Question

开发Android运行时权限。我做了所有的部分。但是我对一件事感到沮丧。

我想知道具体的许可已被拒绝，从不再问过。

当我们在下面调用API

时，我们肯定能得到结果

 ActivityCompat.requestPermissions(this, PERMISSIONS_CONTACT, REQUEST_CONTACTS);

我们可以在这里得到结果

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
        @NonNull int[] grantResults) {

    if (requestCode == REQUEST_CAMERA) {
         // here we can get the result
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

但是我的需求是没有请求requestPermissions（this，PERMISSIONS_CONTACT，REQUEST_CONTACTS）; API 我想找到状态永远不再问是否检查

如果有人知道的话请分享。

Answer 1

但是我的需求是没有请求requestPermissions（this，PERMISSIONS_CONTACT，REQUEST_CONTACTS）; API我想找到状态永远不再询问是否检查

这将很难。

您可以在shouldShowRequestPermissionRationale()上致电ActivityCompat。这将返回true if：

您之前已向用户请求此权限
用户拒绝了该权限
用户未选中了“不再询问”复选框

您可以在checkSelfPermission()上致电ContextCompat。这将返回true if：

您之前已向用户请求此权限
用户授予该权限

您还可以跟踪自己之前是否曾向用户请求此权限，例如将该信息存储在SharedPreferences中。

如果：

您知道之前已经（通过SharedPreferences）和
checkSelfPermission()返回false（因此用户未授予权限），
shouldShowRequestPermissionRationale()返回false（因此您不应向用户提供理由）

然后许可是在“不再问”状态。

Answer 2

我有同样的问题，我想出来了。为了简化生活，我编写了一个util类来处理运行时权限。

public class PermissionUtil {
    /*
    * Check if version is marshmallow and above.
    * Used in deciding to ask runtime permission
    * */
    public static boolean shouldAskPermission() {
        return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M);
    }
private static boolean shouldAskPermission(Context context, String permission){
        if (shouldAskPermission()) {
            int permissionResult = ActivityCompat.checkSelfPermission(context, permission);
            if (permissionResult != PackageManager.PERMISSION_GRANTED) {
                return true;
            }
        }
        return false;
    }
public static void checkPermission(Context context, String permission, PermissionAskListener listener){
/*
        * If permission is not granted
        * */
        if (shouldAskPermission(context, permission)){
/*
            * If permission denied previously
            * */
            if (context.shouldShowRequestPermissionRationale(permission)) {
                listener.onPermissionPreviouslyDenied();
            } else {
                /*
                * Permission denied or first time requested
                * */
if (PreferencesUtil.isFirstTimeAskingPermission(context, permission)) {
                    PreferencesUtil.firstTimeAskingPermission(context, permission, false);
                    listener.onPermissionAsk();
                } else {
                    /*
                    * Handle the feature without permission or ask user to manually allow permission
                    * */
                    listener.onPermissionDisabled();
                }
            }
        } else {
            listener.onPermissionGranted();
        }
    }
/*
    * Callback on various cases on checking permission
    *
    * 1.  Below M, runtime permission not needed. In that case onPermissionGranted() would be called.
    *     If permission is already granted, onPermissionGranted() would be called.
    *
    * 2.  Above M, if the permission is being asked first time onPermissionAsk() would be called.
    *
    * 3.  Above M, if the permission is previously asked but not granted, onPermissionPreviouslyDenied()
    *     would be called.
    *
    * 4.  Above M, if the permission is disabled by device policy or the user checked "Never ask again"
    *     check box on previous request permission, onPermissionDisabled() would be called.
    * */
    public interface PermissionAskListener {
/*
        * Callback to ask permission
        * */
        void onPermissionAsk();
/*
        * Callback on permission denied
        * */
        void onPermissionPreviouslyDenied();
/*
        * Callback on permission "Never show again" checked and denied
        * */
        void onPermissionDisabled();
/*
        * Callback on permission granted
        * */
        void onPermissionGranted();
    }
}

PreferenceUtil 方法如下。

public static void firstTimeAskingPermission(Context context, String permission, boolean isFirstTime){
SharedPreferences sharedPreference = context.getSharedPreferences(PREFS_FILE_NAME, MODE_PRIVATE;
 sharedPreference.edit().putBoolean(permission, isFirstTime).apply();
 }
public static boolean isFirstTimeAskingPermission(Context context, String permission){
return context.getSharedPreferences(PREFS_FILE_NAME, MODE_PRIVATE).getBoolean(permission, true);
}

现在，您只需要使用方法* checkPermission *和适当的参数。

这是一个例子，

PermissionUtil.checkPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    new PermissionUtil.PermissionAskListener() {
                        @Override
                        public void onPermissionAsk() {
                            ActivityCompat.requestPermissions(
                                    thisActivity,
              new String[]{Manifest.permission.READ_CONTACTS},
                            REQUEST_EXTERNAL_STORAGE
                            );
                        }
@Override
                        public void onPermissionPreviouslyDenied() {
                       //show a dialog explaining permission and then request permission
                        }
@Override
                        public void onPermissionDisabled() {
Toast.makeText(context, "Permission Disabled.", Toast.LENGTH_SHORT).show();
                        }
@Override
                        public void onPermissionGranted() {
                            readContacts();
                        }
                    });

我想知道具体的许可已被拒绝，从不再问过。

如果用户选中从不再询问，您将在 onPermissionDisabled 上获得回电。

快乐编码：）

Android M运行时权限

2 个答案: