[英]Android Gyroscope verse Accelerometer
我正在構建一個Android游戲,我想弄清楚用戶是否向左或向右傾斜設備(類似於當你將人從一側移到另一側時Temple Run的工作方式)。
我已經閱讀了很多教程和示例,並且我制作了示例應用程序,但是從陀螺儀和加速度計中獲取的數據量都是壓倒性的。 我是否需要兩套硬件來確定用戶是否傾斜設備以及在哪個方向?
我目前的應用是檢測每一個輕微的動作,這顯然是不正確的。
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計,只使用陀螺儀還是我需要兩者?
這篇文章鏈接到兩者之間的差異: Android加速度計和陀螺儀
http://diydrones.com/profiles/blogs/faq-whats-the-difference
http://answers.oreilly.com/topic/1751-mobile-accelerometers-and-gyroscopes-explained/
該文檔也將有所幫助: http : //developer.android.com/guide/topics/sensors/sensors_motion.html
根據我非常有限的經驗,陀螺儀不斷測量x,y,z旋轉並不斷更新。 用於在游戲中駕駛汽車/飛機/角色。 加速度計有點像wii-mote,用於擺動或拾取搖動手勢。
根據我使用重力法測量加速度計的經驗,您可以將其用於x,y和z旋轉。 只需輸入谷歌“矢量方法加速度計”。 我使用這種方法用指南針來校正由於傾斜引起的坐標。
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