如何将视图/图像添加到我的主屏幕?
最好的例子是facebook messenger:如果你长时间点击聊天项目,你可以选择“弹出作弊头”,然后你的屏幕上会出现一个小按钮。
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。
答案 0 :(得分:9)
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);