【发布时间】：2012-08-21 20:31:05
【问题描述】：
我正在构建一个 Android 游戏，我想弄清楚用户是向左还是向右倾斜设备（类似于 Temple Run 的工作原理，当您将人左右移动时）。
我阅读了许多教程和示例，并制作了示例应用程序，但我从陀螺仪和加速度计返回的数据量非常庞大。我是否需要两组硬件来确定用户是否倾斜设备以及向哪个方向倾斜？
我当前的应用程序正在检测每一个轻微的动作，这显然是不正确的。
public class Main extends Activity {
private SensorManager mSensorManager;
private float mAccel; // acceleration apart from gravity
private float mAccelCurrent; // current acceleration including gravity
private float mAccelLast; // last acceleration including gravity
private RelativeLayout background;
private Boolean isleft = true;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.background = (RelativeLayout) findViewById(R.id.RelativeLayout1);
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
mAccel = 0.00f;
mAccelCurrent = SensorManager.GRAVITY_EARTH;
mAccelLast = SensorManager.GRAVITY_EARTH;
/* float x1, x2, y1, y2;
String direction;
switch(event.getAction()) {
case(MotionEvent.ACTION_DOWN):
x1 = event.getX();
y1 = event.getY();
break;
case(MotionEvent.ACTION_UP) {
x2 = event.getX();
y2 = event.getY();
float dx = x2-x1;
float dy = y2-y1;
// Use dx and dy to determine the direction
if(Math.abs(dx) > Math.abs(dy)) {
if(dx>0) directiion = "right";
else direction = "left";
} else {
if(dy>0) direction = "down";
else direction = "up";
}
}
}*/
}
private final SensorEventListener mSensorListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
if((mAccelLast<mAccelCurrent)&&(isleft == true)){
background.setBackgroundResource(R.drawable.bg_right);
isleft = false;
}
if((mAccelLast>mAccelCurrent)&&(isleft == false)){
background.setBackgroundResource(R.drawable.bg_left);
isleft = true;
}
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
Log.d("FB", "delta : "+delta);
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
// Log.d("FB", "mAccel : "+mAccel);
}
我最好只使用加速度计，只使用陀螺仪还是两者都需要？
【问题讨论】：
标签： android accelerometer gyroscope motion-detection