WindowManager实现悬浮窗口&可自由移动的悬浮窗口

推荐安卓开发神器（里面有各种UI特效和android代码库实例）

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。
WindowManager实现悬浮窗口&可自由移动的悬浮窗口
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：

WindowManager实现悬浮窗口&可自由移动的悬浮窗口
================================

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。

 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;        */

附Demo源码：

Android中悬浮窗口
http://www.cnblogs.com/GnagWang/archive/2011/02/06/1949569.html

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