to detect
        if(mAccel > 3){ 
        // do something
        }
    }

}

public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // required method
}

}

结果应用程序崩溃了。

Answer 1

您尝试将(SensorEventListener)转换为Activity类型，您将获得需要实施的强制转换

SensorEventListener in your `Activity`

试试这个

public class FullscreenActivity extends Activity implements SensorEventListener

Android检测运动 - registerListener应用程序崩溃

1 个答案: