我刚刚将我的源代码迁移到了 Androidx，因为我这样做了我的共享功能来共享声音不再工作。Logcat 说：
Failed to save file: /storage/emulated/0/appfolder/testsound.mp3 (Permission denied)
这是它保存声音的部分：
final String fileName = soundObject.getItemName() + ".mp3";
File storage = Environment.getExternalStorageDirectory();
File directory = new File(storage.getAbsolutePath() + "/appfolder/");
directory.mkdirs();
final File file = new File(directory, fileName);
InputStream in = view.getContext().getResources().openRawResource(soundObject.getItemID());
try{
Log.i(LOG_TAG, "Saving sound " + soundObject.getItemName());
OutputStream out = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer, 0, buffer.length)) != -1){
out.write(buffer, 0 , len);
}
in.close();
out.close();
} catch (IOException e){
Log.e(LOG_TAG, "Failed to save file: " + e.getMessage());
}
这是它共享声音的代码：
try{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1){
if (ActivityCompat.checkSelfPermission(view.getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions((Activity) view.getContext(), new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}else {
final String AUTHORITY = view.getContext().getPackageName() + ".fileprovider";
Uri contentUri = FileProvider.getUriForFile(view.getContext(), AUTHORITY, file);
final Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, contentUri);
intent.setType("audio/mp3");
view.getContext().startActivity(Intent.createChooser(intent, "Share sound via..."));
}
}
else {
final Intent intent = new Intent(Intent.ACTION_SEND);
Uri fileUri = Uri.parse(file.getAbsolutePath());
intent.putExtra(Intent.EXTRA_STREAM, fileUri);
intent.setType("audio/mp3");
view.getContext().startActivity(Intent.createChooser(intent, "Share sound via..."));
}
} catch (Exception e){
Log.e(LOG_TAG, "Failed to share sound: " + e.getMessage());
}
}
我需要改变什么，我怎样才能让每个人无论他使用哪个 Android 版本（minSdkVersion 16）都可以下载和分享声音？
可悲的是，我收到了很多差评，因为没有人可以分享（即使 Android 9 及以下版本也无法分享，尽管他们曾经可以）谢谢
如果您面向 Android 10 或更高版本，请在应用的清单文件中将 requestLegacyExternalStorage 的值设置为 true：
<manifest ... >
<!-- This attribute is "false" by default on apps targeting
Android 10 or higher. -->
<application android:requestLegacyExternalStorage="true" ... >
...
</application>
</manifest>
访问文件
要加载媒体文件，请从ContentResolver调用以下方法之一：
Uri contentUri = ContentUris.withAppendedId(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
cursor.getLong(Integer.parseInt(BaseColumns._ID)));
String fileOpenMode = "r";
ParcelFileDescriptor parcelFd = resolver.openFileDescriptor(uri, fileOpenMode);
if (parcelFd != null) {
int fd = parcelFd.detachFd();
// Pass the integer value "fd" into your native code. Remember to call
// close(2) on the file descriptor when you're done using it.
}
在运行 Android 10（API 级别 29）及更高版本的设备上，您的应用可以使用 IS_PENDING 标志获得对写入磁盘的媒体文件的独占访问权限。
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DISPLAY_NAME, "IMG1024.JPG");
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.Images.Media.IS_PENDING, 1);
ContentResolver resolver = context.getContentResolver();
Uri collection = MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY);
Uri item = resolver.insert(collection, values);
try (ParcelFileDescriptor pfd = resolver.openFileDescriptor(item, "w", null)) {
// Write data into the pending image.
} catch (IOException e) {
e.printStackTrace();
}
// Now that we're finished, release the "pending" status, and allow other apps
// to view the image.
values.clear();
values.put(MediaStore.Images.Media.IS_PENDING, 0);
resolver.update(item, values, null, null);
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