Android Open Source - SandB-Android Image Pager Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

package edu.grinnell.sandb;
//  w w  w  . j av a2 s .c  o  m
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.app.NavUtils;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.MenuItem;
import com.flurry.android.FlurryAgent;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

/* Activity to display a full screen pager to scroll through images in an article */
public class ImagePagerActivity extends SherlockActivity {

  protected ImageLoader imageLoader = ImageLoader.getInstance();

  DisplayImageOptions options;
  ViewPager pager;

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Make the activity fill the whole screen
    getSupportActionBar().hide();
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.image_pager);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    Bundle bundle = getIntent().getExtras();
    String[] imageUrls = bundle.getStringArray("ArticleImages");
    String[] imageTitles = bundle.getStringArray("ImageTitles");

    options = new DisplayImageOptions.Builder()
        // change these images to error messages
        .showImageForEmptyUri(R.drawable.sandblogo)
        .showImageOnFail(R.drawable.sandblogo).resetViewBeforeLoading()
        .cacheOnDisc().imageScaleType(ImageScaleType.EXACTLY)
        .bitmapConfig(Bitmap.Config.RGB_565)
        .displayer(new FadeInBitmapDisplayer(300)).build();

    pager = (ViewPager) findViewById(R.id.pager);
    pager.setAdapter(new ImagePagerAdapter(imageUrls, imageTitles));
  }

  private class ImagePagerAdapter extends PagerAdapter {

    private String[] images;
    private String[] titles;
    private LayoutInflater inflater;

    ImagePagerAdapter(String[] images, String[] titles) {
      this.images = images;
      this.titles = titles;
      inflater = getLayoutInflater();
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
      ((ViewPager) container).removeView((View) object);
    }

    @Override
    public void finishUpdate(View container) {
    }

    @Override
    public int getCount() {
      return images.length;
    }

    @Override
    public Object instantiateItem(ViewGroup view, int position) {
      View imageLayout = inflater.inflate(R.layout.item_pager_image,
          view, false);
      ImageView imageView = (ImageView) imageLayout
          .findViewById(R.id.image);
      final ProgressBar spinner = (ProgressBar) imageLayout
          .findViewById(R.id.loading);

      imageLoader.displayImage(images[position], imageView, options,
          new SimpleImageLoadingListener() {
            @Override
            public void onLoadingStarted(String imageUri, View view) {
              spinner.setVisibility(View.VISIBLE);
            }

            @Override
            public void onLoadingFailed(String imageUri, View view,
                FailReason failReason) {
              String message = null;
              switch (failReason.getType()) {
              case IO_ERROR:
                message = "Input/Output error";
                break;
              case DECODING_ERROR:
                message = "Image can't be decoded";
                break;
              case NETWORK_DENIED:
                message = "Downloads are denied";
                break;
              case OUT_OF_MEMORY:
                message = "Out Of Memory error";
                break;
              case UNKNOWN:
                message = "Unknown error";
                break;
              }
              Toast.makeText(ImagePagerActivity.this, message,
                  Toast.LENGTH_SHORT).show();
              spinner.setVisibility(View.GONE);
            }

            @Override
            public void onLoadingComplete(String imageUri,
                View view, Bitmap loadedImage) {
              spinner.setVisibility(View.GONE);
            }
          });

      // TextView titleView = (TextView)
      // imageLayout.findViewById(R.id.title);
      // titleView.setText(titles[position]);

      ((ViewPager) view).addView(imageLayout, 0);
      return imageLayout;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
      return view.equals(object);
    }

    @Override
    public void restoreState(Parcelable state, ClassLoader loader) {
    }

    @Override
    public Parcelable saveState() {
      return null;
    }

    @Override
    public void startUpdate(View container) {
    }
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == android.R.id.home) {

      Intent upIntent = new Intent(this, MainActivity.class);
      upIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
          | Intent.FLAG_ACTIVITY_SINGLE_TOP);
      NavUtils.navigateUpTo(this, upIntent);

      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  @Override
  protected void onStart() {
    super.onStart();
    FlurryAgent.onStartSession(this, "B3PJX5MJNYMNSB9XQS3P");
  }

  @Override
  protected void onStop() {
    super.onStop();
    FlurryAgent.onEndSession(this);
  }

}
Java Source Code List
