你也可以在dispatchTouchEvent
中插入一个调用来处理touchevent
,但在这种情况下,你还必须重写onTouchEvent
并返回true,否则手势的第一个MotionEvent
DOWN将被传递。
这是可触摸包装容器:
<?xml version="1.0" encoding="utf-8"?>
<view xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.example.myapp.FragmentContainer$TouchableWrapper" />
而这个类:
public static class TouchableWrapper extends FrameLayout {
private GestureDetector gestureDetector;
public void setGestureDetector(GestureDetector gestureDetector) {
this.gestureDetector = gestureDetector;
}
public TouchableWrapper(Context context) {
super(context);
}
public TouchableWrapper(Context context, AttributeSet attrs) {
super(context, attrs);
}
public TouchableWrapper(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
Log.d(TAG, "onInterceptTouchEvent " + event.toString());
return false;
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
Log.d(TAG, "dispatchTouchEvent " + event.toString());
gestureDetector.onTouchEvent(event);
return super.dispatchTouchEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
Log.d(TAG, "onTouchEvent " + event.toString());
return true;
}
}
这是 GestureDetector
的参考文档:
private GestureDetector gestureDetector;
这是 GestureListener
:
private GestureDetector.SimpleOnGestureListener sOGL = new GestureDetector.SimpleOnGestureListener() {
private static final int SWIPE_THRESHOLD = 100;
private static final int SWIPE_VELOCITY_THRESHOLD = 100;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
boolean result = false;
try {
float diffY = e2.getY() - e1.getY();
float diffX = e2.getX() - e1.getX();
if (Math.abs(diffX) > Math.abs(diffY)) {
if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (diffX > 0) {
goToRight();
} else {
goToLeft();
}
}
result = true;
} else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
if (diffY > 0) {
} else {
}
}
result = true;
} catch (Exception exception) {
exception.printStackTrace();
}
return result;
}
};
加载可点击容器片段和包含的片段:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.d(TAG, "onCreateView()");
View view = inflater.inflate(R.layout.fragmentcontainer, container, false);
gestureDetector = new GestureDetector(view.getContext(), sOGL);
((FragmentContainer.TouchableWrapper) view).setGestureDetector(gestureDetector);
FragmentManager fm = this.getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.pager, frag).commit();
return view;
}