Question

我在尝试从Google相册中选择视频时收到null 如果视频也存储在外部存储器中，但它无法正常工作，则可以使用如果它只在谷歌照片上可用。我尝试了很多解决方案，但不知道如何实现这一目标。下面是我用来获取URI的类。

public class FilePath {
    private static final DecimalFormat format = new DecimalFormat("#.##");
    private static final long MiB = 1024 * 1024;
    private static final long KiB = 1024;

    public static String getPath(final Context context, String string) {
        return getPath(context, Uri.parse(string));
    }

    public static String getPath(final Context context, final Uri uri) {

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }

                // TODO handle non-primary volumes
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[] {
                        split[1]
                };

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }

    /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri The Uri to query.
     * @param selection (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    public static String getDataColumn(Context context, Uri uri, String selection,
                                       String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {
                column
        };

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    public static String getFileSize(File file) {

        if (!file.isFile()) {
            throw new IllegalArgumentException("Expected a file");
        }
        final double length = file.length();

        if (length > MiB) {
            return format.format(length / MiB) + " MB";
        }
        if (length > KiB) {
            return format.format(length / KiB) + " KB";
        }
        return format.format(length) + " B";
    }
}

提前致谢。

Answer 1

您无权阅读我认为Google Photo向您发送文件的媒体。您必须使用getContentResolver().openInputStream(uri)作为InputStream打开，并在您的活动中显示Google Photo发送给您的照片。您的代码是不可接受的。尝试搜索SO以获取此主题。它经过多次讨论。

            Intent intent = getIntent();
            if (Intent.ACTION_SEND.equals(intent.getAction()){
                uri = intent.getParcelableExtra(Intent.EXTRA_STREAM);
                if (uri != null) {
                    InputStream is = getContentResolver().openInputStream(uri);
                    long fileSize = is.available()
                    //Do some suff to show stream as a picture in the Activity
                }
            }

当图片存储在内置手机内存中时，此代码适用于Android 7.0上的最新Google相册应用。 如果Google相册在云端的某处保留了所需文件，则必须在后台线程中从is加载数据，以避免Networking on main thread例外。

尝试从Google相册中选择视频时，我将无效

1 个答案: