我的程序一次只请求 1 个权限答案

【问题标题】：My program only requests 1 permission at a time我的程序一次只请求 1 个权限
【发布时间】：2018-02-07 20:06:26
【问题描述】：

此程序需要访问相机和位置。但是，当设备需要同时请求两者时，它只请求其中一个权限，并且在我关闭我的程序然后重新打开它之前不会请求另一个。我无法弄清楚这个问题。

protected void requestBoth() {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.CAMERA}, MULT_KEY);
    }

    protected void requestLoc() {
           ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, LOCPERMISSION_KEY);
    }

    protected void requestCam() {
  ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, CAMPERMISSION_KEY);
    }

public void request() {
    if ((ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED)) {
        requestUpdates();
    } else if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
        requestCam();
    } else if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
        requestLoc();
    } else {
        requestBoth();
    }

 }
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (Build.VERSION.SDK_INT >= 23) {
            request();
        }

    }

请有人帮忙！顺便说一句，我故意在这个问题中省略了 shouldShowRequestPermissionsRationale 以及 onRequestPermissionsResult 方法，因为我认为这些与问题无关。（我什至尝试将 request() 调用放在 onResume() 中，但是当权限被拒绝并且用户选中“不再显示”时，这会导致无限循环。我完全没有想法。

【问题讨论】：

找不到此代码的任何问题，您可能需要在其他部分查找问题。您是否从片段的活动中调用它？如果是后者，那么您可能对 FragmentManager 有问题
请显示用户处理权限请求后执行的回调代码。

标签： android android-studio permissions

【解决方案1】：

另一个有效的解决方案是使用 RxJava 和RxPermission

所以你可以这样做：

rxPermissions
    .requestEach(Manifest.permission.CAMERA,
             Manifest.permission.ACCESS_FINE_LOCATION)
    .subscribe(permission -> { // will emit 2 Permission objects
        if (permission.granted) {
           // `permission.name` is granted !
        } else if (permission.shouldShowRequestPermissionRationale) {
           // Denied permission without ask never again
        } else {
           // Denied permission with ask never again
           // Need to go to the settings
        }
    });

或者您可以请求组合的每个权限：

rxPermissions
    .requestEachCombined(Manifest.permission.CAMERA,
             Manifest.permission.ACCESS_FINE_LOCATION)
    .subscribe(permission -> { // will emit 1 Permission object
        if (permission.granted) {
           // All permissions are granted !
        } else if (permission.shouldShowRequestPermissionRationale)
           // At least one denied permission without ask never again
        } else {
           // At least one denied permission with ask never again
           // Need to go to the settings
        }
    });

【讨论】：

【解决方案2】：

使用 Ted 权限：

dependencies {
    compile 'gun0912.ted:tedpermission:2.1.0'
}

制作权限监听器

PermissionListener permissionlistener = new PermissionListener() {
    @Override
    public void onPermissionGranted() {
        Toast.makeText(MainActivity.this, "Permission Granted", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onPermissionDenied(ArrayList<String> deniedPermissions) {
        Toast.makeText(MainActivity.this, "Permission Denied\n" + deniedPermissions.toString(), Toast.LENGTH_SHORT).show();
    }


};

启动 TedPermission

//Change your permission in this section, you can add any number of permissions\\
// You can also check whether user has given the permission or not \\

TedPermission.with(this)
    .setPermissionListener(permissionlistener)
    .setDeniedMessage("If you reject permission,you can not use this service\n\nPlease turn on permissions at [Setting] > [Permission]")
    .setPermissions(Manifest.permission.READ_CONTACTS, Manifest.permission.ACCESS_FINE_LOCATION)
    .check();

希望对你有帮助。

【讨论】：

【解决方案3】：

请求两个权限的方法必须是requestBoth():

protected void requestBoth() {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.CAMERA}, MULT_KEY);
    }

将您的代码更改为：

 if ((ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED)) {
         //requestUpdates();
          requestBoth();

    } 
    ...

【讨论】：

他的那段代码已经验证了这两个权限都被授予了，根本不需要请求任何权限。

【解决方案4】：

现在，您可以像这样将它们全部放在一个字符串数组中

 ActivityCompat.requestPermissions((Activity) Login.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.READ_PHONE_NUMBERS, Manifest.permission.READ_SMS}, 100);

【讨论】：