Using Google Cloud Storage JSON api in android

Question

I want to upload image on Google Cloud Storage from my android app. For that I searched and found that GCS JSON Api provides this feature. I did a lot of research for Android sample which demonstrates its use. On the developer site they have provided code example that only support java. I don't know how to use that API in Android. I referred this and this links but couldn't get much idea. Please guide me on how i can use this api with android app.

Answer 1

Ok guys so I solved it and got my images being uploaded in Cloud Storage all good. This is how:

Note: I used the XML API it is pretty much the same.

First , you will need to download a lot of libraries. The easiest way to do this is create a maven project and let it download all the dependencies required. From this sample project : Sample Project The libraries should be:

Second , you must be familiar with Cloud Storage using the api console You must create a project, create a bucket, give the bucket permissions, etc. You can find more details about that here

Third , once you have all those things ready it is time to start coding. Lets say we want to upload an image: Cloud storage works with OAuth, that means you must be an authenticated user to use the API. For that the best way is to authorize using Service Accounts . Dont worry about it, the only thing you need to do is in the API console get a service account like this:

We will use this service account on our code.

Fourth , lets write some code, lets say upload an image to cloud storage. For this code to work you must put your key generated in step 3 in assets folder, i named it "key.p12".

I don't recommend you to do this on your production version, since you will be giving out your key.

try{
httpTransport= new com.google.api.client.http.javanet.NetHttpTransport();


//agarro la key y la convierto en un file
AssetManager am = context.getAssets();
InputStream inputStream = am.open("key.p12"); //you should not put the key in assets in prod version.



//convert key into class File. from inputstream to file. in an aux class.
File file = UserProfileImageUploadHelper.createFileFromInputStream(inputStream,context);


//Google Credentianls
GoogleCredential credential = new GoogleCredential.Builder().setTransport(httpTransport)
        .setJsonFactory(JSON_FACTORY)
        .setServiceAccountId(SERVICE_ACCOUNT_EMAIL)
        .setServiceAccountScopes(Collections.singleton(STORAGE_SCOPE))
        .setServiceAccountPrivateKeyFromP12File(file)
        .build();




String URI = "https://storage.googleapis.com/" + BUCKET_NAME+"/"+imagename+".jpg";
HttpRequestFactory requestFactory = httpTransport.createRequestFactory(credential);


GenericUrl url = new GenericUrl(URI);




//byte array holds the data, in this case the image i want to upload in bytes.

HttpContent contentsend = new ByteArrayContent("image/jpeg", byteArray );


HttpRequest putRequest = requestFactory.buildPutRequest(url, contentsend);



com.google.api.client.http.HttpResponse response = putRequest.execute();
String content = response.parseAsString();
Log.d("debug", "response is:"+response.getStatusCode());
Log.d("debug", "response content is:"+content);} catch (Exception e) Log.d("debug", "Error in  user profile image uploading", e);}

This will upload the image to your cloud bucket.

For more info on the api check this link Cloud XML API