Android-ViewFlipper的滑动与子视图中item点击的冲突解决

来源：互联网发布：redis与mysql的区别编辑：程序博客网时间：2024/05/22 01:49

场景：ViewFlipper中添加了几个View，每个View中有几条itemView，每个itemView设置了setOnClickListener，ViewFlipper中通过GestureDetector来控制左右翻页效果。

问题：不滑动，点击每个itemView，运行正常，当触发了滑动后，手势抬起时，依然会执行itemView的click事件

解决：在继承的ViewFlipper中，拦截手势动作onInterceptTouchEvent来拦截MotionEvent.ACTION_UP动作，如果正在处理滑动，直接返回true，不再下发，放置触发itemView的点击事件，下面给出ViewFlipper的代码，里面有注释

package com.custom.views.carousel;import android.content.Context;import android.util.AttributeSet;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.TranslateAnimation;import android.widget.ViewFlipper;import java.util.ArrayList;import java.util.List;/** * Created by menghui on 2017/10/23. */public class JRJCarouselFlipper extends ViewFlipper {    /**     * 视图切换监听     */    public interface CarouselChanged{        void onChanged(int oldIndex,int newIndex,View view);    }    private Animation rightInAnim,leftOutAnim,rightOutAnim,leftInAnim;    private List<View> views;    private CarouselChanged carouselChanged;    //动画周期    private int duration = 500;    private GestureDetector gestureDetector;    private GestureDetector.OnGestureListener gestureListener;    //是否滑动中，该标志用来避免gesture的滑动和滑动View中item的点击冲突    private boolean fling = false;    public JRJCarouselFlipper(Context context) {        super(context);        init(context);    }    public JRJCarouselFlipper(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);    }    private void init(Context ctx){        gestureListener = new GestureDetector.OnGestureListener() {            @Override            public boolean onDown(MotionEvent e) {                fling = false;                return false;            }            @Override            public void onShowPress(MotionEvent e) {            }            @Override            public boolean onSingleTapUp(MotionEvent e) {                return false;            }            @Override            public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {                return false;            }            @Override            public void onLongPress(MotionEvent e) {            }            @Override            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {                fling = true;                if (e1.getX() - e2.getX() > 100) {                    setInAnimation(rightInAnim);                    setOutAnimation(leftOutAnim);                    int old = getDisplayedChild();                    showNext();                    int newindex = getDisplayedChild();                    triggerChanged(old,newindex);                    return true;                } else if (e1.getX() - e2.getX() < -100) {                    setInAnimation(leftInAnim);                    setOutAnimation(rightOutAnim);                        int old = getDisplayedChild();                        showPrevious();                        int newindex = getDisplayedChild();                        triggerChanged(old,newindex);                    return true;                }                return false;            }        };        gestureDetector = new GestureDetector(gestureListener);        views = new ArrayList<>();        // 图片从右侧滑入        rightInAnim = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 1.0f,                Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 0.0f);        rightInAnim.setDuration(duration);        // 图片从左侧滑出        leftOutAnim = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, -1.0f,                Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 0.0f);        leftOutAnim.setDuration(duration);        // 图片从右侧滑出        rightOutAnim = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 1.0f,                Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 0.0f);        rightOutAnim.setDuration(duration);        // 图片从左侧滑入        leftInAnim = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -1.0f,                Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 0.0f,                Animation.RELATIVE_TO_PARENT, 0.0f);        leftInAnim.setDuration(duration);    }    private void triggerChanged(int oldIndex,int newIndex){        if (views.size() <= 0)            return;        if (carouselChanged != null){            carouselChanged.onChanged(oldIndex,newIndex,views.get(newIndex));        }    }    public CarouselChanged getCarouselChanged() {        return carouselChanged;    }    public void setCarouselChanged(CarouselChanged carouselChanged) {        this.carouselChanged = carouselChanged;    }    /**     * 设置要轮播的视图列表     * @param views     */    public void setViews(List<View> views) {        this.views.clear();        this.removeAllViews();        this.views.addAll(views);        for(View v:views){            this.addView(v);        }    }    /**     * 拦截触屏，当按下时，fling=false，允许点击子视图中的item，当手势抬起时，为避免和滑动发生冲突，判断fling状态，     * 如果处于滑动中，并且是手势抬起，返回true，不再向下传递，使item点击事件失效     * @param ev     * @return     */    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        if (ev.getAction() == MotionEvent.ACTION_DOWN)            fling = false;        else if (fling && ev.getAction() == MotionEvent.ACTION_UP){            return true;        }        return super.onInterceptTouchEvent(ev);    }    /**     * 分发触屏，交给gesture     * @param ev     * @return     */    @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        gestureDetector.onTouchEvent(ev);        return super.dispatchTouchEvent(ev);    }}

阅读全文

0 0