我在使用ImageLoader从SD卡显示图像时出现MalformedURLException，它出现错误 java.net.MalformedURLException：找不到协议：/storage/emulated/0/classnkk_images/3_20150928162260013.png 。可以将SD卡路径传递给imageloader。
Log Cat
09-30 06:40:24.056 14267-14343/? W/System.err﹕ java.net.MalformedURLException: Protocol not found: /storage/emulated/0/classnkk_images/3_20150928162260013.png
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.net.URL.<init>(URL.java:176)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.net.URL.<init>(URL.java:125)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at com.example.tazeen.classnkk.ImageLoader.getBitmap(ImageLoader.java:68)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at com.example.tazeen.classnkk.ImageLoader.access$000(ImageLoader.java:23)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at com.example.tazeen.classnkk.ImageLoader$PhotosLoader.run(ImageLoader.java:134)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
09-30 06:40:24.056 14267-14343/? W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
这是我的ImageLoader类
public class ImageLoader {
MemoryCache memoryCache=new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews= Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
public ImageLoader(Context context){
fileCache=new FileCache(context);
executorService= Executors.newFixedThreadPool(5);
}
int stub_id = R.drawable.ic_launcher;
public void DisplayImage(String url, int loader, ImageView imageView)
{
stub_id = loader;
imageViews.put(imageView, url);
Bitmap bitmap=memoryCache.get(url);
if(bitmap!=null)
imageView.setImageBitmap(bitmap);
else
{
queuePhoto(url, imageView);
imageView.setImageResource(loader);
}
}
private void queuePhoto(String url, ImageView imageView)
{
PhotoToLoad p=new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url)
{
File f=fileCache.getFile(url);
//from SD cache
Bitmap b = decodeFile(f);
if(b!=null)
return b;
//from web
try {
Bitmap bitmap=null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
conn.setConnectTimeout(8000);
conn.setReadTimeout(8000);
conn.setInstanceFollowRedirects(true);
InputStream is=conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Exception ex){
ex.printStackTrace();
return null;
}
}
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
//decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
//Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE=70;
int width_tmp=o.outWidth, height_tmp=o.outHeight;
int scale=1;
while(true){
if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
break;
width_tmp/=2;
height_tmp/=2;
scale*=2;
}
//decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
//Task for the queue
private class PhotoToLoad
{
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i){
url=u;
imageView=i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad){
this.photoToLoad=photoToLoad;
}
@Override
public void run() {
if(imageViewReused(photoToLoad))
return;
Bitmap bmp=getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if(imageViewReused(photoToLoad))
return;
BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
Activity a=(Activity)photoToLoad.imageView.getContext();
a.runOnUiThread(bd);
}
}
boolean imageViewReused(PhotoToLoad photoToLoad){
String tag=imageViews.get(photoToLoad.imageView);
if(tag==null || !tag.equals(photoToLoad.url))
return true;
return false;
}
//Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable
{
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
public void run()
{
if(imageViewReused(photoToLoad))
return;
if(bitmap!=null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
答案 0 :(得分：0)
似乎你的网址格式错误 - 正如错误所说的那样。
因此，请检查您是否有正确的URL
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MalformedURLException in android when downloading a zip file