android.database.sqlite.SQLiteException：没有这样的列：bucket_display_name答案

【问题标题】：android.database.sqlite.SQLiteException: no such column: bucket_display_nameandroid.database.sqlite.SQLiteException：没有这样的列：bucket_display_name
【发布时间】：2020-01-22 14:41:59
【问题描述】：

我试图使用MediaStore 获取包含音频文件的存储桶。这在 Android 10 API 29 上运行良好，但不适用于以前的 Android 版本。我附上了 Android 10 API 29 上工作示例的屏幕截图。

原因：android.database.sqlite.SQLiteException：没有这样的列： bucket_display_name（代码 1 SQLITE_ERROR）：，编译时：SELECT bucket_display_name, bucket_id FROM audio ORDER BY date_added ASC

日志猫。

Caused by: android.database.sqlite.SQLiteException: no such column: bucket_display_name (code 1 SQLITE_ERROR): , while compiling: SELECT bucket_display_name, bucket_id FROM audio ORDER BY date_added ASC
        at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:179)
        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.aisar.mediaplayer.fragments.AudioFolderFragment$AsyncVideoFolderLoader.doInBackground(AudioFolderFragment.java:148)
        at com.aisar.mediaplayer.fragments.AudioFolderFragment$AsyncVideoFolderLoader.doInBackground(AudioFolderFragment.java:130)
        at android.os.AsyncTask$2.call(AsyncTask.java:333)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764)

代码：

class AsyncVideoFolderLoader extends AsyncTask<String, String, List<ModelAudioFolder>> {

    private String sortBy;

    public AsyncVideoFolderLoader(String sortBy) {
        this.sortBy = sortBy;
    }

    @Override
    protected List<ModelAudioFolder> doInBackground(String... strings) {
        List<ModelAudioFolder> videoItems = new ArrayList<>();
        videoItems.clear();

        final HashMap<String, ModelAudioFolder> output = new HashMap<>();
        final Uri contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

        final String[] projection = {MediaStore.Audio.Media.BUCKET_DISPLAY_NAME, MediaStore.Audio.Media.BUCKET_ID};

        try (final Cursor cursor = getActivity().getContentResolver().query(
                contentUri,
                projection,
                null,
                null,
                "" + sortBy)) {
            if ((cursor != null) && (cursor.moveToFirst())) {
                final int columnBucketName = cursor.getColumnIndex(MediaStore.Audio.Media.BUCKET_DISPLAY_NAME);
                final int columnBucketId = cursor.getColumnIndex(MediaStore.Audio.Media.BUCKET_ID);


                do {
                    final String bucketName = cursor.getString(columnBucketName);
                    final String bucketId = cursor.getString(columnBucketId);

                    if (!output.containsKey(bucketId)) {
                        final int count = getCount(contentUri, bucketId);

                        final ModelAudioFolder item = new ModelAudioFolder(
                                "" + bucketId,
                                "" + bucketName,
                                "",
                                "" + getPath(bucketId),
                                "" + count
                        );

                        output.put(bucketId, item);
                        videoItems.add(item);

                    }

                } while (cursor.moveToNext());
            }
        }
        return videoItems;
    }

    private int getCount(@NonNull final Uri contentUri, @NonNull final String bucketId) {
        try (final Cursor cursor = getActivity().getContentResolver().query(contentUri,
                null, MediaStore.Audio.Media.BUCKET_ID + "=?", new String[]{bucketId}, null)) {
            return ((cursor == null) || (cursor.moveToFirst() == false)) ? 0 : cursor.getCount();
        }
    }

    private String getPath(String BUCKET_ID) {
        String path = "";
        String selection = null;
        String[] projection = {
                MediaStore.Audio.Media.DATA,
                MediaStore.Audio.Media.BUCKET_ID
        };
        Cursor cursor = getActivity().getContentResolver().query(
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                projection,
                selection,
                null,
                null);
        while (cursor.moveToNext()) {
            if (BUCKET_ID.equals(cursor.getString(1))) {
                //add only those videos that are in selected/chosen folder
                path = cursor.getString(0);
            }
        }
        return path;
    }

    @Override
    protected void onPostExecute(List<ModelAudioFolder> audioFolderList) {
        super.onPostExecute(audioFolderList);

        if (audioFolderList.size() <= 0) {
            noFoldersRl.setVisibility(View.VISIBLE);
            foldersRl.setVisibility(View.GONE);
        } else {
            noFoldersRl.setVisibility(View.GONE);
            foldersRl.setVisibility(View.VISIBLE);
        }

        Log.d("FoldersSize", "onPostExecute: " + audioFolderList.size());

        adapterAudioFolder = new AdapterAudioFolder(getActivity(), audioFolderList, dashboardActivity);
        foldersRv.setAdapter(adapterAudioFolder);
    }
}

...

【问题讨论】：

贴出表'audio'的创建/结构代码
这是使用“MediaStore”类加载音频存储桶的完整类。如果我仍然理解错误，请告诉我
我可以得到文件夹名称。我发布了解决方案here

标签： java android android-sqlite mediastore sqliteexception

【解决方案1】：

异常原因是BUCKET_DISPLAY_NAME。它是在 API 29 中添加的。在此之前，我们将 DISPLAY_NAME 用于 API 28 及以下版本。请参考文档BUCKET_DISPLAY_NAME。

对于解决方案，您可以根据当前 API 级别编写条件。对于获取文件夹名称，您可以使用RELATIVE_PATH。

【讨论】：

有什么方法可以让存储桶在 API 29 以下有音频文件？
我想在他们发布相同的支持 sdk 之前没有办法
和 'RELATIVE_PATH' 也被添加到 API 29 中。我认为那没有办法

【解决方案2】：

在 API 版本中

也就是说，在 29 以下版本中获取 audios 的 BUCKET_DISPLAY_NAME 的解决方案是解析 MediaStore.Files.FileColumns.DATA。该字段在 29 中已弃用，但在以前的版本中仍然有效。

该字段包含实际路径 + 文件名，由于 BUCKET_DISPLAY_NAME 实际上是文件所在的实际父文件夹名称，您需要做的是删除文件名，并且然后从路径中最后找到的反斜杠开始获取子字符串。

【讨论】：

【解决方案3】：

我现在自己做了。首先检索所有音频文件，然后分离音频 URI。从音频 URI 中，我得到了文件夹名称。我在这里发布我的解决方案，以便其他人可以从中受益。

class AsyncVideoFolderLoader extends AsyncTask<String, String, List<ModelAudioFolder>> {

    private Cursor cursor;
    List<ModelAudioTe> audioList;

    private String sortBy;

    public AsyncVideoFolderLoader(String sortBy) {
        this.sortBy = sortBy;
    }

    @Override
    protected List<ModelAudioFolder> doInBackground(String... strings) {

        String selection = null;
        String[] projection;
        projection = new String[]{
                MediaStore.Audio.Media._ID,
                MediaStore.Audio.Media.TITLE,
                MediaStore.Audio.Media.ARTIST,
                MediaStore.Audio.Media.DURATION,
                MediaStore.Audio.Media.ALBUM,
                MediaStore.Audio.Media.DATA,
                MediaStore.Audio.Media.SIZE,
                MediaStore.Audio.Media.ALBUM_ID
        };
        cursor = getActivity().getContentResolver().query(
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                projection,
                selection,
                null,
                null);
        audioList = new ArrayList<>();
        ModelAudioTe modelAudio;
        while (cursor.moveToNext()) {


            modelAudio = new ModelAudioTe(
                    "" + cursor.getString(0),
                    "" + cursor.getString(1),
                    "" + cursor.getString(2),
                    "" + cursor.getString(3),
                    "" + cursor.getString(4),
                    "" + cursor.getString(5),
                    "" + cursor.getString(6),
                    "" + cursor.getString(7));
            audioList.add(modelAudio);

        }


        //creating audio paths/uris list
        ArrayList<String> pathsList = new ArrayList<>();
        pathsList.clear();
        for (int i = 0; i < audioList.size(); i++) {
            String folderName = new File(audioList.get(i).getDATA()).getParentFile().getName();
            String folderId = new File(audioList.get(i).getDATA()).getParentFile().getParent();
            pathsList.add(folderId + "/" + folderName);
        }


        //generating folder names from audio paths/uris
        List<ModelAudioFolder> folderList = new ArrayList<>();
        folderList.clear();
        for (int i = 0; i < audioList.size(); i++) {

            String folderName = new File(audioList.get(i).getDATA()).getParentFile().getName();
            String folderId = new File(audioList.get(i).getDATA()).getParentFile().getParent();
            int count = Collections.frequency(pathsList, folderId + "/" + folderName);

            String folderRoot;
            String folderRoot1 = "";
            if (audioList.get(i).getDATA().contains("emulated")) {
                folderRoot = "emulated";
            } else {
                folderRoot = "storage";
            }

            if (i > 0) {
                if (audioList.get(i - 1).getDATA().contains("emulated")) {
                    folderRoot1 = "emulated";
                } else {
                    folderRoot1 = "storage";
                }
            }
            if (i == 0) {

                ModelAudioFolder model = new ModelAudioFolder("" + folderId + "/" + folderName, "" + folderName, "", "" + folderId + "/" + folderName, "" + count);
                folderList.add(model);
                Log.d("The_Tag1", "onCreate: " + folderName + " " + folderRoot + " " + folderId + "/" + folderName + " " + count);

            } else if (
                    folderName.equals(new File(audioList.get(i - 1).getDATA()).getParentFile().getName())
                            &&
                            folderRoot.equals(folderRoot1)

            ) {
                //exclude
            } else {
                ModelAudioFolder model = new ModelAudioFolder("" + folderId + "/" + folderName, "" + folderName, "", "" + folderId + "/" + folderName, "" + count);
                folderList.add(model);

                Log.d("The_Tag1", "onCreate: " + folderName + " " + folderRoot + " " + folderId + "/" + folderName + " " + " " + count);

            }

        }


        return folderList;
    }

    @Override
    protected void onPostExecute(List<ModelAudioFolder> audioFolderList) {
        super.onPostExecute(audioFolderList);

        Log.d("ModelAudioFolder_Size", "Count:" + audioFolderList.size());

        try {
            if (audioFolderList.size() <= 0) {
                noFoldersRl.setVisibility(View.VISIBLE);
                foldersRl.setVisibility(View.GONE);
            } else {
                noFoldersRl.setVisibility(View.GONE);
                foldersRl.setVisibility(View.VISIBLE);
            }

            Log.d("FoldersSize", "onPostExecute: " + audioFolderList.size());

            adapterAudioFolder = new AdapterAudioFolder(getActivity(), audioFolderList, dashboardActivity);
            foldersRv.setAdapter(adapterAudioFolder);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

【讨论】：