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近期，公司要求使用OSS下载文件，优化下载模块

implementation 'com.aliyun.dpa:oss-android-sdk:2.9.5'   // implementation project(':oss-android-sdk')

依赖下载成功后，需要配置Config文件（提高安全性，使用STS方式）

public class Config {       // 访问的endpoint地址    public static final String OSS_ENDPOINT = "后台获取的end_point地址";    //callback 测试地址    public static final String OSS_CALLBACK_URL = "上传的callback";       public static final String STS_SERVER_URL = "后台获取STS地址";//STS 地址    public static final String BUCKET_NAME = "后台提供的Bucket_name";    public static final String OSS_ACCESS_KEY_ID = "后台提供的AccessKeyID";    public static final String OSS_ACCESS_KEY_SECRET = "后台提供的AccessKeySecret";    public static final int DOWNLOAD_SUC = 1;    public static final int DOWNLOAD_Fail = 2;    public static final int UPLOAD_SUC = 3;    public static final int UPLOAD_Fail = 4;    public static final int UPLOAD_PROGRESS = 5;    public static final int LIST_SUC = 6;    public static final int HEAD_SUC = 7;    public static final int RESUMABLE_SUC = 8;    public static final int SIGN_SUC = 9;    public static final int BUCKET_SUC = 10;    public static final int GET_STS_SUC = 11;    public static final int MULTIPART_SUC = 12;    public static final int STS_TOKEN_SUC = 13;    public static final int FAIL = 9999;    public static final int REQUESTCODE_AUTH = 10111;    public static final int REQUESTCODE_LOCALPHOTOS = 10112;    public static final int REQUESTCODE_OPEN_DOCUMENT = 10113;}

在我们配置好Config文件后，就可以初始化OSS了：

OSSCredentialProvider credentialProvider;        //使用自己的获取STSToken的类       	credentialProvider = new OSSAuthCredentialsProvider(Config.STS_SERVER_URL);       	editBucketName = Config.BUCKET_NAME;        ClientConfiguration conf = new ClientConfiguration();        conf.setConnectionTimeout(15 * 1000); // 连接超时，默认15秒        conf.setSocketTimeout(15 * 1000); // socket超时，默认15秒        conf.setMaxConcurrentRequest(5); // 最大并发请求书，默认5个        conf.setMaxErrorRetry(2); // 失败后最大重试次数，默认2次        OSS oss = new OSSClient(getApplicationContext(), endpoint, credentialProvider, conf);        OSSLog.enableLog();		//开启Log打印        return new OssService(oss, editBucketName, displayer);

初始化完成后，就可以进行下载啦：

GetObjectRequest get = new GetObjectRequest(Config.BUCKET_NAME, 下载的文件路径);		//此处为设置进度条，如不需要可以删除        get.setProgressListener(new OSSProgressCallback
   
    () {               @Override            public void onProgress(GetObjectRequest request, long currentSize, long totalSize) {                   Log.d("GetObject", "currentSize: " + currentSize + " totalSize: " + totalSize);                int progress = (int) (100 * currentSize / totalSize);                mDisplayer.updateProgress(progress);                mDisplayer.displayInfo("下载进度: " + String.valueOf(progress) + "%");            }        });        OSSLog.logDebug("asyncGetObject");        // 此处下载任务        OSSAsyncTask task = mOss.asyncGetObject(get, new OSSCompletedCallback
    
     () {               @Override            public void onSuccess(GetObjectRequest request, GetObjectResult result) {                   // 请求成功                InputStream inputStream = result.getObjectContent();                //Bitmap bm = BitmapFactory.decodeStream(inputStream);                try {                       //需要根据对应的View大小来自适应缩放                    Bitmap bm = mDisplayer.autoResizeFromStream(inputStream);                    long get_end = System.currentTimeMillis();                    OSSLog.logDebug("get cost: " + (get_end - get_start) / 1000f);                    mDisplayer.downloadComplete(bm);                    mDisplayer.displayInfo("Bucket: " + mBucket + "\nObject: " + request.getObjectKey() + "\nRequestId: " + result.getRequestId());                } catch (IOException e) {                       e.printStackTrace();                }            }            @Override            public void onFailure(GetObjectRequest request, ClientException clientExcepion, ServiceException serviceException) {                   String info = "";                // 请求异常                if (clientExcepion != null) {                       // 本地异常如网络异常等                    clientExcepion.printStackTrace();                    info = clientExcepion.toString();                }                if (serviceException != null) {                       // 服务异常                    Log.e("ErrorCode", serviceException.getErrorCode());                    Log.e("RequestId", serviceException.getRequestId());                    Log.e("HostId", serviceException.getHostId());                    Log.e("RawMessage", serviceException.getRawMessage());                    info = serviceException.toString();                }                mDisplayer.downloadFail(info);                mDisplayer.displayInfo(info);            }        });
    
   

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