我想从Http url下载图像并在加载后保存到SD卡并显示到图像视图中.我试过从
android-hive的
Image-loader教程使用我的http url加载图像,但运行后的图像无法加载和显示.应用程序没有崩溃,但获得错误异常java.net.SocketTimeoutException：在ImageLoader类30000ms后无法连接到/103.24.4.60(端口80)
这是我的日志信息
09-30 02:32:15.820 18371-18389/? W/System.err﹕ java.net.SocketTimeoutException: Failed to connect to /103.24.4.60 (port 80) after 30000ms 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at libcore.io.IoBridge.connectErrno(IoBridge.java:169) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:122) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at java.net.Socket.connect(Socket.java:882) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.internal.Platform.connectSocket(Platform.java:139) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.Connection.connect(Connection.java:148) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:373) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:190) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.example.tazeen.imgloader.ImageLoader.getBitmap(ImageLoader.java:73) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.example.tazeen.imgloader.ImageLoader.access$000(ImageLoader.java:23) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at com.example.tazeen.imgloader.ImageLoader$PhotosLoader.run(ImageLoader.java:134) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422) 09-30 02:32:15.820 18371-18389/? W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237) 09-30 02:32:15.821 18371-18389/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 09-30 02:32:15.821 18371-18389/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 09-30 02:32:15.821 18371-18389/? W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
这是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(30000);
conn.setReadTimeout(30000);
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),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();
}
}
解决方法
有两种可能性：
1)您检查并测试了您的连接.
1)您检查并测试了您的连接.
2)最好不要设置任何连接超时,如果你设置选择最大时间,因为如果服务器在给定时间内没有响应它会抛出错误.
所以你可以使用
HttpUrlConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(7000);
或者你可以使用
for (int retries = 0; retries < 3; retries++) {
try {
final HttpClient client = createHttpClientWithDefaultSocketFactory(null,null);
final HttpResponse response = client.execute(get);
final int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
throw new IllegalStateException("GET Request on '" + get.getURI().toString() + "' resulted in " + statusCode);
} else {
return response.getEntity();
}
} catch (final java.net.SocketTimeoutException e) {
// connection timed out...let's try again
}
}
希望所以它会帮助你,享受你的代码:)
