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DisplayingBitmaps / src / com.example.android.displayingbitmaps / ui /

ImageDetailFragment.java

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/*
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 * Copyright (C) 2012 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.displayingbitmaps.ui;
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import android.os.Bundle;
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import android.support.v4.app.Fragment;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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import android.widget.ProgressBar;
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import com.example.android.displayingbitmaps.R;
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import com.example.android.displayingbitmaps.util.ImageFetcher;
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import com.example.android.displayingbitmaps.util.ImageWorker;
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import com.example.android.displayingbitmaps.util.Utils;
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/**
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 * This fragment will populate the children of the ViewPager from {@link ImageDetailActivity}.
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 */
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public class ImageDetailFragment extends Fragment implements ImageWorker.OnImageLoadedListener {
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    private static final String IMAGE_DATA_EXTRA = "extra_image_data";
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    private String mImageUrl;
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    private ImageView mImageView;
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    private ProgressBar mProgressBar;
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    private ImageFetcher mImageFetcher;
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    /**
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     * Factory method to generate a new instance of the fragment given an image number.
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     *
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     * @param imageUrl The image url to load
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     * @return A new instance of ImageDetailFragment with imageNum extras
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     */
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    public static ImageDetailFragment newInstance(String imageUrl) {
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        final ImageDetailFragment f = new ImageDetailFragment();
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        final Bundle args = new Bundle();
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        args.putString(IMAGE_DATA_EXTRA, imageUrl);
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        f.setArguments(args);
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        return f;
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    }
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    /**
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     * Empty constructor as per the Fragment documentation
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     */
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    public ImageDetailFragment() {}
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    /**
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     * Populate image using a url from extras, use the convenience factory method
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     * {@link ImageDetailFragment#newInstance(String)} to create this fragment.
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     */
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    @Override
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    public void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        mImageUrl = getArguments() != null ? getArguments().getString(IMAGE_DATA_EXTRA) : null;
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    }
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    @Override
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    public View onCreateView(LayoutInflater inflater, ViewGroup container,
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            Bundle savedInstanceState) {
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        // Inflate and locate the main ImageView
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        final View v = inflater.inflate(R.layout.image_detail_fragment, container, false);
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        mImageView = (ImageView) v.findViewById(R.id.imageView);
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        mProgressBar = (ProgressBar) v.findViewById(R.id.progressbar);
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        return v;
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    }
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    @Override
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    public void onActivityCreated(Bundle savedInstanceState) {
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        super.onActivityCreated(savedInstanceState);
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        // Use the parent activity to load the image asynchronously into the ImageView (so a single
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        // cache can be used over all pages in the ViewPager
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        if (ImageDetailActivity.class.isInstance(getActivity())) {
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            mImageFetcher = ((ImageDetailActivity) getActivity()).getImageFetcher();
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            mImageFetcher.loadImage(mImageUrl, mImageView, this);
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        }
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        // Pass clicks on the ImageView to the parent activity to handle
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        if (OnClickListener.class.isInstance(getActivity()) && Utils.hasHoneycomb()) {
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            mImageView.setOnClickListener((OnClickListener) getActivity());
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        }
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    }
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    @Override
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    public void onDestroy() {
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        super.onDestroy();
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        if (mImageView != null) {
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            // Cancel any pending image work
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            ImageWorker.cancelWork(mImageView);
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            mImageView.setImageDrawable(null);
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        }
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    }
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    @Override
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    public void onImageLoaded(boolean success) {
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        // Set loading spinner to gone once image has loaded. Cloud also show
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        // an error view here if needed.
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        mProgressBar.setVisibility(View.GONE);
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    }
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}
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