解决Android弹出Dialog小米手机需要打开“后台弹出界面”的权限问题

在Application中添加以下代码并调用：

private boolean isAllowed() {AppOpsManager ops = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);try {int op = 10021;Method method = ops.getClass().getMethod("checkOpNoThrow", new Class[]{int.class, int.class, String.class});Integer result = (Integer) method.invoke(ops, op, Process.myUid(), getPackageName());return result == AppOpsManager.MODE_ALLOWED;} catch (Exception e) {Log.e("===", "not support");}return false;}