android - 我的程序一次只请求 1 个权限

Question

此程序需要访问相机和位置。但是，当设备需要同时请求这两种权限时，它只会请求其中一个权限，而不会请求另一个权限，直到我关闭我的程序然后重新打开它。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();
        }

    }

有人帮忙啊!顺便说一句，我故意从这个问题中排除了 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。

Answer 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
        }
    });