1. 技术文章
  2. IllegalArgumentException: column '_data' does not exist

IllegalArgumentException: column '_data' does not exist

由 霸气de小男生 提交于 2019-11-28 20:26:01

This function is working properly in devices before Android N

It works for very few Uri values, may not have a result (e.g., for things that are indexed by MediaStore that are not local files), and may not have a usable result (e.g., for files on removable storage).

So please help.

Use a ContentResolver and openInputStream() to get an InputStream on the content identified by the Uri. Ideally, just use that stream directly, for whatever it is that you are trying to do. Or, use that InputStream and some FileOutputStream on a file that you control to make a copy of the content, then use that file.

As per given answer by CommonsWare, the solution code is :

public static String getFilePathFromURI(Context context, Uri contentUri) {
    //copy file and send new file path 
    String fileName = getFileName(contentUri);
    if (!TextUtils.isEmpty(fileName)) {
        File copyFile = new File(TEMP_DIR_PATH + File.separator + fileName);
        copy(context, contentUri, copyFile);
        return copyFile.getAbsolutePath();
    }
    return null;
}

public static String getFileName(Uri uri) {
    if (uri == null) return null;
    String fileName = null;
    String path = uri.getPath();
    int cut = path.lastIndexOf('/');
    if (cut != -1) {
        fileName = path.substring(cut + 1);
    }
    return fileName;
}

public static void copy(Context context, Uri srcUri, File dstFile) {
    try {
        InputStream inputStream = context.getContentResolver().openInputStream(srcUri);
        if (inputStream == null) return;
        OutputStream outputStream = new FileOutputStream(dstFile);
        IOUtils.copyStream(inputStream, outputStream);
        inputStream.close();
        outputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

I hope this helps you.

The origin of IOUtils.copy is from this site : https://www.developerfeed.com/copy-bytes-inputstream-outputstream-android/ (May need to change a bit the exception but it works as needed)

satyawan hajare

//The following code is working in Android N:

private static String getFilePathForN(Uri uri, Context context) {
    Uri returnUri = uri;
    Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
    /*
     * Get the column indexes of the data in the Cursor,
     *     * move to the first row in the Cursor, get the data,
     *     * and display it.
     * */
    int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
    int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
    returnCursor.moveToFirst();
    String name = (returnCursor.getString(nameIndex));
    String size = (Long.toString(returnCursor.getLong(sizeIndex)));
    File file = new File(context.getFilesDir(), name);
    try {
        InputStream inputStream = context.getContentResolver().openInputStream(uri);
        FileOutputStream outputStream = new FileOutputStream(file);
        int read = 0;
        int maxBufferSize = 1 * 1024 * 1024;
        int bytesAvailable = inputStream.available();

        //int bufferSize = 1024;
        int bufferSize = Math.min(bytesAvailable, maxBufferSize);

        final byte[] buffers = new byte[bufferSize];
        while ((read = inputStream.read(buffers)) != -1) {
            outputStream.write(buffers, 0, read);
        }
        Log.e("File Size", "Size " + file.length());
        inputStream.close();
        outputStream.close();
        Log.e("File Path", "Path " + file.getPath());
        Log.e("File Size", "Size " + file.length());
    } catch (Exception e) {
        Log.e("Exception", e.getMessage());
    }
    return file.getPath();
}

@Redturbo I can't write a comment, I write here

IOUtils.copyStream(inputStream, outputStream);

TEMP_DIR_PATH - any your directory path, something like this

 File rootDataDir = context.getFilesDir();
 File copyFile = new File( rootDataDir + File.separator + fileName + ".jpg");
标签
android
android-7.0-nougat
android-7.1-nougat
易学教程内所有资源均来自网络或用户发布的内容，如有违反法律规定的内容欢迎反馈！
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!