Android Open Source - bv-android-sdk Reviews Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.example.productwidgetexample;
// w ww.  ja v  a  2s . c om
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

/**
 * ReviewsActivity.java <br>
 * ProductWidgetExample<br>
 * 
 * <p>
 * This is a review browsing screen. It loads the product image and review
 * content on creation, and utilizes savedInstanceState to limit the amount of
 * data usage by restoring the information we previously downloaded.
 * 
 * <p>
 * Created on 7/3/12. Copyright (c) 2012 BazaarVoice. All rights reserved.
 * 
 * @author Bazaarvoice Engineering
 */
public class ReviewsActivity extends Activity {

  private BazaarProduct selectedProduct;
  private ListView reviewList;
  private TextView noReviews;
  private ReviewAdapter listAdapter;
  private ProgressDialog progDialog;
  protected String TAG = "ReviewsActivity";
  protected int imageCounter;

  /**
   * Pulls the product out of the Intent if this is a new instance, or the
   * savedInstanceState if this is a recycled instance and does any other
   * necessary work needed to set up the display.
   * 
   * @param savedInstanceState
   */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.reviews);

    Intent myIntent = getIntent();
    if (myIntent != null) {
      selectedProduct = myIntent.getParcelableExtra("product");

      initializeViews();
      progDialog.setCancelable(false);
      progDialog.show();
      downloadProductImage();
      if (selectedProduct.getNumReviews() != 0) {
        downloadReviews();
      } else {
        noReviews.setVisibility(View.VISIBLE);
      }

    } else if (savedInstanceState != null) {
      loadFromSavedState(savedInstanceState);
    }
  }

  /**
   * Loads the content of the activity from a saved state.
   * 
   * @param savedInstanceState
   *            the state saved in {@link #onSaveInstanceState(Bundle)}.
   */
  private void loadFromSavedState(Bundle savedInstanceState) {
    selectedProduct = savedInstanceState.getParcelable("product");
    ImageView productImage = (ImageView) findViewById(R.id.productImage);
    if (selectedProduct.getImageBitmap() != null) {
      Bitmap scaledImage = Bitmap.createScaledBitmap(
          selectedProduct.getImageBitmap(), 250, 250, true);
      productImage.setImageBitmap(scaledImage);
    } else {
      Log.i(TAG, "Downloading new product image");
      downloadProductImage();
    }
    initializeViews();
  }

  /**
   * Saves the current selected product and all of its review information.
   * 
   * @param bundle
   *            the bundle that is stored when the activity closes
   */
  @Override
  public void onSaveInstanceState(Bundle bundle) {
    super.onSaveInstanceState(bundle);
    bundle.putParcelable("product", selectedProduct);
  }

  /**
   * Sets up the views and puts an OnItemClickListener on the review list.
   */
  private void initializeViews() {
    TextView productTitle = (TextView) findViewById(R.id.productTitle);
    productTitle.setText(selectedProduct.getName());

    TextView productDescription = (TextView) findViewById(R.id.productDescription);
    productDescription.setText(selectedProduct.getDescription());

    TextView avgRating = (TextView) findViewById(R.id.avgRating);
    double rating = selectedProduct.getAverageRating();
    avgRating
        .setText("Average rating of "
            + (rating == -1.0 ? 0 : String.format("%.2f", rating))
            + "/5 based on " + selectedProduct.getNumReviews()
            + " reviews");

    noReviews = (TextView) findViewById(R.id.noReviews);

    listAdapter = new ReviewAdapter(this, selectedProduct.getReviews());
    reviewList = (ListView) findViewById(R.id.reviewList);
    reviewList.setAdapter(listAdapter);

    progDialog = new ProgressDialog(this);
    progDialog.setMessage("Getting reviews...");
  }

  /**
   * Sends a request to download the image and updates the UI when it
   * finishes.
   */
  private void downloadProductImage() {
    selectedProduct.downloadImage(new OnImageDownloadComplete() {

      @Override
      public void onFinish(final Bitmap image) {
        // Protect from image download errors
        if (image == null) {
          downloadProductImage();
          return;
        }
        runOnUiThread(new Runnable() {

          @Override
          public void run() {
            ImageView productImage = (ImageView) findViewById(R.id.productImage);
            Bitmap scaledImage = Bitmap.createScaledBitmap(image,
                250, 250, true);
            productImage.setImageBitmap(scaledImage);
            listAdapter.notifyDataSetChanged();

            /*
             * If there are no reviews, there is nothing more to
             * wait for.
             */
            if (selectedProduct.getNumReviews() == 0) {
              progDialog.dismiss();
            }
          }

        });
      }

    });
  }

  /**
   * Sends off a request for reviews and displays them on response.
   */
  private void downloadReviews() {
    selectedProduct.downloadReviews(new BazaarUIThreadResponse(this) {

      @Override
      public void onUiResponse(JSONObject json) {
        Log.i(TAG, "Response = \n" + json);
        try {
          displayReviews(json);
        } catch (JSONException exception) {
          Log.e(TAG,
              "Error = " + exception.getMessage() + "\n"
                  + Log.getStackTraceString(exception));
        }
      }

    });
  }

  /**
   * Parses the json response and saves all of the review information,
   * downloading images as needed. When all of the images are downloaded, the
   * loading dialog is dismissed.
   * 
   * @param json
   *            a response to a review query
   * @throws JSONException
   *             if a field is missing
   */
  protected void displayReviews(JSONObject json) throws JSONException {
    JSONArray results = json.getJSONArray("Results");
    for (int i = 0; i < results.length(); i++) {
      BazaarReview newReview = new BazaarReview(results.getJSONObject(i));
      selectedProduct.addReview(newReview);
      boolean imageDownloadStarted = newReview
          .downloadImage(new OnImageDownloadComplete() {

            @Override
            public void onFinish(Bitmap image) {
              imageCounter--;

              if (imageCounter == 0) {
                runOnUiThread(new Runnable() {

                  @Override
                  public void run() {
                    listAdapter.notifyDataSetChanged();
                    progDialog.dismiss();
                  }

                });
              }
            }

          });
      if (imageDownloadStarted) {
        imageCounter++;
      }
    }

    /*
     * No image downloads were started, we are done waiting
     */
    if (imageCounter == 0) {
      listAdapter.notifyDataSetChanged();
      progDialog.dismiss();
    }
  }

}

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