如何玩从Amazon S3的视频在Android应用程序？

问题描述：

我用 AWS-Android的SDK-1.4.3 /样本/ S3_SimpleDB_SNS_SQS_Demo 来preVIEW存储在Amazon（亚马逊简单存储服务），我的文件。翻翻code，我看到，他们利用这一点，来存取权限的文件：

I use aws-android-sdk-1.4.3/samples/S3_SimpleDB_SNS_SQS_Demo to preview my files stored on Amazon (Amazon Simple Storage Service). Looking through code I saw that they use this, to acces the files:

com.amazonaws.demo.s3.S3.getDataForObject（第130行）

 public static String getDataForObject( String bucketName, String objectName ) {
        return read( getInstance().getObject( bucketName, objectName ).getObjectContent() );
    }


protected static String read( InputStream stream ) {
    try {
        ByteArrayOutputStream baos = new ByteArrayOutputStream( 8196 );
        byte[] buffer = new byte[1024];
        int length = 0;
        while ( ( length = stream.read( buffer ) ) > 0 ) {
            baos.write( buffer, 0, length );
        }

        return baos.toString();
    }
    catch ( Exception exception ) {
        return exception.getMessage();

    }
}

}

嗯，我已经修改了此方法，以返回 ByteArrayOutputStream ，而不是那么我很容易把它转换为字符串或位图（将 ByteArrayOutputStream.toByteArray（）然后使用 BitmapFactory.de codeByteArray（byte []的数据，诠释抵消，诠释长度，选项选择采用））。

Well, I have modified this methods to return ByteArrayOutputStream instead then I easily transform it to String or Bitmap (applying ByteArrayOutputStream.toByteArray() then using BitmapFactory.decodeByteArray(byte[] data, int offset, int length, Options opts)).

所以，它适用于文本文件和图片。我的问题是，当我尝试访问的视频。所以，我的问题是：

So, it works on text-files and pictures. My problem is when I try to access videos. So, my questions are:

1，使用上面提供的方法，我怎么能得到从 ByteArrayOutputStream 视频（ ByteArrayOutputStream.toString（）），并在播放一个 VideoView 或使用的MediaPlayer 或办法...？

1.Using the method provided above, how could I get a video from ByteArrayOutputStream (ByteArrayOutputStream.toString()) and play it in a VideoView or using MediaPlayer or an approach... ?

2。有谁知道任何其他解决方案以preVIEW视频这个问题，存储在Amazon？（听说他们的 SDK 为 IOS 他们使用的URL来访问文件...）

2 . Does anybody know any other solution to this problem of preview videos stored on Amazon ? (I heard that on their sdk for IOS they use URLs to access files...)

PS：供应文件的URL并打开它在浏览器中没有任何意义，因为这个URL的诡计后过期

PS: Supplying the file URL and open it in browser does not make sense, because this URLs expire after a wile.

答

首先，我们要为我们的桶的名称和对象（见 AWS-Android的SDK-1.4.3 /样本/ S3_SimpleDB_SNS_SQS_Demo 的COMPLET指南）我们要打开，然后获取URL我们的目标：

First we have to provide the name of our bucket and the object (see aws-android-sdk-1.4.3/samples/S3_SimpleDB_SNS_SQS_Demo for a complet guide) we want to open then get the URL to our object:

    AWSCredentials myCredentials = new BasicAWSCredentials("YOUR_AMAZON_ACCESS_KEY_ID", "YOUR_AMAZON_SECRET_KEY_ID");
    AmazonS3 s3client = new AmazonS3Client(myCredentials);
    GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucketName, objectName);
    URL objectURL = s3client.generatePresignedUrl(request);

现在，只需播放视频在视频来看，提供的网址获得：

Now, just play the video in a video view, supplying the URL obtained:

    getWindow().setFormat(PixelFormat.TRANSLUCENT);
    mediaCtrl = new MediaController(this);
    mediaCtrl.setMediaPlayer(videoView);
    videoView.setMediaController(mediaCtrl);
    Uri clip = Uri.parse(objectURL.toString());
    videoView.setVideoURI(clip);
    videoView.requestFocus();
    videoView.start();

我要称谢@CommonsWare为

I want to give thanks to @CommonsWare for

说明我通过 REST API （甚至是code我用的是从 AWS-SDK 读 REST API 文件帮我，也表明亚马逊请求对象）的其他方式

indicating me through REST API (even the code I used is from aws-sdk reading the REST API documentation helped me and show also other ways of requesting Amazon objects)

说明我使用生成presignedUrl（）

在code的播放视频也激发了他的材料的。

如何玩从Amazon S3的视频在Android应用程序？

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