Question

我有一个奇怪的错误让我发疯。我正在使用Android Marshmallow，我正在实施新的权限。当我单击“登录”按钮时，我会检查用户是否具有gps权限。如果没有，我请求他们。代码的工作方式是，在询问权限后，调用Async任务以从REST服务获取某些设置，然后在Async任务的onPostExecute上，它将触发Intent。

当用户允许权限时，一切正常。如果用户拒绝权限，它将调用异步任务并调用Intent，但不会激活Intent。它只是停留在屏幕上。

按钮单击

    Button btnLogin = (Button) findViewById(R.id.btnLogin);
    btnLogin.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View view)
        {
            int has_permission = 0;

            if (Build.VERSION.SDK_INT >= 23)
            {
                has_permission = Check_Permission(Manifest.permission.ACCESS_FINE_LOCATION);
            }

            action = "login";

            if(has_permission == 0)
            {
                Get_Location();

                load_system_settings_async = new Load_System_Settings_Async();
                load_system_settings_async.execute((Void) null);
            }
        }
    });

检查权限代码

   protected int Check_Permission(final String permission)
{
    int has_permission = checkSelfPermission(permission);

    if (has_permission != PackageManager.PERMISSION_GRANTED)
    {
        if (!shouldShowRequestPermissionRationale(permission) && (request_times > 0))
        {
            String title="";

            if(permission.equals(Manifest.permission.ACCESS_FINE_LOCATION))
            {
                title = "You need to allow GPS access";
            }
            else if(permission.equals(Manifest.permission.WRITE_EXTERNAL_STORAGE))
            {
                title = "You need to allow storage access";
            }
            else if(permission.equals(Manifest.permission.CALL_PHONE))
            {
                title = "You need to allow access phone access";
            }

            Show_Alert_Dialog("Ok", title,
                    new DialogInterface.OnClickListener()
                    {
                        @Override
                        public void onClick(DialogInterface dialog, int which)
                        {
                            Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
                                    Uri.fromParts("package", getPackageName(), null));
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            startActivity(intent);

                            //requestPermissions(new String[] {permission}, REQUEST_CODE_ASK_PERMISSIONS);
                        }
                    });
            return has_permission;
        }

        requestPermissions(new String[] {permission}, REQUEST_CODE_ASK_PERMISSIONS);
        request_times++;

        return has_permission;
    }

    return has_permission;
}

权限请求

    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
{
    if (requestCode == 123)
    {
        if(grantResults[0] == 0)
        {
            Get_Location();
        }

        load_system_settings_async = new Load_System_Settings_Async();
        load_system_settings_async.execute((Void) null);

        //request_times = 0;
    }
    else
    {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

Answer 1

似乎问题是当用户拒绝权限时，即使未授予权限，控制也会落入执行异步任务的onRequestPermissionsResult。在以下代码中检查注释

public void onRequestPermissionsResult(int requestCode, @NonNull String[] 
permissions, @NonNull int[] grantResults)
{
    if (requestCode == 123) // yes request code is the same go on 
    {
        if(grantResults[0] == 0) //yes we get the approval  
        {
            Get_Location();
        }
         // oh even if we didn't get the approval we still gonna execute the task
        load_system_settings_async = new Load_System_Settings_Async();
        load_system_settings_async.execute((Void) null);

        //request_times = 0;
    }
    else //control only come here when request code will not match 
    {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

你需要像这样结合if条件

if (requestCode == 123 && grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

Answer 2

好吧，我想通了..当我在Intent中传递带有putExtra的自定义对象时，有一个属性为null，所以当它在对象中执行writeToParcel时，它就崩溃了。不幸的是，Android一直在执行而没有崩溃..它只是什么也没做。我只是在对象中添加了一个setter并将值设置为false。问题与权限代码无关。四个小时的生命和失眠，我不会回来。感谢所有观看者。

Android onRequestPermissionsResult无法正常工作

2 个答案: