WindowManager实现悬浮窗口&可自由移动的悬浮窗口（类似来电通记录流量）
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：
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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：
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<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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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。?
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。?
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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：?
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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。?
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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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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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