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

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();
        }
    });
}

其他回答

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"/>

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

修改/system/etc/permission/platform.xml中的权限属性 和小组需要提到如下。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">
    <group android:gid="sdcard_rw" />
    <group android:gid="media_rw" />    
</uses-permission>

我曾经在模拟器中运行应用程序时观察到这种情况。在模拟器设置中,您需要正确指定外部存储(“SD卡”)的大小。默认情况下,“外部存储”字段为空,这可能意味着没有这样的设备,即使在清单中授予了权限,也会抛出EACCES。

我的问题是“TargetApi(23)”,这是需要的,如果你的minSdkVersion是低于23。

因此,我已请求以下代码片段的权限

protected boolean shouldAskPermissions() {
    return (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP_MR1);
}

@TargetApi(23)
protected void askPermissions() {
    String[] permissions = {
            "android.permission.READ_EXTERNAL_STORAGE",
            "android.permission.WRITE_EXTERNAL_STORAGE"
    };
    int requestCode = 200;
    requestPermissions(permissions, requestCode);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
// ...
    if (shouldAskPermissions()) {
        askPermissions();
    }
}