实现思路是获取其他应用上层悬浮窗的权限，然后在状态栏的位置写一个状态栏高度的透明view
代码如下
CustomViewGroup view;
WindowManager manager;
/**
* activity启动时调用禁止下拉
*/
private void prohibitDropDown() {
manager = ((WindowManager) getApplicationContext()
.getSystemService(Context.WINDOW_SERVICE));
WindowManager.LayoutParams localLayoutParams = new WindowManager.LayoutParams();
localLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;
localLayoutParams.gravity = Gravity.TOP;
localLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
// this is to enable the notification to recieve touch events
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
// Draws over status bar
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
localLayoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
localLayoutParams.height = (int) (30 * getResources()
.getDisplayMetrics().scaledDensity);
localLayoutParams.format = PixelFormat.TRANSPARENT;
view = new CustomViewGroup(this);
manager.addView(view, localLayoutParams);
}
/**
* activity销毁时允许下拉，不然程序不大退，怎么都无法下拉状态栏
*/
private void allowDropDown() {
manager.removeView(view);
}
6.0以下的直接在AndroidManifest.xml里加
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
6.0以后在AndroidManifest.xml里加了权限以后还要要自己跳转设置
Intent intent1 = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent1, 11);
