Android Open Source - ChicagoWaterWalk-Android Point Of Interest Grid View Pager Fragment

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2014 The Illinois-Indiana Sea Grant
 *//from   w  ww . ja v  a2  s . c  om
 * 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 org.iisgcp.waterwalk.fragment;

import org.iisgcp.waterwalk.R;
import org.iisgcp.waterwalk.utils.ImageFetcher;
import org.iisgcp.waterwalk.utils.OnPageSelectedListener;
import org.iisgcp.waterwalk.utils.Utils;
import org.iisgcp.waterwalk.utils.ImageCache.ImageCacheParams;

import android.app.Activity;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class PointOfInterestGridViewPagerFragment extends Fragment {

  private static final String INTENT_POSITION = "position";  
    private static final String IMAGE_CACHE_DIR = "poi_thumbs";
  
    private ImageFetcher mImageFetcher;
    
  private OnPageSelectedListener mListener;
  
  private ViewPager mPager;
  private GridPagerAdapter mAdapter;
  
    public static PointOfInterestGridViewPagerFragment newInstance(int position) {
      PointOfInterestGridViewPagerFragment f = new PointOfInterestGridViewPagerFragment();

        // Supply title and poi input as an argument.
        Bundle args = new Bundle();
        args.putInt(INTENT_POSITION, position);
        f.setArguments(args);

        return f;
    }
  
    @Override
    public void onAttach(Activity activity) {
      super.onAttach(activity);
       
      try {
            mListener = (OnPageSelectedListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement OnPageSelectedListener");
        }
    }
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
       
      setRetainInstance(true);
      
      ImageCacheParams cacheParams = new ImageCacheParams(getActivity(), IMAGE_CACHE_DIR);
        cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memory

        // The ImageFetcher takes care of loading images into our ImageView children asynchronously
        mImageFetcher = new ImageFetcher(getActivity(), Utils.getLargestGridDimension(getActivity()));
        mImageFetcher.setLoadingImage(R.drawable.empty_photo);
        mImageFetcher.addImageCache(getActivity().getSupportFragmentManager(), cacheParams);
    }
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
      super.onCreateView(inflater, container, savedInstanceState);
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_point_of_interest_grid_view_pager, container, false);
        mPager = (ViewPager) view.findViewById(R.id.pager);
        return view;
    }
    
    public void onActivityCreated (Bundle savedInstanceState) {
      super.onActivityCreated(savedInstanceState);

        // Instantiate a ViewPager and a PagerAdapter.
      mAdapter = new GridPagerAdapter(getChildFragmentManager());
        mPager.setAdapter(mAdapter);
        mPager.setOnPageChangeListener(new OnPageChangeListener() {

      @Override
      public void onPageScrollStateChanged(int arg0) {
        
      }

      @Override
      public void onPageScrolled(int arg0, float arg1, int arg2) {
        
      }

      @Override
      public void onPageSelected(int position) {
        mListener.onPageSelected(position);
        
        String title = null;
            
            TypedArray routes = PointOfInterestGridViewPagerFragment.this.getResources().obtainTypedArray(R.array.routes);
            
            for (int i = 0; i < routes.length(); i++) {
              if (i == position) {
                int resid = routes.getResourceId(i, -1);
                TypedArray route = PointOfInterestGridViewPagerFragment.this.getResources().obtainTypedArray(resid);
                title = getString(route.getResourceId(0, -1));
                route.recycle();
              }
            }
            
            routes.recycle();
            
            PointOfInterestGridViewPagerFragment.this.getActivity().setTitle(title);
      }
          
        });
        mPager.setCurrentItem(getArguments().getInt(INTENT_POSITION));
    }
    
    @Override
    public void onResume() {
        super.onResume();
        mImageFetcher.setExitTasksEarly(false);
        mAdapter.notifyDataSetChanged();
    }

    @Override
    public void onPause() {
        super.onPause();
        mImageFetcher.setPauseWork(false);
        mImageFetcher.setExitTasksEarly(true);
        mImageFetcher.flushCache();
    }
    
    @Override
    public void onDestroy() {
        super.onDestroy();
        mImageFetcher.closeCache();
    }
    
    /**
     * Called by the ViewPager child fragments to load images via the one ImageFetcher
     */
    public ImageFetcher getImageFetcher() {
        return mImageFetcher;
    }
    
    private class GridPagerAdapter extends FragmentStatePagerAdapter {
      public GridPagerAdapter(FragmentManager fm) {
        super(fm);
        }
      
        @Override
        public Fragment getItem(int position) {
          Fragment fragment = null;
          String title = null;
          int resid = -1;
          
          TypedArray routes = PointOfInterestGridViewPagerFragment.this.getResources().obtainTypedArray(R.array.routes);
          
          for (int i = 0; i < routes.length(); i++) {
            if (i == position) {
              resid = routes.getResourceId(i, -1);
              TypedArray route = PointOfInterestGridViewPagerFragment.this.getResources().obtainTypedArray(resid);
              title = getString(route.getResourceId(0, -1));
              route.recycle();
            }
          }
          
          fragment = PointOfInterestGridFragment.newInstance(title, resid);
          
          routes.recycle();

            return fragment;
        }

        @Override
        public int getCount() {
          TypedArray routes = PointOfInterestGridViewPagerFragment.this.getResources().obtainTypedArray(R.array.routes);
          int count = routes.length();
          routes.recycle();
          
            return count;
        }
        
        @Override
        public Parcelable saveState() {
          return null;
        }
    }
}

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