工具是一个FrameLayout，用的时候把需要实现拖拽的view放进去就可以了。

没有事件冲突的问题。

package com.reone.loushi.customView;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.WindowManager;import android.widget.FrameLayout;/** * Created by wangxingsheng on 2017/1/15. * */public class DragLayout extends FrameLayout {    private int lastX;    private int lastY;    private int screenWidth;    private int screenHeight;    public DragLayout(Context context) {        super(context);        init();    }    public DragLayout(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public DragLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    public void init() {        WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);        screenWidth = wm.getDefaultDisplay().getWidth();        screenHeight = wm.getDefaultDisplay().getHeight();    }    @Override    public boolean dispatchTouchEvent(MotionEvent event) {        int ea = event.getAction();            switch (ea) {                case MotionEvent.ACTION_DOWN:                    lastX = (int) event.getRawX();                    lastY = (int) event.getRawY();//按钮初始的横纵坐标                    break;                case MotionEvent.ACTION_MOVE:                    int dx = (int) event.getRawX()-lastX;                    int dy = (int) event.getRawY()-lastY;//按钮被移动的距离                    int l = getLeft()+dx;                    int b = getBottom()+dy;                    int r = getRight()+dx;                    int t = getTop()+dy;                    if(l<0){//处理按钮被移动到上下左右四个边缘时的情况，决定着按钮不会被移动到屏幕外边去                        l = 0;                        r = l+getWidth();                    }                    if(t<0){                        t = 0;                        b = t+getHeight();                    }                    if(r>screenWidth){                        r = screenWidth;                        l = r - getWidth();                    }                    if(b>screenHeight){                        b = screenHeight;                        t = b-getHeight();                    }                    layout(l, t, r, b);                    lastX = (int) event.getRawX();                    lastY = (int) event.getRawY();                    postInvalidate();                    break;                default:                    break;            }        return super.dispatchTouchEvent(event);    }}

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