自动获取权限

写demo的时候，老是申请各种权限烦人，写了种根据manifest自动申请的代码

private void handlerPermissions(Activity activity) {
        PackageManager pm = activity.getPackageManager();
        PackageInfo pi;
        List<String> allPermissionList = new ArrayList<>();
        List<String> noPermissionList = new ArrayList<>();
        try {
            pi = pm.getPackageInfo(activity.getPackageName(), PackageManager.GET_PERMISSIONS);
            String[] permissions = pi.requestedPermissions;
            allPermissionList = Arrays.asList(permissions);
        } catch (PackageManager.NameNotFoundException e) {
            Log.e("", "get permissions failed", e);
        }

        for (String permission : allPermissionList) {
            if (ContextCompat.checkSelfPermission(activity, permission) != PackageManager.PERMISSION_GRANTED) {
                noPermissionList.add(permission);
            }
        }

        if (noPermissionList.size() > 0) {
            ActivityCompat.requestPermissions(activity, noPermissionList.toArray(new String[noPermissionList.size()]), 1);
        }

    }