how to display images in android application from

Question

As I new to android development, I have to develop application in which, Google app engine is involved. What I want to do is I want to fetch the images from Google app engine cloud and show it in android application. I am not able to fetch it that image from cloud to android.

Please help...

Thanks,

Answer 1

You should check and implement Dynamic Image Server with Google App Engine.

Here you can find example of Java program that can be ported easily for your Android development https://developers.google.com/appengine/articles/java/serving_dynamic_images

Answer 2

You can utilize Google Cloud Endpoints for sending data from your datastore, including images stored in blobproperty, to your android client and then display them. You can read upon the details of google cloud endpoints , which also has the sample code and other SO threads for understanding how to setup communication between android and appengine datastore through rest api based on endpoints. I am adding below the details only for blobproperty as it is not mentioned in detail in the document :

1, For sending blobproperty through endpoints, you need to use BytesField in protorpc which will automatically send the pic as base64 encoded

2, In android , you define a string property to receive the bytesfield data in the message through endpoints

@com.google.api.client.util.Key
    private String pic;

3, If you are using sqlite in android to locally store the received image, you should use blob type for the pic column C_PIC +" blob and you can insert the received string value into this

4,While reading from android's sqlite database for displaying, you can store the pic into a byte[] and then decode the base64 encoded pic as another byte[] and then convert it into a bitmap and display it using a suitable imageview :

byte[] picblob = cursor.getBlob(cursor.getColumnIndex(Yourdatabase.C_PIC));

if (picblob!=null){
                byte[] decodedString = Base64.decode(picblob, Base64.DEFAULT);
               Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);

        ((ImageView)view).setImageBitmap(decodedByte);
}

Answer 3

I'm hesitant about Mahesh's answer because, though it provides some client code, that code is not enough and really doesn't compare with the features of newer libraries.

I think the harder part will be the client, so I think it is important that you pick a good client library. So, you should take a look at Volley and Picasso, and see what best suites your needs.

I think you will find the server side to be easy in comparison, and you should take a look at Google Cloud Storage too.

Also, since you mention you are new to this, I will suggest you avoid a common mistake of automatically picking the Google library/service (volley, in this case). Google libraries are often not as good as people expect (and have much poorer docs then expected). I haven't used Picasso, but it is from Square and they are highly regarded for their contributions to Android.