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/