WindowManager实现悬浮窗口&可自由移动的悬浮窗口

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Android桌面悬浮窗效果实现,仿360手机卫士悬浮窗效果
http://www.verydemo.com/demo_c89_i41511.html

Android中悬浮窗口的实现原理和示例代码
http://www.xsmile.net/?p=404

调用WindowManager,并设置WindowManager.LayoutParams的相关属性,通过WindowManager的addView方法创建View,这样产生出来的View根据WindowManager.LayoutParams属性不同,效果也就不同了。比如创建系统顶级窗口,实现悬浮窗口效果!

WindowManager的方法很简单,基本用到的就三个addView,removeView,updateViewLayout。

而WindowManager.LayoutParams的属性就多了,非常丰富,具体请查看SDK文档。这里给出Android中的WindowManager.java源码,可以具体看一下。
WindowManager 的源码地址:
http://www.netmite.com/android/mydroid/frameworks/base/core/java/android/view/WindowManager.java

以下代码请仅供演示:
    public class myFloatView extends Activity { 
        /** Called when the activity is first created. */ 
        @Override 
        public void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.main); 
            Button bb=new Button(getApplicationContext()); 
            WindowManager wm=(WindowManager)getApplicationContext().getSystemService("window"); 
            WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams(); 
            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。 
            wmParams.format=1; 
            /**
             *这里的flags也很关键
             *代码实际是wmParams.flags |= FLAG_NOT_FOCUSABLE;
             *40的由来是wmParams的默认属性(32)+ FLAG_NOT_FOCUSABLE(8)
             */ 
            wmParams.flags=40; 
            wmParams.width=40; 
            wmParams.height=40; 
            wm.addView(bb, wmParams);//创建View 
        } 
    } 

PS:本代码在Android2.3下测试无错(从API Level来看,实际上android1.5都可行)!另外别忘了在AndroidManifest.xml文件中加入如下权限:
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> 

关于代码中wmParams.type的值的问题,下面给出一些数值参考:
         /**
         * Window type: the status bar.  There can be only one status bar
         * window; it is placed at the top of the screen, and all other
         * windows are shifted down so they are below it.
         */
        public static final int TYPE_STATUS_BAR         = FIRST_SYSTEM_WINDOW;
        /**
         * Window type: the search bar.  There can be only one search bar
         * window; it is placed at the top of the screen.
         */
        public static final int TYPE_SEARCH_BAR         = FIRST_SYSTEM_WINDOW+1;
        /**
         * Window type: phone.  These are non-application windows providing
         * user interaction with the phone (in particular incoming calls).
         * These windows are normally placed above all applications, but behind
         * the status bar.
         */
        public static final int TYPE_PHONE              = FIRST_SYSTEM_WINDOW+2;
        /**
         * Window type: system window, such as low power alert. These windows
         * are always on top of application windows.
         */
        public static final int TYPE_SYSTEM_ALERT       = FIRST_SYSTEM_WINDOW+3;
        /**
         * Window type: keyguard window.
         */
        public static final int TYPE_KEYGUARD           = FIRST_SYSTEM_WINDOW+4;
        /**
         * Window type: transient notifications.
         */
        public static final int TYPE_TOAST              = FIRST_SYSTEM_WINDOW+5;
        /**
         * Window type: system overlay windows, which need to be displayed
         * on top of everything else.  These windows must not take input
         * focus, or they will interfere with the keyguard.
         */
        public static final int TYPE_SYSTEM_OVERLAY     = FIRST_SYSTEM_WINDOW+6;
        /**
         * Window type: priority phone UI, which needs to be displayed even if
         * the keyguard is active.  These windows must not take input
         * focus, or they will interfere with the keyguard.
         */
        public static final int TYPE_PRIORITY_PHONE     = FIRST_SYSTEM_WINDOW+7;
        /**
         * Window type: panel that slides out from the status bar
         */
        public static final int TYPE_STATUS_BAR_PANEL   = FIRST_SYSTEM_WINDOW+8;
        /**
         * Window type: panel that slides out from the status bar
         */
        public static final int TYPE_SYSTEM_DIALOG      = FIRST_SYSTEM_WINDOW+8;
        /**
         * Window type: dialogs that the keyguard shows
         */
        public static final int TYPE_KEYGUARD_DIALOG    = FIRST_SYSTEM_WINDOW+9;
        /**
         * Window type: internal system error windows, appear on top of
         * everything they can.
         */
        public static final int TYPE_SYSTEM_ERROR       = FIRST_SYSTEM_WINDOW+10;
        /**
         * End of types of system windows.
         */
        public static final int LAST_SYSTEM_WINDOW      = 2999;

———————————
这个FIRST_SYSTEM_WINDOW的值就是2000。2003和2002的区别就在于2003类型的View比2002类型的还要top,能显示在系统下拉状态栏之上!

    可以看出来,2002的值的含义其实就是2000+2。数值2000的含义就是系统级窗口,2002和2003的区别就是 2003 比 2002还要更上一层!比如,type为2003的view,能显示在手机下拉状态栏之上!

而关于flags等其他的属性请参考SDK文档

Android悬浮窗体
http://www.xsmile.net/?p=396
Android中悬浮窗口的实现原理和示例代码
http://www.xsmile.net/?p=404

Android中可自由移动悬浮窗口的Demo
http://www.xsmile.net/?p=452
前段时间捣鼓出Android悬浮窗口的实现,今天抽空写了一个可自由移动悬浮窗口的Demo。

image_thumb[2]

简要说明如下:

1、通过覆写悬浮View中onTouchEvent方法实现自由移动悬浮窗口。

2、悬浮窗口坐标的移动实际是windowMananager.LayoutParams中x和y的变换,但是要注意设置相应的gravity。

3、用windowManager创建的View,当不需要时,务必记住使用windowManager的removeView方法来移除,请在Activity相关生命周期中自行添加扫尾工作。

4、代码中已经附上详细注释。有关参数具体含义,请自行参考SDK。

===============================

注意Demo中wmParams.format=1的属性(我源码中打了双斜杠),如果启用,图片背景将会透明,效果图如下:

image_thumb[1][1]

================================

一些说明:

对于种种原因没有查看SDK文档的一些朋友,可能对我源码中wmParams.type=2002这样的语句不太了解其2002的具体意义,给出可读性好点的语句。

如下:
    wmParams.type=LayoutParams.TYPE_PHONE;  
           //wmParams.format=PixelFormat.RGBA_8888;   //设置图片格式,效果为背景透明 
           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;
           */ 



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