Al recuperar una imagen de una URL, muestra java.net.UnknownHostException: ¿el host no está resuelto en el dispositivo Android?

Question

public class FetchImageAppsActivity extends Activity { 
/** Called when the activity is first created. */ 
public static String urlPath = "http://farm1.static.flickr.com/150/399390737_7a3d508730_b.jpg"; 
public ImageView imageView; 
boolean usingProxy=true; 
public String proxyIP="A.B.C.D"; 
public int proxyPort=80; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    imageView =(ImageView) findViewById(R.id.imageViewFetch); 

    if(usingProxy==true){ 
    setProxy(); 
    } 
    try { 
     fetch(urlPath); 
    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    Drawable image = ImageOperations(this,urlPath,"overflow.png"); 
    imageView.setImageDrawable(image); 


    /* imageView.setMinimumWidth(); 
    imageView.setMinimumHeight(height); 

    imageView.setMaxWidth(width); 
    imageView.setMaxHeight(height); 
    */ 
} 

private Drawable ImageOperations(Context ctx, String url, String saveFilename) { 
    try { 
     InputStream is = (InputStream) ((FetchImageAppsActivity) ctx).fetch(url); //error line 
     Drawable d = Drawable.createFromStream(is, "src"); 
     return d; 
    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
     return null; 
    } catch (IOException e) { 
     e.printStackTrace(); 
     return null; 
    } 
} 

public Object fetch(String address) throws MalformedURLException,IOException { 
try{ 
    URL url = new URL(address); 
    URI uri = new URI(url.getProtocol(), url.getUserInfo(), url.getHost(), url.getPort(), url.getPath(), url.getQuery(), url.getRef()); 
    url = uri.toURL(); 
    Log.i("Url:", url+""); 
    Object content = url.getContent(); 
    return content; 
    }catch(Exception e){ 
     e.printStackTrace(); 
    } 
    return null; 
    } 

public void setProxy() 
{ Uri uri = Uri.parse("http://farm1.static.flickr.com/150/399390737_7a3d508730_b.jpg"); 
    Properties systemProperties = System.getProperties(); 

    systemProperties.put("proxySet", "true"); 
    systemProperties.setProperty("http.proxyHost",proxyIP); 
    systemProperties.setProperty("http.proxyPort","80"); 
    systemProperties.setProperty("http.nonProxyHosts",uri.getHost()); //uri.getHost() 

HttpHost PROXY_HOST=null; 
if(usingProxy == true) 
    PROXY_HOST = new HttpHost(proxyIP, proxyPort); 
HttpClient client = null; 
File f = null; 
List<BasicNameValuePair> nameValuePairs = new ArrayList<BasicNameValuePair>(2); 
HttpParams params = new BasicHttpParams(); 

params.setParameter(ExecutionContext.HTTP_TARGET_HOST, PROXY_HOST); 

params.setBooleanParameter("http.protocol.expect-continue", false); 
ConnManagerParams.setMaxConnectionsPerRoute(params, new ConnPerRouteBean(1)); 
ConnManagerParams.setMaxTotalConnections(params, 1); 
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); 
HttpProtocolParams.setUseExpectContinue(params, false); 
HttpProtocolParams.setContentCharset(params,HTTP.DEFAULT_CONTENT_CHARSET); 

HttpConnectionParams.setConnectionTimeout(params,50000); 
HttpConnectionParams.setSoTimeout(params, 10000); 
SchemeRegistry registry = new SchemeRegistry(); 

registry.register(new Scheme("https", PlainSocketFactory.getSocketFactory(),443)); 
//if (data != null && data.equals("data")) { 
    registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(),proxyPort)); //uri.getPort() 
    // } else { 
    registry.register(new Scheme("https", PlainSocketFactory.getSocketFactory(), proxyPort)); 
    // } 
ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(params, registry); 
client = new DefaultHttpClient(cm, params); 
//Proxy.NO_PROXY 
if(usingProxy == true) 
    client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, PROXY_HOST); 
HttpContext ctx = new BasicHttpContext(); 
ctx.setAttribute(ExecutionContext.HTTP_TARGET_HOST, PROXY_HOST); 
try { 
    HttpPost request = new HttpPost(); 
    request.setParams(params); 


    request.setURI(new URI(uri.toString())); 
    request.setHeader("Content-Type","application/x-www-form-urlencoded"); 
}catch(Exception e){ 
    System.out.println(e.getMessage()); 
} 
    } 
    } 

llegué a excepción mientras se ejecuta en el emulador de Android y mi máquina está conectada a habilitado proxy de router WiFi como folllows

java.net.UnknownHostException: Host is unresolved: farm1.static.flickr.com:80 

registro de errores:

09-05 13:44:48.817: WARN/System.err(489): java.net.UnknownHostException: Host is unresolved: farm1.static.flickr.com:80 
09-05 13:44:48.839: WARN/System.err(489):  at java.net.Socket.connect(Socket.java:1038) 
09-05 13:44:48.847: WARN/System.err(489):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:62) 
09-05 13:44:48.884: WARN/System.err(489):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:88) 
09-05 13:44:48.886: WARN/System.err(489):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHTTPConnection(HttpURLConnectionImpl.java:927) 
09-05 13:44:48.897: WARN/System.err(489):  at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:909) 
09-05 13:44:48.937: WARN/System.err(489):  at java.net.URLConnection.getContent(URLConnection.java:157) 
09-05 13:44:48.937: WARN/System.err(489):  at java.net.URL.getContent(URL.java:621) 
09-05 13:44:48.967: WARN/System.err(489):  at com.android.fetchimage.FetchImageAppsActivity.fetch(FetchImageAppsActivity.java:96) 
09-05 13:44:48.967: WARN/System.err(489):  at com.android.fetchimage.FetchImageAppsActivity.onCreate(FetchImageAppsActivity.java:62) 
09-05 13:44:48.987: WARN/System.err(489):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
09-05 13:44:48.987: WARN/System.err(489):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
09-05 13:44:48.987: WARN/System.err(489):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
09-05 13:44:48.987: WARN/System.err(489):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
09-05 13:44:48.987: WARN/System.err(489):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
09-05 13:44:48.987: WARN/System.err(489):  at android.os.Handler.dispatchMessage(Handler.java:99) 
09-05 13:44:48.987: WARN/System.err(489):  at android.os.Looper.loop(Looper.java:123) 
09-05 13:44:48.987: WARN/System.err(489):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
09-05 13:44:49.028: WARN/System.err(489):  at java.lang.reflect.Method.invokeNative(Native Method) 
09-05 13:44:49.028: WARN/System.err(489):  at java.lang.reflect.Method.invoke(Method.java:521) 
09-05 13:44:49.028: WARN/System.err(489):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
09-05 13:44:49.047: WARN/System.err(489):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
09-05 13:44:49.067: WARN/System.err(489):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

establecer el permiso androide para Internet en Manifest.xml archivo

android.permission.INTERNET

Answer 2

Prueba el mismo código sin ajustar el propiedad systemProperties.setProperty("http.proxyPort","80");.

Answer 3

Tienes la solución:

String url = "farm1.static.flickr.com/150/399390737_7a3d508730_b.jpg"; proxy = "yourProxyIP", port = "yourProxyPort"; URL server = new URL(url); Properties systemProperties = System.getProperties(); systemProperties.setProperty("http.proxyHost",proxy); systemProperties.setProperty("http.proxyPort",port); HttpURLConnection connection = (HttpURLConnection)server.openConnection(); connection.connect(); InputStream in = connection.getInputStream(); image = Drawable.createFromStream(in, "src"); imageView.setImageDrawable(image);

Para poder utilizar "https" usan la autenticación SSL