以重绘状态栏，遮盖状态栏为例：java

一、设置 WindowManager.LayoutParams 属性android

public static WindowManager.LayoutParams getStatusViewParams(Context ctx, WindowManager mWindowManager) {

//反射状态栏高度

int actionBarHight = 0;

int resourceId = ctx.getResources().getIdentifier("status_bar_height", "dimen", "android");

if (resourceId > 0) {

actionBarHight = ctx.getResources().getDimensionPixelSize(resourceId);

}

// 设置LayoutParams(全局变量)相关参数

WindowManager.LayoutParams mStatusBarParams = new WindowManager.LayoutParams();

//TYPE_SYSTEM_ERROR 须要控件获取焦点时才须要 TYPE_SYSTEM_OVERLAY

mStatusBarParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;

mStatusBarParams.format = PixelFormat.RGBA_8888;

mStatusBarParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_FULLSCREEN

| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;

mStatusBarParams.gravity = Gravity.CENTER | 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

mStatusBarParams.x = 0;

mStatusBarParams.y = 0;

// 设置悬浮窗口长宽数据

mStatusBarParams.width = mWindowManager.getDefaultDisplay().getWidth();

mStatusBarParams.height = actionBarHight;

//设置加载动画

mStatusBarParams.windowAnimations=android.R.style.Animation_Translucent;

Log.e(TAG,"width："+mStatusBarParams.width +"\nheight:" + mStatusBarParams.height );

return mStatusBarParams;

}

须要重点注意 ：WindowManager.LayoutParams的type属性app

TYPE_SYSTEM_ERROR 须要控件获取焦点时才须要(例以下拉、点击事件等);

TYPE_SYSTEM_OVERLAY 不能够获取焦点；

TYPE_TOAST 不须要权限显示悬浮窗；从4.4开始, 使用TYPE_TOAST的同时还能够接收触摸事件和按键事件了, 而4.4之前只能显示出来, 不能交互.

二、添加、修改、移除悬浮窗方法动画

addView、updateViewLayout、removeView

三、附注ui

1)悬浮窗添加流程：code

WindowManager.addView -> ViewRootImpl.setView -> WindowSession.addToDisplay(AIDL进行IPC) -> WindowManagerService.addWindow() -> ViewRootImpl.setVieworm

2)反射通知栏操做：事件

public static void OpenNotify(Context ctx) {

// TODO Auto-generated method stub

int currentApiVersion = android.os.Build.VERSION.SDK_INT;

try {

Object service = ctx.getSystemService("statusbar");

Class> statusbarManager = Class

.forName("android.app.StatusBarManager");

Method expand = null;

if (service != null) {

if (currentApiVersion <= 16) {

expand = statusbarManager.getMethod("expand");

} else {

expand = statusbarManager

.getMethod("expandNotificationsPanel");

}

expand.setAccessible(true);

expand.invoke(service);

}

} catch (Exception e) {

}

}