如何将视图/图像添加到主屏幕?
最好的例子是facebook messenger:如果你长按聊天项目,你可以选择“d出作弊头”,然后你的屏幕上会有一个小按钮.
还有像屏幕破碎机这样的应用程序,来自破碎显示屏的图像覆盖了手机上的所有内容.
我已经搜索过了,但我不知道它叫什么.
我希望你们能够理解我的英语.
解决方法:
答案是SYstem_ALERT_WINDOW,这使你能够在android中绘制任何东西,同样的功能facebook用于绘制其聊天头.
http://developer.android.com/reference/android/Manifest.permission.html#SYSTEM_ALERT_WINDOW
示例代码:
private WindowManager windowManager; private ImageVIEw imageVIEw; // Get window manager reference windowManager = (WindowManager) getSystemService(WINDOW_SERVICE); imageVIEw= new ImageVIEw(YOUR_CONTEXT_HERE); imageVIEw.setimageResource(R.drawable.androID_head); // Setup layout parameter WindowManager.LayoutParams params = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_PHONE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); params.gravity = Gravity.top | Gravity.left; // OrIEntation params.x = 100; // where you want to draw this, coordinates params.y = 100; // At it to window manager for display, it will be printed over any thing windowManager.addVIEw(chathead, params); // Make sure to remove it when you are done, else it will stick there until you reboot // Do keep track of same reference of vIEw you added, don't mess with that windowManager.removeVIEw(imageVIEw);
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