Android Open Source - bitmapfun Image Fetcher

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The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright (C) 2012 The Android Open Source Project
 */*from   w  ww. j  a  v  a  2s. 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 com.example.android.bitmapfun.util;

import android.content.Context;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Build;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;

import com.example.android.bitmapfun.util.ImageCache.ImageCacheParams;
import com.example.android.bitampfun.BuildConfig;
import com.example.android.bitampfun.R;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * A simple subclass of {@link ImageResizer} that fetches and resizes images fetched from a URL.
 */
public class ImageFetcher extends ImageWorker {
    private static final String TAG = "ImageFetcher";
    private static final int HTTP_CACHE_SIZE = 24 * 1024 * 1024; // 10MB
    private static final String HTTP_CACHE_DIR = "http";
    private static final int IO_BUFFER_SIZE = 8 * 1024;

    private DiskLruCache mHttpDiskCache;
    private File mHttpCacheDir;
    private boolean mHttpDiskCacheStarting = true;
    private final Object mHttpDiskCacheLock = new Object();
    private static final int DISK_CACHE_INDEX = 0;
    
    private static ImageFetcher sNormalImageFecther;
    private static ImageFetcher sBitImageFetcher;
    
    
    public static void create(Context context){
      ImageFetcher fetcher = new ImageFetcher(context);
      
      ImageCacheParams cacheParams = new ImageCacheParams(context, "imagecaches");
      cacheParams.diskCacheDir=null;//user http cache dir, so disable default cache dir

        cacheParams.setMemCacheSizePercent(0.15f); // Set memory cache to 25% of app memory

        // The ImageFetcher takes care of loading images into our ImageView children asynchronously
        fetcher = new ImageFetcher(context);
        fetcher.addImageCache("vdisk_image_caches", cacheParams);
        sNormalImageFecther = fetcher;
        
        
      cacheParams = new ImageCacheParams(context, "bigimagecaches");
      cacheParams.diskCacheDir=null;//user http cache dir, so disable default cache dir

        cacheParams.setMemCacheSizePercent(0.20f); // Set memory cache to 25% of app memory

        // The ImageFetcher takes care of loading images into our ImageView children asynchronously
        fetcher = new ImageFetcher(context);
        fetcher.addImageCache("vdisk_big_image_caches", cacheParams);
        sBitImageFetcher = fetcher;
    }
    public static ImageFetcher normalFetcher(){
      return sNormalImageFecther;
    }
    
    public static ImageFetcher bigFetcher(){
      return sBitImageFetcher;
    }

    /**
     * Initialize providing a target image width and height for the processing images.
     *
     * @param context
     * @param imageWidth
     * @param imageHeight
     */
    public ImageFetcher(Context context) {
      super(context);
        init(context);
    }

    private void init(Context context) {
        checkConnection(context);
        mHttpCacheDir = ImageCache.getDiskCacheDir(context, HTTP_CACHE_DIR);
    }

    @Override
    protected void initDiskCacheInternal() {
        super.initDiskCacheInternal();
        initHttpDiskCache();
    }

    private void initHttpDiskCache() {
        if (!mHttpCacheDir.exists()) {
            mHttpCacheDir.mkdirs();
        }
        synchronized (mHttpDiskCacheLock) {
            if (ImageCache.getUsableSpace(mHttpCacheDir) > HTTP_CACHE_SIZE) {
                try {
                    mHttpDiskCache = DiskLruCache.open(mHttpCacheDir, 1, 1, HTTP_CACHE_SIZE);
                    if (BuildConfig.DEBUG) {
                        Log.d(TAG, "HTTP cache initialized");
                    }
                } catch (IOException e) {
                    mHttpDiskCache = null;
                }
            }
            mHttpDiskCacheStarting = false;
            mHttpDiskCacheLock.notifyAll();
        }
    }

    @Override
    protected void clearCacheInternal() {
        super.clearCacheInternal();
        synchronized (mHttpDiskCacheLock) {
            if (mHttpDiskCache != null && !mHttpDiskCache.isClosed()) {
                try {
                    mHttpDiskCache.delete();
                    if (BuildConfig.DEBUG) {
                        Log.d(TAG, "HTTP cache cleared");
                    }
                } catch (IOException e) {
                    Log.e(TAG, "clearCacheInternal - " + e);
                }
                mHttpDiskCache = null;
                mHttpDiskCacheStarting = true;
                initHttpDiskCache();
            }
        }
    }

    @Override
    protected void flushCacheInternal() {
        super.flushCacheInternal();
        synchronized (mHttpDiskCacheLock) {
            if (mHttpDiskCache != null) {
                try {
                    mHttpDiskCache.flush();
                    if (BuildConfig.DEBUG) {
                        Log.d(TAG, "HTTP cache flushed");
                    }
                } catch (IOException e) {
                    Log.e(TAG, "flush - " + e);
                }
            }
        }
    }

    @Override
    protected void closeCacheInternal() {
        super.closeCacheInternal();
        synchronized (mHttpDiskCacheLock) {
            if (mHttpDiskCache != null) {
                try {
                    if (!mHttpDiskCache.isClosed()) {
                        mHttpDiskCache.close();
                        mHttpDiskCache = null;
                        if (BuildConfig.DEBUG) {
                            Log.d(TAG, "HTTP cache closed");
                        }
                    }
                } catch (IOException e) {
                    Log.e(TAG, "closeCacheInternal - " + e);
                }
            }
        }
    }

    /**
    * Simple network connection check.
    *
    * @param context
    */
    private void checkConnection(Context context) {
        final ConnectivityManager cm =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        final NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo == null || !networkInfo.isConnectedOrConnecting()) {
            Toast.makeText(context, R.string.no_network_connection_toast, Toast.LENGTH_LONG).show();
            Log.e(TAG, "checkConnection - no connection found");
        }
    }

    @Override
    protected Bitmap processBitmap(BitmapData data) {
        if (BuildConfig.DEBUG) {
            Log.d(TAG, "processBitmap - " + data);
        }

        final String key = ImageCache.hashKeyForDisk(data.getDiskKey());
        FileDescriptor fileDescriptor = null;
        FileInputStream fileInputStream = null;
        DiskLruCache.Snapshot snapshot;
        synchronized (mHttpDiskCacheLock) {
            // Wait for disk cache to initialize
            while (mHttpDiskCacheStarting) {
                try {
                    mHttpDiskCacheLock.wait();
                } catch (InterruptedException e) {}
            }

            if (mHttpDiskCache != null) {
                try {
                    snapshot = mHttpDiskCache.get(key);
                    if (snapshot == null) {
                        if (BuildConfig.DEBUG) {
                            Log.d(TAG, "processBitmap, not found in http cache, downloading...");
                        }

                        final String url = data.getData().toString();
                        if(TextUtils.isEmpty(url))
                          return null;
                        DiskLruCache.Editor editor = mHttpDiskCache.edit(key);
                        if (editor != null) {
                            if (downloadUrlToStream(url,
                                    editor.newOutputStream(DISK_CACHE_INDEX))) {
                                editor.commit();
                            } else {
                                editor.abort();
                            }
                        }
                        snapshot = mHttpDiskCache.get(key);
                    }
                    if (snapshot != null) {
                        fileInputStream =
                                (FileInputStream) snapshot.getInputStream(DISK_CACHE_INDEX);
                        fileDescriptor = fileInputStream.getFD();
                    }
                } catch (IOException e) {
                    Log.e(TAG, "processBitmap - " + e);
                } catch (IllegalStateException e) {
                    Log.e(TAG, "processBitmap - " + e);
                } finally {
                    if (fileDescriptor == null && fileInputStream != null) {
                        try {
                            fileInputStream.close();
                        } catch (IOException e) {}
                    }
                }
            }
        }

        Bitmap bitmap = null;
        if (fileDescriptor != null) {
            bitmap = BitmapUtils.decodeSampledBitmapFromDescriptor(fileDescriptor, 
                data.getDesiredWidth(),
                    data.getDesiredHeight(), 
                    getImageCache());
        }
        if (fileInputStream != null) {
            try {
                fileInputStream.close();
            } catch (IOException e) {}
        }
        return bitmap;
    }

    /**
     * Download a bitmap from a URL and write the content to an output stream.
     *
     * @param urlString The URL to fetch
     * @return true if successful, false otherwise
     */
    public boolean downloadUrlToStream(String urlString, OutputStream outputStream) {
        disableConnectionReuseIfNecessary();
        HttpURLConnection urlConnection = null;
        BufferedOutputStream out = null;
        BufferedInputStream in = null;

        try {
          Log.d(TAG, "downloadUrlToStream: "+urlString);
            final URL url = new URL(urlString);
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setConnectTimeout(10*1000);
            urlConnection.setReadTimeout(10*1000);
            in = new BufferedInputStream(urlConnection.getInputStream(), IO_BUFFER_SIZE);
            out = new BufferedOutputStream(outputStream, IO_BUFFER_SIZE);

            int b;
            while ((b = in.read()) != -1) {
                out.write(b);
            }
            return true;
        } catch (final IOException e) {
            Log.e(TAG, "Error in downloadBitmap - " + e);
            e.printStackTrace();
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (final IOException e) {}
        }
        return false;
    }

    /**
     * Workaround for bug pre-Froyo, see here for more info:
     * http://android-developers.blogspot.com/2011/09/androids-http-clients.html
     */
    public static void disableConnectionReuseIfNecessary() {
        // HTTP connection reuse which was buggy pre-froyo
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO) {
            System.setProperty("http.keepAlive", "false");
        }
    }
}
Java Source Code List
