如何建立在所有其它窗口的Andr​​oid顶部的窗口 [英] How to build a window on the top of all others window on Android

问题描述

我要建立在每个窗口的顶部视图。

I want to build a view on the top of every window.

我发现这个code：

bt = new Button(getApplicationContext());
LayoutParams param = new LayoutParams();
param.flags = LayoutParams.FLAG_NOT_FOCUSABLE;
param.format = PixelFormat.RGBA_8888;
param.type = LayoutParams.TYPE_SYSTEM_ALERT;
param.gravity = Gravity.TOP | Gravity.LEFT;
param.width = 40;
param.height = 40;
wmgr = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
wmgr.addView(bt, param);

和的manifest.xml ：

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

该视图建立，但是当我preSS home键，我看不到，除了在状态栏任何东西。

The view is built but when I press the home button, I can't see anything except the status bar.

有什么不对？请帮我。

推荐答案

修改

wmgr = (WindowManager) getSystemService(Context.WINDOW_SERVICE); 

要

wmgr = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);

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