IllegalArgumentException：列'_data'不存在

Question

在Nougat中，此功能无效。

String path = getRealPathFromURI(this, getIntent().getParcelableExtra(Intent.EXTRA_STREAM));

public String getRealPathFromURI(Context context, Uri contentUri) {
    Cursor cursor = null;
    try {
        String[] proj = {MediaStore.Images.Media.DATA};
        cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        if (cursor == null) return contentUri.getPath();
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}

崩溃日志：

java.lang.RuntimeException: Unable to start activity ComponentInfo{class path}: java.lang.IllegalArgumentException: column '_data' does not exist
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
   at android.app.ActivityThread.-wrap12(ActivityThread.java)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:154)
   at android.app.ActivityThread.main(ActivityThread.java:6123)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by java.lang.IllegalArgumentException: column '_data' does not exist
   at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:333)
   at android.database.CursorWrapper.getColumnIndexOrThrow(CursorWrapper.java:87)
   at com.package.SaveImageActivity.getRealPathFromURI()
   at com.package.SaveImageActivity.onCreate()
   at android.app.Activity.performCreate(Activity.java:6672)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
   at android.app.ActivityThread.-wrap12(ActivityThread.java)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:154)
   at android.app.ActivityThread.main(ActivityThread.java:6123)
   at java.lang.reflect.Method.invoke(Method.java)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)

此功能在Android N之前的设备中正常工作。我阅读了文章file:// scheme is now not allowed to be attached with Intent on targetSdkVersion 24 (Android Nougat)。但找不到任何解决方案。所以请帮忙。

Answer 1

此功能在Android N之前的设备中正常运行

它适用于非常少的Uri值，可能没有结果（例如，对于由MediaStore索引的非本地文件的东西），并且可能没有可用的结果（例如，对于可移动存储上的文件）。

所以请帮忙。

使用ContentResolver和openInputStream()在InputStream识别的内容上获得Uri。理想情况下，只需直接使用该流，无论您尝试做什么。或者，在您控制的文件上使用InputStream和一些FileOutputStream来制作内容的副本，然后使用该文件。

Answer 2

根据CommonsWare给出的答案，解决方案代码是：

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();
    }
}

我希望这可以帮助你。

IOUtils.copy的起源来自这个站点：https://www.developerfeed.com/copy-bytes-inputstream-outputstream-android/（可能需要更改一点异常，但它可以根据需要工作）

Answer 3

//以下代码适用于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();
}

Answer 4

@Redturbo我不能写评论，我在这里写

IOUtils.copyStream(inputStream, outputStream);

TEMP_DIR_PATH - 您的任何目录路径，如下所示

 File rootDataDir = context.getFilesDir();
 File copyFile = new File( rootDataDir + File.separator + fileName + ".jpg");