我已经制作了一个安卓应用程序,使用加速度计在震动时播放下一首歌曲。
现在我想要我的应用程序如果在右边摇动手机,它应该播放下一首歌曲,或者如果在左边摇动,播放前一首,如果可能的话,我可以用摇动动作时找到的轴逻辑来做吗
我怎样才能把轴放在运动检测的方法中,来知道移动设备被震动的方向。如果有人有这个逻辑,请帮助我困在这里。

最佳答案

我做了一些深入的研究,并能自己解决它。但当我发布答案时,巴兹尔的解释比我的实现更好。所以,我觉得它更有帮助。
他做了什么
在onsensorchanged中,每当设备收到新值时,它会在一段延迟后将值存储到变量中。之后,将新值与以前的值进行漂亮的比较。从而计算出设备震动的方向。如果答案还不清楚,请告诉我。

public class ShakeActivity extends Activity implements SensorListener {
// For shake motion detection.
private SensorManager sensorMgr;
private long lastUpdate = -1;
private float x, y, z;
private float last_x, last_y, last_z;
private static final int SHAKE_THRESHOLD = 800;

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

setContentView(R.layout.main);
// start motion detection
sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);
boolean accelSupported = sensorMgr.registerListener(this,
    SensorManager.SENSOR_ACCELEROMETER,
    SensorManager.SENSOR_DELAY_GAME);

    if (!accelSupported) {
        // on accelerometer on this device
        sensorMgr.unregisterListener(this,
                SensorManager.SENSOR_ACCELEROMETER);
    }
}

protected void onPause() {
    if (sensorMgr != null) {
        sensorMgr.unregisterListener(this,
                SensorManager.SENSOR_ACCELEROMETER);
        sensorMgr = null;
    }
    super.onPause();
}

public void onAccuracyChanged(int arg0, int arg1) {
// TODO Auto-generated method stub
}

public void onSensorChanged(int sensor, float[] values) {
    if (sensor == SensorManager.SENSOR_ACCELEROMETER) {
        long curTime = System.currentTimeMillis();
        // only allow one update every 100ms.
        if ((curTime - lastUpdate) > 100) {
        long diffTime = (curTime - lastUpdate);
        lastUpdate = curTime;

        x = values[SensorManager.DATA_X];
        y = values[SensorManager.DATA_Y];
        z = values[SensorManager.DATA_Z];

        if(Round(x,4)>10.0000){
            Log.d("sensor", "X Right axis: " + x);
            Toast.makeText(this, "Right shake detected", Toast.LENGTH_SHORT).show();
        }
        else if(Round(x,4)<-10.0000){
            Log.d("sensor", "X Left axis: " + x);
            Toast.makeText(this, "Left shake detected", Toast.LENGTH_SHORT).show();
        }

        float speed = Math.abs(x+y+z - last_x - last_y - last_z) / diffTime * 10000;

        // Log.d("sensor", "diff: " + diffTime + " - speed: " + speed);
        if (speed > SHAKE_THRESHOLD) {
            //Log.d("sensor", "shake detected w/ speed: " + speed);
            //Toast.makeText(this, "shake detected w/ speed: " + speed, Toast.LENGTH_SHORT).show();
        }
        last_x = x;
        last_y = y;
        last_z = z;
        }
    }
}

public static float Round(float Rval, int Rpl) {
float p = (float)Math.pow(10,Rpl);
Rval = Rval * p;
float tmp = Math.round(Rval);
return (float)tmp/p;
}
}

关于android - 使用震动 Action 从加速度计获取方向,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/48841066/

10-10 15:27