在Android的SD卡 [英] SD card in Android

问题描述

在我的应用我有两个按钮，播放和下载。在downlod按钮下载我从互联网上，并存储在SD卡中的视频，我会从SD卡时preSS播放按钮播放视频。

In my app I have two buttons play and download. In the downlod button I download video from internet and store in SD card, i will play video from the SD card when press play button.

视频成功下载并存储在SD卡中。如果我preSS播放按钮，我会列出从SD卡视频（的logcat ）并播放下载的视频。它不显示已下载的视频名称，但如果我从我的系统中打开SD卡下载的视频存储在SD卡中。我不知道我错了。

Video is successfully downloaded and stored in SD card. If I press play button, I will list videos from SD card(in logcat) and play the downloaded video. It does not show the downloaded video name, but if I open the SD card from my system the downloaded video is stored in SD card. i do not know where i am wrong.

推荐答案

您需要的媒体文件添加到媒体商店，以便由画廊控件可以看出。使用MediaScanner。我用这个方便的包装在我的code：

You have to add media files to Media Store in order to be seen by gallery widget. Use MediaScanner. I use this convenient wrapper in my code:

public class MediaScannerWrapper implements  
MediaScannerConnection.MediaScannerConnectionClient {
    private MediaScannerConnection mConnection;
    private String mPath;
    private String mMimeType;

    // filePath - where to scan; 
    // mime type of media to scan i.e. "image/jpeg". 
    // use "*/*" for any media
    public MediaScannerWrapper(Context ctx, String filePath, String mime){
        mPath = filePath;
        mMimeType = mime;
        mConnection = new MediaScannerConnection(ctx, this);
    }

    // do the scanning
    public void scan() {
        mConnection.connect();
    }

    // start the scan when scanner is ready
    public void onMediaScannerConnected() {
        mConnection.scanFile(mPath, mMimeType);
        Log.w("MediaScannerWrapper", "media file scanned: " + mPath);
    }

    public void onScanCompleted(String path, Uri uri) {
        // when scan is completes, update media file tags
    }
}

然后实例 MediaScannerWrapper 和启动扫描（）。你可以调整它在同时处理多个文件。提示：通过列表的文件的路径，然后循环回路 mConnection.scanFile

Then instantiate MediaScannerWrapper and start it with scan(). You could tweak it to handle more than one file at the time. Hint: pass List of File paths, and then loop around mConnection.scanFile.

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