我有一个应用程序,用户可以通过选择一个文件或将所选目录中的所有文件添加到 ListView
中来添加音乐文件。 .添加单个文件时,一切都很好,但对于目录,我得到 Unsupported Uri
.问题与权限无关:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dibo.testapp, PID: 12226
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=65579, result=-1, data=Intent { dat=content://com.android.providers.downloads.documents/tree/raw:/storage/emulated/0/Download/2006 A Good Year flg=0xc3 }} to activity {com.example.dibo.testapp/com.example.dibo.testapp.MainActivity}: java.lang.UnsupportedOperationException: Unsupported Uri content://com.android.providers.downloads.documents/tree/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2F2006%20A%20Good%20Year
at android.app.ActivityThread.deliverResults(ActivityThread.java:4360)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4402)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.UnsupportedOperationException: Unsupported Uri content://com.android.providers.downloads.documents/tree/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2F2006%20A%20Good%20Year
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:167)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:418)
at android.content.ContentResolver.query(ContentResolver.java:802)
at android.content.ContentResolver.query(ContentResolver.java:752)
at android.content.ContentResolver.query(ContentResolver.java:710)
at com.example.dibo.testapp.PlaylistFragment.addFolder(PlaylistFragment.java:380)
at com.example.dibo.testapp.PlaylistFragment.onActivityResult(PlaylistFragment.java:346)
at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:160)
at com.example.dibo.testapp.MainActivity.onActivityResult(MainActivity.java:152)
at android.app.Activity.dispatchActivityResult(Activity.java:7454)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4353)
这是 Intent 请求:*
private void selectDirectory() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
startActivityForResult(intent, REQUEST_FOLDER);
}
结果处理程序:
@Override
public void onActivityResult(int requestCode, int resultCode,
Intent resultData) {
if (requestCode == REQUEST_FILE && resultCode == Activity.RESULT_OK) {
if (resultData != null) {
addFile(resultData.getData());
}
}
if (requestCode == REQUEST_FOLDER && resultCode == Activity.RESULT_OK) {
if (resultData != null) {
addFolder(resultData.getData());
}
}
}
private void addFolder(Uri uri) {
ContentResolver contentResolver = getActivity().getContentResolver();
if (contentResolver==null) {
return;
}
Cursor cursor = contentResolver.query(
uri, // Uri
null,
null,
null,
null
);
if (cursor != null && cursor.moveToFirst()) {
int Title = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
do {
String SongTitle = cursor.getString(Title);
Log.d("addFolder", SongTitle);
} while (cursor.moveToNext());
}
if (cursor != null) {
cursor.close();
}
}
contentResolver.query
中引发异常.请注意,所有内容都在 Fragment
中类,不在 Activity
.
最佳答案
你需要先做神奇的事情:
Uri docUriTree = DocumentsContract.buildDocumentUriUsingTree(treeUri, DocumentsContract.getTreeDocumentId(treeUri));
然后您可以从您的 Uri 中读取 DocumentsContract.Document 值。
关于java - 传递 Intent 返回的 Uri 时 ContentResolver 中不支持的 Uri,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54161951/