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();
}
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
}
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();
}
});
}
奇怪的是，在我的newFile之前加上斜杠“/”后，我的问题就解决了。我改了这个:
File myFile= new File(Environment.getExternalStorageDirectory() + "newFile");
:
File myFile= new File(Environment.getExternalStorageDirectory() + "/newFile");
更新:
正如评论中提到的，正确的做法是:
File myFile= new File(Environment.getExternalStorageDirectory(), "newFile");
