Android判断小米后台开启界面的权限

        //检查是否已经授予权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            boolean canBackgroundStart = canBackgroundStart(RecipeStartActivity.this);
            if (!canBackgroundStart) {
                MessageDialog.show(RecipeStartActivity.this, "提示", "为了确保您在后台可以正常完成处方任务，需要您允许显示在其他应用上层的权限", "确定")
                        .setonDismissListener(new onDismissListener() {
                            @Override
                            public void onDismiss() {

                            }
                        });
            }
        }


    public static boolean canBackgroundStart(Context context) {
        AppOpsManager ops = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
        int op = 10021; // >= 23
        //ops.checkOpNoThrow(op, Binder.getCallingUid(), context.getPackageName());
        Method method = null;
        try {
            method = ops.getClass().getMethod("checkOpNoThrow", new Class[] {int.class, int.class, String.class} );
            Integer result = (Integer) method.invoke(ops, op, Binder.getCallingUid(), context.getPackageName());
            return result == AppOpsManager.MODE_ALLOWED;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }