Bild von Server mit Android herunterladen

Question

Ich versuche ein Bild aus dem Internet herunterzuladen. Momentan lädt die App nur einen Teil des Bildes herunter, stoppt dann aber. Ich verwende AsyncTask. Irgendwelche Vorschläge, was zu tun ist?

Der Fehler, den ich bekommen ist:

android.os.NetworkOnMainThreadException 
at com.example.reynaldo.getimageserver.MainActivity$DownloadAsyncTask.onPostExecute(MainActivity.java:74) 
W/System.err:  at com.example.reynaldo.getimageserver.MainActivity$DownloadAsyncTask.onPostExecute(MainActivity.java:30) 

Dies ist der Code ich habe:

import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.ImageView; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLConnection; 

public class MainActivity extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
} 

public void onClick (View view){ 
    DownloadAsyncTask task = new DownloadAsyncTask(); 
    task.execute(new String[] {"http://res.cloudinary.com/demo/image/upload/w_500,f_auto/sample.jpg" }); 
} 

private class DownloadAsyncTask extends AsyncTask<String, Void, String> { 


    Bitmap bitmap = null; 
    InputStream in = null; 

    @Override 
    protected String doInBackground(String... urls){ 


     int response = -1; 
     URL url; 

     try { 
      url = new URL("http://res.cloudinary.com/demo/image/upload/w_500,f_auto/sample.jpg"); 

     URLConnection conn = url.openConnection(); 

     if (!(conn instanceof HttpURLConnection)) 
      System.out.println("This is wrong"); 


     HttpURLConnection httpConn = (HttpURLConnection) conn; 
     httpConn.setAllowUserInteraction(false); 
     httpConn.setInstanceFollowRedirects(true); 
     httpConn.setRequestMethod("GET"); 
     httpConn.connect(); 

     response = httpConn.getResponseCode(); 
     if (response == HttpURLConnection.HTTP_OK) { 
      in = httpConn.getInputStream(); 
      return "success"; 
     } 
     } 

    catch (IOException e) { 
     System.out.println("IOException"); 
    } 
     return "Download failed"; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     //try { 
      bitmap = BitmapFactory.decodeStream(in); 
     /* in.close(); 
     } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     }*/ 
     ImageView img = (ImageView) findViewById(R.id.image); 

     img.setImageBitmap(bitmap); 
    } 

} 

}

Answer 1

dies versuchen, wenn Sie Dritte nicht Bibliothek

verwenden möchten

 new DownloadImage(Imageview).execute(YourUrl); 

erstellen AsyncTask Klasse

public class DownloadImage extends AsyncTask<String, Void, Bitmap> { 
    CircleImageView bmImage; 

    public DownloadImage(ImageView bmImage) { 
     this.bmImage = (CircleImageView) bmImage; 
    } 

    protected Bitmap doInBackground(String... urls) { 
     String urldisplay = urls[0]; 
     Bitmap mIcon11 = null; 
     try { 
      InputStream in = new java.net.URL(urldisplay).openStream(); 
      mIcon11 = BitmapFactory.decodeStream(in); 
     } catch (Exception e) { 
      Log.d("Error", e.getStackTrace().toString()); 

     } 
     return mIcon11; 
    } 

    protected void onPostExecute(Bitmap result) { 
     bmImage.setImageBitmap(result); 
    } 
}