Android开发---制作桌面可移动控件

 做android的应该经常会看见桌面上显示歌词，或者流量监控的悬浮窗。今天通过一个简单的实例来学习。

先看看效果。

1. 先建一个top_window.xml。这个就是用来在桌面上显示的控件。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ffffff"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="点我就能移动~"
android:textColor="#000000" />
</LinearLayout> 

2. 建一个类继承自Application

/*
* 主要用到两个类WindowManager, WindowManager.LayoutParams. 对窗口进行管理.
*/
package com.orgcent.desktop;

import android.app.Application;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnTouchListener;

public class BaseAppliction extends Application
{
    WindowManager mWM;
    WindowManager.LayoutParams mWMParams;

    @Override
    public void onCreate()
    {
        mWM = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        final View win = LayoutInflater.from(this).inflate(
                R.layout.top_window, null);

        win.setOnTouchListener(new OnTouchListener()
        {
            float lastX, lastY;

            public boolean onTouch(View v, MotionEvent event)
            {
                final int action = event.getAction();

                float x = event.getX();
                float y = event.getY();
                if (action == MotionEvent.ACTION_DOWN)
                {
                    lastX = x;
                    lastY = y;
                } else if (action == MotionEvent.ACTION_MOVE)
                {
                    mWMParams.x += (int) (x - lastX);
                    mWMParams.y += (int) (y - lastY);
                    mWM.updateViewLayout(win, mWMParams);
                }
                return true;
            }
        });

        WindowManager wm = mWM;
        WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams();
        mWMParams = wmParams;
        wmParams.type = 2002; //type是关键，这里的2002表示系统级窗口，你也可以试试2003。可取查帮助文档
        wmParams.format = 1;
        wmParams.flags = 40;

        wmParams.width = 100;//设定大小
        wmParams.height = 30;

        wm.addView(win, wmParams);
    }
}

其他的不用更改，直接运行即可看到效果。

源码下载: http://download.csdn.net/detail/xn4545945/4510098

转载请注明出处: http://blog.csdn.net/xn4545945