[移动开发]Android通过URI获取文件路径，帮你突破瓶颈

            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]};
           path = getDataColumn(context, contentUri, selection, selectionArgs);
           return path;
       }
   }

}

private 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;
}

private static boolean isExternalStorageDocument(Uri uri) {
return “com.android.externalstorage.documents”.equals(uri.getAuthority());
}

private static boolean isDownloadsDocument(Uri uri) {
return “com.android.providers.downloads.documents”.equals(uri.getAuthority());
}

private static boolean isMediaDocument(Uri uri) {
return “com.android.providers.media.documents”.equals(uri.getAuthority());
}

好了，上面的代码还是容易看懂的。这下就解决了对于 Android 4.4 及以上的机型适配。顺便把以 file:// 开头的 URI 适配也补上：

if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
path = uri.getPath();
return path;
}

完美了，下面就贴出完整的 FileUtils 代码，拿去用吧：

public final class FileUtils {

public static String getFilePathByUri(Context context, Uri uri) {
    String path = null;
    // 以 file:// 开头的
    if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
        path = uri.getPath();
        return path;
    }
    // 以 content:// 开头的，比如 content://media/extenral/images/media/17766
    if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
        Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null);
        if (cursor != null) {
            if (cursor.moveToFirst()) {
                int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                if (columnIndex > -1) {
                    path = cursor.getString(columnIndex);
                }
            }
            cursor.close();
        }
        return path;
    }
    // 4.4及之后的 是以 content:// 开头的，比如 content://com.android.providers.media.documents/document/image%3A235700
    if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme()) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        if (DocumentsContract.isDocumentUri(context, uri)) {
            if (isExternalStorageDocument(uri)) {
                // ExternalStorageProvider
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
                if ("primary".equalsIgnoreCase(type)) {
                    path = Environment.getExternalStorageDirectory() + "/" + split[1];
                    return path;
                }
            } else if (isDownloadsDocument(uri)) {
                // DownloadsProvider
                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),
                        Long.valueOf(id));
                path = getDataColumn(context, contentUri, null, null);
                return path;
            } else if (isMediaDocument(uri)) {
                // MediaProvider
                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]};
                path = getDataColumn(context, contentUri, selection, selectionArgs);
                return path;
            }
        }
    }
    return null;
}

private 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)