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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 | import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.lang.ref.SoftReference;import java.net.HttpURLConnection;import java.net.URL;import java.util.HashMap;import java.util.Map; import com.mosjoy.ad.MosJoyAdApplication;import com.mosjoy.ad.R;import com.mosjoy.ad.utils.FileCache;import com.mosjoy.ad.utils.ImageCache;import com.mosjoy.ad.utils.Utils; import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.os.Environment;import android.os.StatFs;import android.util.AttributeSet;import android.util.Log;import android.view.View;import android.widget.ImageView; /** * 图片异步加载工具类 * @author zouyb * */public class RemoteImageView extends ImageView { /** * 下载失败最大重复次数 */ private static int MAX_FAILURES = 3; /** * 下载图片网址 */ private String mUrl; /** * 当前下载成功图片网址 */ private String mCurrentlyGrabbedUrl; /** * 下载失败次数 */ private int mFailure; /** * 默认图片资源id */ private Integer mDefaultImage; /** * 上下文 */ private Context mContext; /** * 文件操作 */ private FileCache fileCache; private final static int MB = 1048576; //图片宽度 private int pwidth=-1; //图片高度 private int pheight=-1; //是否显示默认图片 private boolean isShowDefault=false; public RemoteImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mContext = context; init(); } public RemoteImageView(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; init(); } public RemoteImageView(Context context) { super(context); mContext = context; init(); } /** * Sharable code between constructors */ private void init() { fileCache = new FileCache(mContext); } public void setImageUrl(String url) { System.out.println("width="+pwidth+",height="+pheight); System.out.println("url="+url); if(("").equals(url) || url == null||url.contains("null")){ if(isShowDefault){ setImageResource(R.drawable.default_image); }else{ setVisibility(View.GONE); } return; } setVisibility(View.VISIBLE); url = url.replace("\\", "/"); mUrl = url; MosJoyAdApplication instance = MosJoyAdApplication.getInstance(); ImageCache imageCache = instance.getImageCache(); if (imageCache.isCached(mUrl)) { // 图片在缓存中 this.setImageBitmap(imageCache.get(mUrl).get()); Log.e(MosJoyAdApplication.TAG, "从内存加载图片 " + url); } else { File f = new File(mUrl); Bitmap b = decodeFile(f); if(b != null){ //从内存卡加载 this.setImageBitmap(b); imageCache.put(mUrl,new SoftReference<Bitmap>(b)); Log.e(MosJoyAdApplication.TAG, "从本地加载图片 " + url); }else{ //防止重复下载 //if(YYQMusicApplication.getInstance().getDownLoadImageList().contains(mUrl)) return; //下载图片 Log.e(MosJoyAdApplication.TAG, "从网络下载图片 " + url); Map<String,Object> map = new HashMap<String,Object>(); map.put("url", mUrl); map.put("file", f); try{ new DownloadTask().execute(map); }catch(Exception e){} } } } public void setDefaultImage(Integer resid) { mDefaultImage = resid; } private void loadDefaultImage() { if (mDefaultImage != null) setImageResource(mDefaultImage); } class DownloadTask extends AsyncTask<Map<String, Object>,Void, Bitmap>{ private String mTaskUrl; private File f; @Override public void onPreExecute() { loadDefaultImage(); super.onPreExecute(); } @Override protected Bitmap doInBackground(Map<String, Object>... params) { mTaskUrl = params[0].get("url").toString(); //YYQMusicApplication.getInstance().getDownLoadImageList().add(mTaskUrl); f = (File) params[0].get("file"); try { Bitmap bitmap=null; URL imageUrl = new URL(mTaskUrl); HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection(); conn.setConnectTimeout(30000); conn.setReadTimeout(30000); InputStream is=conn.getInputStream(); OutputStream os = new FileOutputStream(f); Utils.CopyStream(is, os); os.close(); bitmap = decodeFile(f); return bitmap; } catch(FileNotFoundException fileNotFoundException){ fileNotFoundException.printStackTrace(); return null; } catch (Exception ex){ ex.printStackTrace(); } return null; } @Override public void onPostExecute(Bitmap b) { super.onPostExecute(b); if(b == null){ //下载失败，继续下载 //RemoteImageView.this.setImageUrl(mTaskUrl); }else{ //下载成功 MosJoyAdApplication.getInstance().getImageCache().put(mTaskUrl, new SoftReference<Bitmap>(b)); RemoteImageView.this.setImageBitmap(b); mCurrentlyGrabbedUrl = mTaskUrl; } } }; /** * 解码图片 * @param f * @return */ private Bitmap decodeFile(File f) { if(!f.exists()){ return null; } if(pwidth>0&&pheight>0){ System.out.println("加载缩略图"); return decodeFile(f, pwidth, pheight); } try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 1; return BitmapFactory.decodeFile(f.getAbsolutePath(), options); } catch (Exception e) { } return null; } private int freeSpaceOnSd() { StatFs stat = new StatFs(Environment.getExternalStorageDirectory() .getPath()); double sdFreeMB = ((double) stat.getAvailableBlocks() * (double) stat .getBlockSize()) / MB; return (int) sdFreeMB; } private Bitmap decodeFile(File file,int width,int height){ BitmapFactory.Options options=new BitmapFactory.Options(); int scale=1; if(width>0||height>0){ //设置次参数为true，解码时返回的Bitmap为空，不分配内存 options.inJustDecodeBounds=true; BitmapFactory.decodeFile(file.getAbsolutePath(), options); //得到原始图片的宽度和高度 int outWidth=options.outWidth; int outHeight=options.outHeight; while(true){ if((width>0&&outWidth/2<width)||(height>0&&outHeight/2<height)){ break; } outWidth/=2; outHeight/=2; scale*=2; } } //缩放比例为1/scale options.inSampleSize=scale; options.inJustDecodeBounds=false; //处理之后，加载进内存的就是图片的缩略图 return BitmapFactory.decodeFile(file.getAbsolutePath(), options); } public void setPwidth(int pwidth) { this.pwidth = pwidth; } public void setPheight(int pheight) { this.pheight = pheight; } public void setShowDefault(boolean isShowDefault) { this.isShowDefault = isShowDefault; } } |