Android Open Source - connexus-android Grid Fragment

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Back to project page connexus-android.

License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 Zach Whaley, Trevor Latson
 *//from  www .  j a v  a2s.co 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 ginger.connexus.fragment;

import ginger.connexus.BuildConfig;
import ginger.connexus.R;
import ginger.connexus.adapter.ImageAdapter;
import ginger.connexus.util.ImageCache.ImageCacheParams;
import ginger.connexus.util.ImageFetcher;

import java.util.ArrayList;
import java.util.List;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.GridView;

public abstract class GridFragment extends SpiceFragment implements AdapterView.OnItemClickListener {

    private static final String TAG = GridFragment.class.toString();
    private static final String IMAGE_CACHE_DIR = "thumbs";

    public static final String FORWARD_INTENT = "fwd_intent";

    private int mImageThumbSize;
    private int mImageThumbSpacing;
    private ImageFetcher mImageFetcher;

    protected Intent mIntent;
    protected ImageAdapter mAdapter;

    protected void reloadImages(List<String> imageUrls) {
        if (getActivity() != null && mAdapter != null) {
            if (imageUrls != null) {
                mAdapter.clear();
                mAdapter.addAll(imageUrls);
                mAdapter.notifyDataSetChanged();
            }
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);

        mImageThumbSize = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_size);
        mImageThumbSpacing = getResources().getDimensionPixelSize(R.dimen.image_thumbnail_spacing);

        ImageCacheParams cacheParams = new ImageCacheParams(getActivity(), IMAGE_CACHE_DIR);

        // Set memory cache to 25% of app memory
        cacheParams.setMemCacheSizePercent(0.25f);

        // The ImageFetcher takes care of loading images into our ImageView
        // children asynchronously
        mImageFetcher = new ImageFetcher(getActivity(), mImageThumbSize);
        mImageFetcher.setLoadingImage(R.drawable.empty_photo);
        mImageFetcher.addImageCache(getActivity().getSupportFragmentManager(), cacheParams);

        mAdapter = new ImageAdapter(getActivity(), new ArrayList<String>(), mImageFetcher);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        final View v = inflater.inflate(R.layout.fragment_image_grid, container, false);
        final GridView mGridView = (GridView) v.findViewById(R.id.gridView);
        mGridView.setAdapter(mAdapter);
        mGridView.setOnItemClickListener(this);
        mGridView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView absListView, int scrollState) {
                // Pause fetcher to ensure smoother scrolling when flinging
                if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_FLING) {
                    mImageFetcher.setPauseWork(true);
                } else {
                    mImageFetcher.setPauseWork(false);
                }
            }

            @Override
            public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            }
        });

        // This listener is used to get the final width of the GridView and then
        // calculate the number of columns and the width of each column. The
        // width of each column is variable as the GridView has
        // stretchMode=columnWidth. The column width is used to set the height
        // of each view so we get nice square thumbnails.
        mGridView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                if (mAdapter.getNumColumns() == 0) {
                    final int numColumns = (int) Math.floor(mGridView.getWidth()
                            / (mImageThumbSize + mImageThumbSpacing));
                    if (numColumns > 0) {
                        final int columnWidth = (mGridView.getWidth() / numColumns) - mImageThumbSpacing;
                        mAdapter.setNumColumns(numColumns);
                        mAdapter.setItemHeight(columnWidth);
                        if (BuildConfig.DEBUG) {
                            Log.d(TAG, "onCreateView - numColumns set to " + numColumns);
                        }
                    }
                }
            }
        });

        return v;
    }

    @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();
    }

}

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