我使用這個代碼從Web檢索位圖給出未知的主機異常?
try {
Bitmap bitmap=null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
InputStream is=conn.getInputStream(); ///Error is pointing me here
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Exception ex){
ex.printStackTrace();
return null;
}
唯一的問題得到一個位圖是我不斷收到這個errror。每一次我嘗試獲取位圖。 錯誤在這裏指點我:很顯然
InputStream is=conn.getInputStream();
09-30 06:54:32.512: WARN/System.err(11149): at java.net.InetAddress.lookupHostByName(InetAddress.java:497)
09-30 06:54:32.512: WARN/System.err(11149): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:294)
09-30 06:54:32.512: WARN/System.err(11149): at java.net.InetAddress.getAllByName(InetAddress.java:256)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.retrieveResponse(HttpURLConnectionImpl.java:1018)
09-30 06:54:32.512: WARN/System.err(11149): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:512)
檢查是您的瀏覽器在模擬器中工作...有時您的瀏覽器停止工作在模擬器,使Uknownhostexception ... –