/*
* Copyright (C) 2009 Google Inc.
*
* 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.ch_linghu.fanfoudroid.app;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.util.Log;
import com.ch_linghu.fanfoudroid.AppParam;
import com.ch_linghu.fanfoudroid.http.HttpException;
import com.ch_linghu.fanfoudroid.http.Response;
/**
* Manages retrieval and storage of icon images. Use the put method to download
* and store images. Use the get method to retrieve images from the manager.
*/
public class ImageManager implements ImageCache {
private static final String TAG = "ImageManager";
// 饭否目前最大宽度支持596px, 超过则同比缩小
// 最大高度为1192px, 超过从中截取
public static final int DEFAULT_COMPRESS_QUALITY = 90;
public static final int IMAGE_MAX_WIDTH = 596;
public static final int IMAGE_MAX_HEIGHT = 1192;
private Context mContext;
// In memory cache.
private Map<String, SoftReference<Bitmap>> mCache;
// MD5 hasher.
private MessageDigest mDigest;
public static Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap = Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}
public ImageManager(Context context) {
mContext = context;
mCache = new HashMap<String, SoftReference<Bitmap>>();
try {
mDigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
// This shouldn't happen.
throw new RuntimeException("No MD5 algorithm.");
}
}
public void setContext(Context context) {
mContext = context;
}
private String getHashString(MessageDigest digest) {
StringBuilder builder = new StringBuilder();
for (byte b : digest.digest()) {
builder.append(Integer.toHexString((b >> 4) & 0xf));
builder.append(Integer.toHexString(b & 0xf));
}
return builder.toString();
}
// MD5 hases are used to generate filenames based off a URL.
private String getMd5(String url) {
mDigest.update(url.getBytes());
return getHashString(mDigest);
}
// Looks to see if an image is in the file system.
private Bitmap lookupFile(String url) {
String hashedUrl = getMd5(url);
FileInputStream fis = null;
try {
fis = mContext.openFileInput(hashedUrl);
return BitmapFactory.decodeStream(fis);
} catch (FileNotFoundException e) {
// Not there.
return null;
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
// Ignore.
}
}
}
}
/**
* Downloads a file
*
* @param url
* @return
* @throws HttpException
*/
public Bitmap downloadImage(String url) throws HttpException {
Log.d(TAG, "Fetching image: " + url);
Response res = AppParam.mApi.getHttpClient().get(url);
return BitmapFactory.decodeStream(new BufferedInputStream(res
.asStream()));
}
public Bitmap downloadImage2(String url) throws HttpException {
Log.d(TAG, "[NEW]Fetching image: " + url);
final Response res = AppParam.mApi.getHttpClient().get(url);
String file = writeToFile(res.asStream(), getMd5(url));
return BitmapFactory.decodeFile(file);
}
/**
* 下载远程图片 -> 转换为Bitmap -> 写入缓存器.
*
* @param url
* @param quality
* image quality 1～100
* @throws HttpException
*/
public void put(String url, int quality, boolean forceOverride)
throws HttpException {
if (!forceOverride && contains(url)) {
// Image already exists.
return;
// TODO: write to file if not present.
}
Bitmap bitmap = downloadImage(url);
if (bitmap != null) {
put(url, bitmap, quality); // file cache
} else {
Log.w(TAG, "Retrieved bitmap is null.");
}
}
/**
* 重载 put(String url, int quality)
*
* @param url
* @throws HttpException
*/
public void put(String url) throws HttpException {
put(url, DEFAULT_COMPRESS_QUALITY, false);
}
/**
* 将本地File -> 转换为Bitmap -> 写入缓存器. 如果图片大小超过MAX_WIDTH/MAX_HEIGHT, 则将会对图片缩放.
*
* @param file
* @param quality
* 图片质量(0~100)
* @param forceOverride
* @throws IOException
*/
public void put(File file, int quality, boolean forceOverride)
throws IOException {
if (!file.exists()) {
Log.w(TAG, file.getName() + " is not exists.");
return;
}
if (!forceOverride && contains(file.getPath())) {
// Image already exists.
Log.d(TAG, file.getName() + " is exists");
return;
// TODO: write to file if not present.
}
Bitmap bitmap = BitmapFactory.decodeFile(file.getPath());
// bitmap = resizeBitmap(bitmap, MAX_WIDTH, MAX_HEIGHT);
if (bitmap == null) {
Log.w(TAG, "Retrieved bitmap is null.");
} else {
put(file.getPath(), bitmap, quality);
}
}
/**
* 将Bitmap写入缓存器.
*
* @param filePath
* file path
* @param bitmap
* @param quality
* 1~100
*/
public void put(String file, Bitmap bitmap, int quality) {
synchronized (this) {
mCache.put(file, new SoftReference<Bitmap>(bitmap));
}
writeFile(file, bitmap, quality);
}
/**
* 重载 put(String file, Bitmap bitmap, int quality)
*
* @param filePath
* file path
* @param bitmap
* @param quality
* 1~100
*/
@Override
public void put(String file, Bitmap bitmap) {
put(file, bitmap, DEFAULT_COMPRESS_QUALITY);
}
/**
* 将Bitmap写入本地缓存文件.
*
* @param file
* URL/PATH
* @param bitmap
* @param quality
*/
private void writeFile(String file, Bitmap bitmap, int quality) {
if (bitmap == null) {
Log.w(TAG, "Can't write file. Bitmap is null.");
return;
}
BufferedOutputStream bos = null;
try {
String hashedUrl = getMd5(file);
bos = new BufferedOutputStream(mContext.openFileOutput(hashedUrl,
Context.MODE_PRIVATE));
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, bos); // PNG
Log.d(TAG, "Writing file: " + file);
} catch (IOException ioe) {
Log.e(TAG, ioe.getMessage());
} finally {
try {
if (bos != null) {
bitmap.recycle();
bos.flush();
bos.close();
}
// bitmap.recycle();
} catch (IOException e) {
Log.e(TAG, "Could not close file.");
}
}
}
private String writeToFile(InputStream is, String filename) {
Log.d("LDS", "new write to file");
BufferedInputStream in = null;
BufferedOutputStream out = null;
try {
in = new BufferedInputStream(is);
out = new BufferedOutputStream(mContext.openFileOutput(filename,
Context.MODE_PRIVATE));
byte[] buffer = new byte[1024];
int l;
while ((l = in.read(buffer)) != -1) {
out.write(buffer, 0, l);
}
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
try {
if (in != null)
in.close();
if (out != null) {
Log.d("LDS", "new write to file to -> " + filename);
out.flush();
out.close();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return mContext.getFilesDir() + "/" + filename;
}
public Bitmap get(File file) {
return get(file.getPath());
}
/**
* 判断缓存着中是否存在该文件对应的bitmap
*/
public boolean isContains(String file) {
return mCache.containsKey(file);
}
/**
* 获得指定file/URL对应的Bitmap，首先找本地文件，如果有直接使用，否则去网上获取
*
* @param file
* file URL/file PATH
* @param bitmap
* @param quality
* @throws HttpException
*/
public Bitmap safeGet(String file) throws HttpException {
Bitmap bitmap = lookupFile(file); // first try file.
if (bitmap != null) {
synchronized (this) { // memory cache
mCache.put(file, new SoftReference<Bitmap>(bitmap));
}
return bitmap;
} else { // get from web
String url = file;
bitmap = downloadImage2(url);
// 注释掉以测试新的写入文件方法
// put(file, bitmap); // file Cache
return bitmap;
}
}
/**
* 从缓存器中读取文件
*
* @param file
* file URL/file PATH
* @param bitmap
* @param quality
*/
public Bitmap get(String file) {
SoftReference<Bitmap> ref;
Bitmap bitmap;
// Look in memory first.
synchronized (this) {
ref = mCache.get(file);
}
if (ref != null) {
bitmap = ref.get();
if (bitmap != null) {
return bitmap;
}
}
// Now try file.
bitmap = lookupFile(file);
if (bitmap != null) {
synchronized (this) {
mCache.put(file, new SoftReference<Bitmap>(bitmap));
}
return bitmap;
}
// TODO: why?
// upload: see profileImageCacheManager line 96
Log.w(TAG, "Image is missing: " + file);
// return the default photo
return mDefaultBitmap;
}
public boolean contains(String url) {
return get(url) != mDefaultBitmap;
}
public void clear() {
String[] files = mContext.fileList();
for (String file : files) {
mContext.deleteFile(file);
}
synchronized (this) {
mCache.clear();
}
}
public void cleanup(HashSet<String> keepers) {
String[] files = mContext.fileList();
HashSet<String> hashedUrls = new HashSet<String>();
for (String imageUrl : keepers) {
hashedUrls.add(getMd5(imageUrl));
}
for (String file : files) {
if (!hashedUrls.contains(file)) {
Log.d(TAG, "Deleting unused file: " + file);
mContext.deleteFile(file);
}
}
}
/**
* Compress and resize the Image
*
* <br />
* 因为不论图片大小和尺寸如何, 饭否都会对图片进行一次有损压缩, 所以本地压缩应该 考虑图片将会被二次压缩所造成的图片质量损耗
*
* @param targetFile
* @param quality
* , 0~100, recommend 100
* @return
* @throws IOException
*/
public File compressImage(File targetFile, int quality) throws IOException {
String filepath = targetFile.getAbsolutePath();
// 1. Calculate scale
int scale = 1;
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filepath, o);
if (o.outWidth > IMAGE_MAX_WIDTH || o.outHeight > IMAGE_MAX_HEIGHT) {
scale = (int) Math.pow(
2.0,
(int) Math.round(Math.log(IMAGE_MAX_WIDTH
/ (double) Math.max(o.outHeight, o.outWidth))
/ Math.log(0.5)));
// scale = 2;
}
Log.d(TAG, scale + " scale");
// 2. File -> Bitmap (Returning a smaller image)
o.inJustDecodeBounds = false;
o.inSampleSize = scale;
Bitmap bitmap = BitmapFactory.decodeFile(filepath, o);
// 2.1. Resize Bitmap
// bitmap = resizeBitmap(bitmap, IMAGE_MAX_WIDTH, IMAGE_MAX_HEIGHT);
// 3. Bitmap -> File
writeFile(filepath, bitmap, quality);
// 4. Get resized Image File
String filePath = getMd5(targetFile.getPath());
File compressedImage = mContext.getFileStreamPath(filePath);
return compressedImage;
}
/**
* 保持长宽比缩小Bitmap
*
* @param bitmap
* @param maxWidth
* @param maxHeight
* @param quality
* 1~100
* @return
*/
public Bitmap resizeBitmap(Bitmap bitmap, int maxWidth, int maxHeight) {
int originWidth = bitmap.getWidth();
int originHeight = bitmap.getHeight();
// no need to resize
if (originWidth < maxWidth && originHeight < maxHeight) {
return bitmap;
}
int newWidth = originWidth;
int newHeight = originHeight;
// 若图片过宽, 则保持长宽比缩放图片
if (originWidth > maxWidth) {
newWidth = maxWidth;
double i = originWidth * 1.0 / maxWidth;
newHeight = (int) Math.floor(originHeight / i);
bitmap = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight,
true);
}
// 若图片过长, 则从中部截取
if (newHeight > maxHeight) {
newHeight = maxHeight;
int half_diff = (int) ((originHeight - maxHeight) / 2.0);
bitmap = Bitmap.createBitmap(bitmap, 0, half_diff, newWidth,
newHeight);
}
Log.d(TAG, newWidth + " width");
Log.d(TAG, newHeight + " height");
return bitmap;
}
}