我刚刚将源代码迁移到 Androidx，因为我这样做了，共享声音的共享功能不再起作用。Logcat 说：Failed to save file: /storage/emulated/0/appfolder/testsound.mp3 (Permission denied)这是保存声音的部分： 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); }我需要改变什么？如何让每个人无论使用哪个 Android 版本（minSdkVersion 16）都可以下载和分享声音？
2 回答
繁星点点滴滴
TA贡献1803条经验 获得超3个赞
如果您的目标平台为 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
（以下两个代码块来自developer.android.com文档。）
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 标志在将媒体文件写入磁盘时获得对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);
慕运维8079593
TA贡献1876条经验 获得超5个赞
我被困了很长时间，这对我来说效果很好
StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder(); StrictMode.setVmPolicy(builder.build()); File = new File(filepath);
并且不要忘记在清单文件中请求旧存储。
<application android:requestLegacyExternalStorage="true" >
添加回答
举报
0/150
提交
取消