How to make a search online

I have a google image search app in android studio. It can search for an image on google, using the image search. I found out that if I add "sites:ebay.com,amazon.com", Google searches the image in those sites, so I want to add that string to the image search, so that google returns the results of that image from those 2 sites.
This is the code I have for the image search:

public class SearchGoogleIntentActivity extends ActionBarActivity
{
    private  DisplayImageOptions options = null;
    private  ImageLoader imageLoader = null;
    // Asynchronous task for fetching Google hash of image
    class GoogleImageHashJob extends AsyncTask<Bitmap, Void, Integer>
    {
        @Override
        protected Integer doInBackground(Bitmap[] bitmap)
        {
            try
            {
                // Send bitmap to google hash server
                String hash = GoogleImageHash.hashFromBitmap(bitmap[0]);

                // Send hash link to browser
                Intent openHashURLinBrowser = new Intent(Intent.ACTION_VIEW);
                openHashURLinBrowser.setData(Uri.parse(hash+"Sites:ebay.com,amazon.com"));

                startActivityForResult(openHashURLinBrowser, 0);
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }

            return 0;
        }

        // Close splash screen after hash has been fetched and browser intent sent
        @Override
        protected void onPostExecute(Integer result)
        {
            if (result == 0)
                SearchGoogleIntentActivity.this.finish();
        }
    }

    // Load splash screen
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // Setup activity
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_reverse_image_search_google);

        // Load intent
        Intent intent = getIntent();
        Uri imageUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM);

//        Toast.makeText(this, imageUri.toString(), Toast.LENGTH_LONG).show();

        // Load image

        ImageView imageView = (ImageView) findViewById(R.id.imageView);

        imageLoader = ImageLoader.getInstance();
        ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(this));

        options = new DisplayImageOptions.Builder()
                .cacheInMemory(true)
                .cacheOnDisk(true)
                .considerExifParams(true)
                .bitmapConfig(Bitmap.Config.RGB_565)
                .build();
        imageLoader.displayImage(imageUri.toString(), imageView, options, null);


        Bitmap bitmap = ImageLoader.getInstance().loadImageSync(imageUri.toString());
//        imageView.setImageBitmap(bitmap);

        // Run hash job
        GoogleImageHashJob job = new GoogleImageHashJob();
        job.execute(bitmap);
    }

/*
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_reverse_image_search_google, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
    */

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);


    }
}

The thing is that even though I added that string after hash in the parse uri, I am only getting the image search results from google, and no results from the sites I added.
Can someone please help me?
Thanks.

How do I configure my app to use google api to make the search by site possible?
I looked at the link you gave, but it doesn't show how to configure it in andoid studio.

Once I have added the google search api, can I add the sites programatically? If so, please tell me how.
Thanks.