Android Open Source - semana-isw2013 Image Pager Activity

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License

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Apache License
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Java Source Code

/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *//w  ww.j  a v a 2 s  . c  o m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package mobi.itson.semanaisw2013app;

import android.R.drawable;
import android.annotation.TargetApi;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Build;
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.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.widget.ShareActionProvider;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
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;

/**
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 */
public class ImagePagerActivity extends SherlockActivity {

  public static final String IMAGES = "com.nostra13.example.universalimageloader.IMAGES";
  public static final String IMAGE_POSITION = "com.nostra13.example.universalimageloader.IMAGE_POSITION";
  private static final String STATE_POSITION = "STATE_POSITION";

  DisplayImageOptions options;

  ViewPager pager;
  
  private ImageLoader imageLoader = ImageLoader.getInstance();
  
  private ShareActionProvider mShareActionProvider;

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if(!imageLoader.isInited()){
      imageLoader.init(ImageLoaderConfiguration.createDefault(this));
    }
    setContentView(R.layout.ac_image_pager);
    setupActionBar();
    Bundle bundle = getIntent().getExtras();
    String[] imageUrls = bundle.getStringArray(IMAGES);
    int pagerPosition = bundle.getInt(IMAGE_POSITION, 0);

    if (savedInstanceState != null) {
      pagerPosition = savedInstanceState.getInt(STATE_POSITION);
    }

    options = new DisplayImageOptions.Builder()
      .showImageForEmptyUri(drawable.ic_delete)
      .showImageOnFail(drawable.ic_input_delete)
      .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));
    pager.setCurrentItem(pagerPosition);
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    return true;
  }
  
  private Intent getDefaultShareIntent(){
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("image/*");
        return intent;
    }
  
  // Call to update the share intent
  private void setShareIntent(Intent shareIntent) {
      if (mShareActionProvider != null) {
          mShareActionProvider.setShareIntent(shareIntent);
      }
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      NavUtils.navigateUpFromSameTask(this);
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  private void setupActionBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      getActionBar().setDisplayHomeAsUpEnabled(true);
    } else {
      getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
  }

  @Override
  public void onSaveInstanceState(Bundle outState) {
    outState.putInt(STATE_POSITION, pager.getCurrentItem());
  }

  private class ImagePagerAdapter extends PagerAdapter {

    private String[] images;
    private LayoutInflater inflater;

    ImagePagerAdapter(String[] images) {
      this.images = images;
      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);
        }
      });

      ((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) {
    }
  }
}
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