我尝试在片段中使用手势;我在处理我的细节片段的FragmentActivity中有以下代码。我尝试发生的情况是,当在视图上检测到滑动时,将该视图中的数据替换为上一个或下一个条目。
如果有更好的方法来处理这件事,我会全力支持。但是,这里发生的情况是onFling方法从未实际调用过。
public static class DetailsFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
View v = inflater.inflate(R.layout.my_view, null, false);
final GestureDetector gesture = new GestureDetector(getActivity(),
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
final int SWIPE_MIN_DISTANCE = 120;
final int SWIPE_MAX_OFF_PATH = 250;
final int SWIPE_THRESHOLD_VELOCITY = 200;
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Log.i(Constants.APP_TAG, "Right to Left");
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Log.i(Constants.APP_TAG, "Left to Right");
titles.showDetails(getPosition() - 1);
}
} catch (Exception e) {
// nothing
}
return super.onFling(e1, e2, velocityX, velocityY);
}
});
v.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return gesture.onTouchEvent(event);
}
});
return v;
}
}
发布于 2012-07-11 04:39:08
看起来下面的问题解释了这一点:Android: GestureDetector won't catch Gestures
另外,下面是结果:
解决方案实际上是重写onDown方法并返回true;否则手势检测器将停止并且不检测up:
final GestureDetector gesture = new GestureDetector(getActivity(),
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
Log.i(Constants.APP_TAG, "onFling has been called!");
final int SWIPE_MIN_DISTANCE = 120;
final int SWIPE_MAX_OFF_PATH = 250;
final int SWIPE_THRESHOLD_VELOCITY = 200;
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Log.i(Constants.APP_TAG, "Right to Left");
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Log.i(Constants.APP_TAG, "Left to Right");
}
} catch (Exception e) {
// nothing
}
return super.onFling(e1, e2, velocityX, velocityY);
}
});
v.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return gesture.onTouchEvent(event);
}
});
https://stackoverflow.com/questions/11421368
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