android – 从真正的路径获取Uri

在文件路径中转换“file：// …”,使用以下代码查找项目的ID,然后将其附加到提供者URI.此外,基于文件扩展名,使用正确的提供程序(例如MediaStore.Video.Media.EXTERNAL_CONTENT_URI或MediaStore. Image.Media.EXTERNAL_CONTENT_URI)

/**
 * Given a media filename,returns it's id in the media content provider
 *
 * @param providerUri
 * @param appContext
 * @param filename
 * @return
 */
public long getMediaItemIdFromProvider(Uri providerUri,Context appContext,String fileName) {
    //find id of the media provider item based on filename
    String[] projection = { Mediacolumns._ID,Mediacolumns.DATA };
    cursor cursor = appContext.getContentResolver().query(
            providerUri,projection,Mediacolumns.DATA + "=?",new String[] { filename },null);
    if (null == cursor) {
        Log.d(tag_LOG,"Null cursor for file " + fileName);
        return ITEMID_NOT_FOUND;
    }
    long id = ITEMID_NOT_FOUND;
    if (cursor.getCount() > 0) {
        cursor.moveToFirst();
        id = cursor.getLong(cursor.getcolumnIndexOrThrow(Basecolumns._ID));
    }
    cursor.close();
    return id;
}

有时,在将一个媒体文件添加到设备的存储中后,MediaProvider不会立即刷新.您可以使用此方法强制刷新其记录：

/**
 * Force a refresh of media content provider for specific item
 * 
 * @param filename
 */
private void refreshMediaProvider(Context appContext,String fileName) {
    MediaScAnnerConnection scAnner = null;
    try {
        scAnner = new MediaScAnnerConnection(appContext,null);
        scAnner.connect();
        try {
            Thread.sleep(200);
        } catch (Exception E) {
        }
        if (scAnner.isConnected()) {
            Log.d(tag_LOG,"requesTing scan for file " + fileName);
            scAnner.scanFile(filename,null);
        }
    } catch (Exception E) {
        Log.e(tag_LOG,"CAnnot to scan file",E);
    } finally {
        if (scAnner != null) {
            scAnner.disconnect();
        }
    }
}