Android FloatWindow

package com.zms.floatwindow;

import android.app.Activity;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.view.Gravity;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;

public class Main extends Activity {

    private WindowManager wm = null;
    private WindowManager.LayoutParams wmParams = null;
    private MyFloatView myFV = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.main);
        createView();
    }

    private void createView() {
        myFV = new MyFloatView(getApplicationContext());
        myFV.setImageResource(R.drawable.ic_launcher);
        //获取WindowManager
        wm = (WindowManager) getApplicationContext().getSystemService("window");
        //设置LayoutParams(全局变量）相关参数
        wmParams = ((MyApplication) getApplication()).getMywmParams();

        /**
         *以下都是WindowManager.LayoutParams的相关属性
         * 具体用途可参考SDK文档
         */
        wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;   //设置window type
        wmParams.format = PixelFormat.RGBA_8888;   //设置图片格式，效果为背景透明

        //设置Window flag
        wmParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
                | LayoutParams.FLAG_NOT_FOCUSABLE;
        /*
         * 下面的flags属性的效果形同“锁定”。
         * 悬浮窗不可触摸，不接受任何事件,同时不影响后面的事件响应。
         wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
                               | LayoutParams.FLAG_NOT_FOCUSABLE
                               | LayoutParams.FLAG_NOT_TOUCHABLE;
        */

        wmParams.gravity = Gravity.LEFT | Gravity.TOP;   //调整悬浮窗口至左上角
        //以屏幕左上角为原点，设置x、y初始值
        wmParams.x = 0;
        wmParams.y = 0;

        //设置悬浮窗口长宽数据
        wmParams.width = 40;
        wmParams.height = 40;

        //显示myFloatView图像
        wm.addView(myFV, wmParams);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        //在程序退出(Activity销毁）时销毁悬浮窗口
        wm.removeView(myFV);
    }

    @Override
    protected void onRestart() {
        wm.removeView(myFV);
        super.onRestart();
    }

    @Override
    protected void onStop() {
        //创建悬浮窗口
        //createView();
        super.onStop();
    }
}

package com.zms.floatwindow;

import android.content.Context;
import android.util.Log;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.widget.ImageView;

/**
 * Created by AlexZhou on 2015/3/27.
 * 20:58
 */
public class MyFloatView extends ImageView {
    private float mTouchStartX;
    private float mTouchStartY;
    private float x;
    private float y;

    private WindowManager wm = (WindowManager) getContext().getApplicationContext()
            .getSystemService("window");

    //此wmParams为获取的全局变量，用以保存悬浮窗口的属性
    private WindowManager.LayoutParams wmParams = ((MyApplication) getContext().getApplicationContext())
            .getMywmParams();

    public MyFloatView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        //getRawX()获取相对屏幕的坐标，即以屏幕左上角为原点
        x = event.getRawX();
        y = event.getRawY() - 25;   //25是系统状态栏的高度
        Log.i("currP", "currX" + x + "====currY" + y);
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                //getX()获取相对View的坐标，即以此View左上角为原点
                mTouchStartX = event.getX();
                mTouchStartY = event.getY();

                Log.i("startP", "startX" + mTouchStartX + "====startY" + mTouchStartY);

                break;
            case MotionEvent.ACTION_MOVE:
                updateViewPosition();
                break;

            case MotionEvent.ACTION_UP:
                updateViewPosition();
                mTouchStartX = mTouchStartY = 0;
                break;
        }
        return true;
    }

    private void updateViewPosition() {
        //更新浮动窗口位置参数,x是鼠标在屏幕的位置，mTouchStartX是鼠标在图片的位置
        wmParams.x = (int) (x - mTouchStartX);
        System.out.println(mTouchStartX);
        wmParams.y = (int) (y - mTouchStartY);
        wm.updateViewLayout(this, wmParams);
    }

}