解决android studio模拟器不及时刷新导入的数据（比如mp3文件）

声明：本文是收集自网上的提问与回复

首先扫描制定文件的类

public class MediaScannerFile {
 
    /**
     * 扫描指定的文件
     * 
     * @param context
     * @param filePath
     * @param sListener
     */
    public MediaScannerConnection scanFile(Context context,
            String[] filePath, String[] mineType,
            OnScanCompletedListener sListener) {
 
        ClientProxy client = new ClientProxy(filePath, mineType, sListener);
 
        try {
            MediaScannerConnection connection = new MediaScannerConnection(
                    context.getApplicationContext(), client);
            client.mConnection = connection;
            connection.connect();
            return connection;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    class ClientProxy implements MediaScannerConnectionClient {
 
        final String[] mPaths;
        final String[] mMimeTypes;
        final OnScanCompletedListener mClient;
        MediaScannerConnection mConnection;
        int mNextPath;
 
        ClientProxy(String[] paths, String[] mimeTypes,
                OnScanCompletedListener client) {
            mPaths = paths;
            mMimeTypes = mimeTypes;
            mClient = client;
        }
 
        public void onMediaScannerConnected() {
            scanNextPath();
        }
 
        public void onScanCompleted(String path, Uri uri) {
            if (mClient != null) {
                mClient.onScanCompleted(path, uri);
            }
            scanNextPath();
        }
 
        /**
         * 自动扫描下一个
         */
        void scanNextPath() {
            if (mNextPath >= mPaths.length) {
                mConnection.disconnect();
                return;
            }
            String mimeType = mMimeTypes != null ? mMimeTypes[mNextPath]
                    : null;
            mConnection.scanFile(mPaths[mNextPath], mimeType);
            mNextPath++;
        }
    }
}

调用

添加扫描完毕的监听：

    MediaScannerFile mMediaScannerFile = new MediaScannerFile();
 
                                if (null != mMediaScannerFile) {
 
                                    mMediaScannerFile
                                            .scanFile(context,
                                                    new String[] { dinfo
                                                            .getSavePath() },
                                                    null, new OnScanCompletedListener());
                                }

注：直接复制粘贴以上代码后，所有代码段均可通过导包的方式来消去红线报错（alt+enter组合键），除了dinfo.getSavePath()这句。这句其实就是代表需要扫描的文件夹所在路径。

参考以下方式修改这句代码：


将scan_Music函数修改后：
private void scan_Music(String filepath){
        MediaScannerFile mMediaScannerFile = new MediaScannerFile();

        if (null != mMediaScannerFile) {

            mMediaScannerFile.scanFile(this, new String[] { filepath },
                            null, new MediaScannerConnection.OnScanCompletedListener() {
                        @Override
                        public void onScanCompleted(String s, Uri uri) {

                        }
                    });
        }


    }

调用代码：

String filepath = "/sdcard";
scan_Music(filepath);//扫描指定文件夹下的所有音乐，为的就是刷新新加进来的音乐文件

原文网址：新下载的MP3文件是如何实时添加到android的多媒体数据库的？--优快云问答