安卓PopupWindow的拖动实现

安卓PopupWindow的拖动实现

源码：

package com.example.popwindowdemo;


import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

public class PopSmallWindow extends LinearLayout {

    /**
     * 图标起始位置
     */
    private static int imageX = 0;
    private static int imageY = 500;
    private static PopupWindow popWindow;
    private static boolean isPoped = false;  //是否弹出了窗口

    public PopSmallWindow(Context context) {
        super(context);
    }

    public static void initSmallWindow(){
        if (isPoped == false){
            isPoped = true;
            View gh_View = LayoutInflater.from(MainActivity.mContext).inflate(R.layout.gh_layout, null, false);
            //1.构造一个PopupWindow，参数依次是加载的View，宽高
            popWindow = new PopupWindow(gh_View,
                    ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, false);
            popWindow.setTouchable(true);
            popWindow.setTouchInterceptor(new FloatingOnTouchListener()); //设置可拖动
            popWindow.setBackgroundDrawable(MainActivity.mContext.getResources().getDrawable(R.color.transparent));  //设置背景 （transparent是自定义的透明颜色 #00000000）

            // 设置好参数之后再show
            popWindow.showAtLocation(gh_View, Gravity.TOP | Gravity.LEFT,imageX,imageY);
        }
    }

    public static void dismiss(){
        if (popWindow != null && isPoped == true){
            isPoped =false;
            popWindow.dismiss();
        }
    }

    private static class FloatingOnTouchListener implements View.OnTouchListener {
        private int x;
        private int y;
        private int downX;
        private int downY;

        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:  //按下
                    x = (int) event.getRawX();
                    y = (int) event.getRawY();
                    downX = (int) event.getRawX();
                    downY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:  //移动
                    int nowX = (int) event.getRawX();
                    int nowY = (int) event.getRawY();
                    int movedX = nowX - x;
                    int movedY = nowY - y;
                    x = nowX;
                    y = nowY;
                    imageX = imageX + movedX;
                    imageY = imageY + movedY;
                    popWindow.update(imageX,imageY,-1,-1); // -1 应该是代表忽略
                    break;
                case MotionEvent.ACTION_UP:  //单击事件
                    int upX = (int) event.getRawX();
                    int upY = (int) event.getRawY();
                    if (downX == upX && downY == upY) {
                       new PopBigWindow(MainActivity.mContext);
                    }
                    break;
                default:
                    break;
            }
            return false;
        }
    }
}