Android处理滑动与点击事件的冲突

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