android 悬浮窗

以重绘状态栏，遮盖状态栏为例：

1、设置 WindowManager.LayoutParams 属性

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 需要控件获取焦点时才需要 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; }

需要重点注意 ：WindowManager.LayoutParams的type属性

TYPE_SYSTEM_ERROR 需要控件获取焦点时才需要(例如下拉、点击事件等); TYPE_SYSTEM_OVERLAY 不可以获取焦点； TYPE_TOAST 不需要权限显示悬浮窗；从4.4开始, 使用TYPE_TOAST的同时还可以接收触摸事件和按键事件了, 而4.4以前只能显示出来, 不能交互.

2、添加、修改、移除悬浮窗方法

addView、updateViewLayout、removeView

3、附注

1）悬浮窗添加流程：

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

2）反射通知栏操作：

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) { } }