播放位于资产的文件夹的媒体文件 [英] Play media files located in assets folder

问题描述

我目前有在迅速加载和播放的时候使用媒体播放器类叫做Android项目的原始文件夹中的媒体文件集。我需要添加这些文件的更多的变化和分类到文件夹中，但显然原始文件夹不支持文件夹。我将能够迅速从资产的文件夹中加载这些文件，并与媒体播放器播放它们？如果是这样，怎么样？

I currently have a set of media files in the raw folder of the android project that are loaded quickly and played when called using the mediaplayer class. I need to add more variations of these files and categorize them into folders, but apparently the raw folder does not support folders. Would I be able to quickly load these files from the assets folder and play them with mediaplayer? If so, how?

推荐答案

我有这个方法返回的所有文件按扩展名的文件夹中的资产文件夹内：

I've this method that returns the all files by extension in a folder inside asset folder:

public static String[] getAllFilesInAssetByExtension(Context context, String path, String extension){
        Assert.assertNotNull(context);

        try {
            String[] files = context.getAssets().list(path);

            if(StringHelper.isNullOrEmpty(extension)){
                return files;
            }

            List<String> filesWithExtension = new ArrayList<String>();

            for(String file : files){
                if(file.endsWith(extension)){
                    filesWithExtension.add(file);
                }
            }

            return filesWithExtension.toArray(new String[filesWithExtension.size()]);  
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }

如果你调用它使用：

getAllFilesInAssetByExtension(yourcontext, "", ".mp3");

这将返回资产文件夹的根目录的所有我的MP3文件。

this will return all my mp3 files in the root of assets folder.

如果你调用它使用：

getAllFilesInAssetByExtension(yourcontext, "somefolder", ".mp3");

这将在somefolder的MP3文件中搜索

this will search in "somefolder" for mp3 files

现在你已经列出所有要打开的文件，你需要这样的：

Now that you have list all files to open you will need this:

AssetFileDescriptor descriptor = getAssets().openFd("myfile");

要播放的文件只是做：

MediaPlayer player = new MediaPlayer();

long start = descriptor.getStartOffset();
long end = descriptor.getLength();

player.setDataSource(this.descriptor.getFileDescriptor(), start, end);
player.prepare();

player.setVolume(1.0f, 1.0f);
player.start();

希望这有助于

Hope this helps

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