Android上的异常“打开失败:EACCES(权限被拒绝)”

我得到了

open failed: EACCES(权限被拒绝)

myOutput = new FileOutputStream(outFileName);

我检查了根目录，并尝试了android.permission.WRITE_EXTERNAL_STORAGE。

我该如何解决这个问题?

try {
    InputStream myInput;

    myInput = getAssets().open("XXX.db");

    // Path to the just created empty db
    String outFileName = "/data/data/XX/databases/"
            + "XXX.db";

    // Open the empty db as the output stream
    OutputStream myOutput = new FileOutputStream(outFileName);

    // Transfer bytes from the inputfile to the outputfile
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer)) > 0) {
        myOutput.write(buffer, 0, length);
    }

    // Close the streams
    myOutput.flush();
    myOutput.close();
    myInput.close();
    buffer = null;
    outFileName = null;
}
catch (IOException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
}

当前回答

添加android:requestLegacyExternalStorage="true"到android Manifest中它在SDK 29+的Android 10 (Q)上工作或迁移Android X后。

 <application
    android:name=".MyApplication"
    android:allowBackup="true"
    android:hardwareAccelerated="true"
    android:icon=""
    android:label=""
    android:largeHeap="true"
    android:supportsRtl=""
    android:theme=""
    android:requestLegacyExternalStorage="true">

2019-12-10 11:42:02

其他回答

我在小米设备(android 10)上也遇到了同样的错误。下面的代码解决了我的问题。图书馆:Dexter(https://github.com/Karumi/Dexter)和Image picker(https://github.com/Dhaval2404/ImagePicker)

添加manifest (android:requestLegacyExternalStorage="true")

    public void showPickImageSheet(AddImageModel model) {
    BottomSheetHelper.showPickImageSheet(this, new BottomSheetHelper.PickImageDialogListener() {
        @Override
        public void onChooseFromGalleryClicked(Dialog dialog) {
            selectedImagePickerPosition = model.getPosition();
            Dexter.withContext(OrderReviewActivity.this)                   .withPermissions(Manifest.permission.READ_EXTERNAL_STORAGE)
                    .withListener(new MultiplePermissionsListener() {
                        @Override
                        public void onPermissionsChecked(MultiplePermissionsReport report) {
                            if (report.areAllPermissionsGranted()) {
                                ImagePicker.with(OrderReviewActivity.this)
                                        .galleryOnly()
                                        .compress(512)
                                        .maxResultSize(852,480)
                               .start();
                            }
                        }

                        @Override
                        public void onPermissionRationaleShouldBeShown(List<PermissionRequest> list, PermissionToken permissionToken) {
                            permissionToken.continuePermissionRequest();
                        }

                    }).check();

            dialog.dismiss();
        }

        @Override
        public void onTakePhotoClicked(Dialog dialog) {
            selectedImagePickerPosition = model.getPosition();
            ImagePicker.with(OrderReviewActivity.this)
                    .cameraOnly()
                    .compress(512)
                    .maxResultSize(852,480)
                    .start();

            dialog.dismiss();
        }

        @Override
        public void onCancelButtonClicked(Dialog dialog) {
            dialog.dismiss();
        }
    });
}

2021-11-29 07:47:54

也许答案是这样的:

在API >= 23个设备上，如果你安装了app (app不是系统app)，你应该在“设置-应用程序”中检查存储权限，每个应用程序都有权限列表，你应该检查它!试一试

2017-04-28 02:25:21

当您的应用程序属于系统应用程序时，它不能访问SD卡。

2012-11-21 07:41:44

在manifest中添加权限。

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

2016-10-21 09:53:03

2022 Kotlin请求许可的方式:

private val writeStoragePermissionResult =
   registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { permissions ->}

private fun askForStoragePermission(): Boolean =
   if (hasPermissions(
           requireContext(),
           Manifest.permission.READ_EXTERNAL_STORAGE,
           Manifest.permission.WRITE_EXTERNAL_STORAGE
       )
   ) {
       true
   } else {
       writeStoragePermissionResult.launch(
           arrayOf(
               Manifest.permission.READ_EXTERNAL_STORAGE,
               Manifest.permission.WRITE_EXTERNAL_STORAGE,
           )
       )
       false
   }

fun hasPermissions(context: Context, vararg permissions: String): Boolean = permissions.all {
    ActivityCompat.checkSelfPermission(context, it) == PackageManager.PERMISSION_GRANTED
}

2022-06-03 12:17:21

Android上的异常“打开失败:EACCES(权限被拒绝)”

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