我想在屏幕的一个屏幕中检测到运动.我正在使用以下代码.
public class MyinfoActivity extends Activity implements OnGestureListener {
@Override
public void onCreate(Bundle savedInstanceState) {
..........
..........
gestureScanner = new GestureDetector(this);
resBlock = (TableRow) findViewById(R.id.ResBlock);
gestureScanner = new GestureDetector(this);
}
@Override
public boolean onTouchEvent(MotionEvent me){
Log.d(null,"Touch");
if (gestureScanner.onTouchEvent(me))
return gestureScanner.onTouchEvent(me);
else
return false;
}
@Override
public boolean onFling(MotionEvent e1,MotionEvent e2,float velocityX,float velocityY) {
Log.d(null,"Fling");
............
............
}
@Override
public boolean onDown(MotionEvent arg0) {
return false;
}
@Override
public void onLongPress(MotionEvent e) {}
@Override
public boolean onScroll(MotionEvent e1,float distanceX,float distanceY) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
}
它正在检测到TouchEvent,但它并没有检测到任何甩动.我的代码有什么问题？
解决方法
我使用以下代码解决了这个问题.
public class MyinfoActivity extends Activity {
private GestureDetector gestureScanner;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.myinfotrackerinner);
gestureScanner = new GestureDetector(this,simpleOnGestureListener);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return gestureScanner.onTouchEvent(event);
}
GestureDetector.SimpleOnGestureListener simpleOnGestureListener =
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDown(MotionEvent event) {
return true;
}
@Override
public boolean onFling(MotionEvent event1,MotionEvent event2,float velocityY) {
Log.d(null,"Fling");
int dx = (int) (event2.getX() - event1.getX());
// don't accept the fling if it's too short
// as it may conflict with a button push
if (Math.abs(dx) > MAJOR_MOVE
&& Math.abs(velocityX) > Math.abs(velocityY)) {
if (velocityX > 0) {
moveGraph("L");
} else {
moveGraph("R");
}
return true;
} else {
return false;
}
}
};
}
