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Android处理滑动与点击事件的冲突

Android处理滑动与点击事件的冲突

作者: 因为我的心 | 来源:发表于2020-09-07 11:36 被阅读0次

    一、前言:

    需求:一个ViewGroup中有多个控件,类似于常见的底部Tab布局,这几个子布局之间既可以点击切换,也可以左右滑动切换

    实现:自定义父控件,在onInterceptTouchEvent方法中判断是否点击还是滑动,如果判断是点击,则直接交给child来响应点击事件去;如果是滑动,则

    拦截事件,并通过回调传递给调用者处理。

    优点:该控件只对触摸事件的分发做了相应处理,适用于各种滑动与点击冲突的情况....

    使用:直接将该控件作为父布局即可,通过setmSetOnSlideListener回调处理对应滑动事件

    二、使用:

    1、代码

    import android.content.Context;
    import android.util.AttributeSet;
    import android.view.MotionEvent;
    import android.view.ViewConfiguration;
    import android.widget.RelativeLayout;
    
    public class MyRadioRelativeLayout extends RelativeLayout {
    
        public MyRadioRelativeLayout(Context context) {
            this(context, null);
        }
    
        public MyRadioRelativeLayout(Context context, AttributeSet attrs,
                int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            initView();
        }
    
        public MyRadioRelativeLayout(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
        }
    
        private void initView() {
    
        }
    
        private boolean mScrolling;
        private float touchDownX;
    
        @Override
        public boolean onInterceptTouchEvent(MotionEvent event) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                touchDownX = event.getX();
                mScrolling = false;
                break;
            case MotionEvent.ACTION_MOVE:
                if (Math.abs(touchDownX - event.getX()) >= ViewConfiguration.get(
                        getContext()).getScaledTouchSlop()) {
                    mScrolling = true;
                } else {
                    mScrolling = false;
                }
                break;
            case MotionEvent.ACTION_UP:
                mScrolling = false;
                break;
            }
            return mScrolling;
        }
    
        float x1 = 0;
        float x2 = 0;
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                return true;
            case MotionEvent.ACTION_MOVE:
                
                break;
            case MotionEvent.ACTION_UP:
                x2 = event.getX();
                if (touchDownX - x2 > DensityUtil.dip2px(getContext(), 40)) {
                    if(mSetOnSlideListener!=null){
                        mSetOnSlideListener.onRightToLeftSlide();
                    }
                }
                if (touchDownX - x2 < -DensityUtil.dip2px(getContext(), 40)) {
                    if(mSetOnSlideListener!=null){
                        mSetOnSlideListener.onLeftToRightSlide();
                    }
                }
                break;
            }
    
            return super.onTouchEvent(event);
        }
        
        private setOnSlideListener mSetOnSlideListener;
        
        public setOnSlideListener getmSetOnSlideListener() {
            return mSetOnSlideListener;
        }
    
        public void setmSetOnSlideListener(setOnSlideListener mSetOnSlideListener) {
            this.mSetOnSlideListener = mSetOnSlideListener;
        }
    
        public interface setOnSlideListener{
            void onRightToLeftSlide();
            void onLeftToRightSlide();
        }
    
    }
    

    2、解析:

    ViewConfiguration.getScaledTouchSlop () 用法

    getScaledTouchSlop是一个距离,表示滑动的时候,手的移动要大于这个距离才开始移动控件。如果小于这个距离就不触发移动控件,如viewpager就是用这个距离来判断用户是否翻页。

    ViewConfiguration滑动参数设置类:

    
    /**
    * 包含了方法和标准的常量用来设置UI的超时、大小和距离
    */
    public class ViewConfiguration {
      
        // 设定水平滚动条的宽度和垂直滚动条的高度,单位是像素px
        private static final int SCROLL_BAR_SIZE = 10;
    
        //定义滚动条逐渐消失的时间,单位是毫秒
        private static final int SCROLL_BAR_FADE_DURATION = 250;
    
        // 默认的滚动条多少秒之后消失,单位是毫秒
        private static final int SCROLL_BAR_DEFAULT_DELAY = 300;
    
        // 定义边缘地方褪色的长度
        private static final int FADING_EDGE_LENGTH = 12;
    
        //定义子控件按下状态的持续事件
        private static final int PRESSED_STATE_DURATION = 125;
    
        //定义一个按下状态转变成长按状态的转变时间
        private static final int LONG_PRESS_TIMEOUT = 500;
    
        //定义用户在按住适当按钮,弹出全局的对话框的持续时间
        private static final int GLOBAL_ACTIONS_KEY_TIMEOUT = 500;
    
        //定义一个touch事件中是点击事件还是一个滑动事件所需的时间,如果用户在这个时间之内滑动,那么就认为是一个点击事件
        private static final int TAP_TIMEOUT = 115;
    
        /**
        * Defines the duration in milliseconds we will wait to see if a touch event
        * is a jump tap. If the user does not complete the jump tap within this interval, it is
        * considered to be a tap.
        */
        //定义一个touch事件时候是一个点击事件。如果用户在这个时间内没有完成这个点击,那么就认为是一个点击事件
        private static final int JUMP_TAP_TIMEOUT = 500;
    
        //定义双击事件的间隔时间
        private static final int DOUBLE_TAP_TIMEOUT = 300;
    
        //定义一个缩放控制反馈到用户界面的时间
        private static final int ZOOM_CONTROLS_TIMEOUT = 3000;
    
        /**
        * Inset in pixels to look for touchable content when the user touches the edge of the screen
        */
        private static final int EDGE_SLOP = 12;
    
        /**
        * Distance a touch can wander before we think the user is scrolling in pixels
        */
        private static final int TOUCH_SLOP = 16;
    
        /**
        * Distance a touch can wander before we think the user is attempting a paged scroll
        * (in dips)
        */
        private static final int PAGING_TOUCH_SLOP = TOUCH_SLOP * 2;
    
        /**
        * Distance between the first touch and second touch to still be considered a double tap
        */
        private static final int DOUBLE_TAP_SLOP = 100;
    
        /**
        * Distance a touch needs to be outside of a window's bounds for it to
        * count as outside for purposes of dismissing the window.
        */
        private static final int WINDOW_TOUCH_SLOP = 16;
    
        //用来初始化fling的最小速度,单位是每秒多少像素
        private static final int MINIMUM_FLING_VELOCITY = 50;
    
        //用来初始化fling的最大速度,单位是每秒多少像素
        private static final int MAXIMUM_FLING_VELOCITY = 4000;
    
        //视图绘图缓存的最大尺寸,以字节表示。在ARGB888格式下,这个尺寸应至少等于屏幕的大小
        @Deprecated
        private static final int MAXIMUM_DRAWING_CACHE_SIZE = 320 * 480 * 4; // HVGA screen, ARGB8888
        //flings和scrolls摩擦力度大小的系数
        private static float SCROLL_FRICTION = 0.015f;
    
        /**
        * Max distance to over scroll for edge effects
        */
        private static final int OVERSCROLL_DISTANCE = 0;
    
        /**
        * Max distance to over fling for edge effects
        */
        private static final int OVERFLING_DISTANCE = 4;
    }
    

    转载:https://www.cnblogs.com/liujingg/p/5017127.html

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