android 使用sts s3上傳

服務端生成sts給的AWS憑證是動態的，每1小時更新一次。

dependencies {
    def aws_version = "2.16.+"
    implementation "com.amazonaws:aws-android-sdk-s3:$aws_version"
    implementation ("com.amazonaws:aws-android-sdk-mobile-client:$aws_version") { transitive = true }
}

    public void downloadFileByKey(String key) throws
 
 JSONException {
        JSONObject jsonConfig = new JSONObject();
        JSONObject s3TransferUtility = new JSONObject();
        jsonConfig.putOpt("S3TransferUtility", s3TransferUtility);
        s3TransferUtility.put("Region", "服務端請求來的region");
        s3TransferUtility.put("Bucket", "服務端請求來bucket");

        AWSSessionCredentials credentials 
 
= new AWSSessionCredentials() {
            @Override
            public String getSessionToken() {
                return "服務端請求過來的SessionToken";
            }

            @Override
            public String getAWSAccessKeyId() {
                return "服務端請求來的AccessKey";
            }

            @Override
            
 
public String getAWSSecretKey() {
                return "服務端請求來的SecretKey";
            }
        };

        AWSConfiguration configuration = new AWSConfiguration(jsonConfig);
        TransferUtility utility = TransferUtility.builder()
                .context(this)
                .s3Client(new AmazonS3Client(credentials))
                .awsConfiguration(configuration)
                .build();

        File file = new File(Environment.getExternalStorageDirectory().getPath() + "/test44.png");
        TransferObserver observer = utility.download(key, file);
        observer.setTransferListener(new TransferListener() {
            @Override
            public void onStateChanged(int i, TransferState transferState) {
                if (transferState == TransferState.COMPLETED) {
                    //下載完成了
                }
            }

            @Override
            public void onProgressChanged(int i, long l, long l1) {

            }

            @Override
            public void onError(int i, Exception e) {
                //下載出錯
            }
        });
   }

以上是下載檔案，上傳檔案類似：

TransferObserver observer = utility.upload(key, file);