Androidで画像を選択して、S3にアップロードする ref: http://qiita.com/takuhiro/items/a04974f0f09e5f68805a

AndroidManifesto.xml

<service
    android:name="com.amazonaws.mobileconnectors.s3.transferutility.TransferService"
    android:enabled="true" />

build.gradle

dependencies {
    compile 'com.amazonaws:aws-android-sdk-s3:2.+'
}

ImageUploadActivity.java

private void uploadFile(final Context context, File file) {
    ...省略
    TransferObserver transferObserver = transferUtility.upload("my_bucket", "my_images/01.jpg", file, CannedAccessControlList.PublicRead);
    transferObserver.setTransferListener(new TransferListener() {
        @Override
        public void onStateChanged(int id, TransferState state) {
            switch (state) {
                case COMPLETED:
                    Toast.makeText(context, "Completed to upload an image to S3.", Toast.LENGTH_SHORT).show();
                    mUploadFile.delete();
                    break;
                case IN_PROGRESS:
                    break;
                default:
                    mUploadFile.delete();
            }
        }

        @Override
        public void onProgressChanged(int id, long bytesCurrent, long bytesTotal) {
            // Do nothing
        }

        @Override
        public void onError(int id, Exception ex) {
            ex.printStackTrace();
            Toast.makeText(context, "Failed to upload an image to S3.", Toast.LENGTH_SHORT).show();
            mUploadFile.delete();
        }
    });
}