Konvertieren von URL zu Bitmap in Android

Question

Ich entwickle eine Android App. In meiner App muss ich URL in Bitmap konvertieren. Ich habe online gesucht und Code im Stackoverflow gefunden. Ich habe es gerade benutzt. Aber es funktioniert nicht. Es gibt mir einen Fehler.

Das ist meine convert Methode

public final class CommonHelper{ 
    public static Bitmap ConvertUrlToBitmap(String src) 
    { 
     try { 
      URL url = new URL(src); 
      HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
      connection.setDoInput(true); 
      connection.connect(); 
      InputStream input = connection.getInputStream(); 
      Bitmap myBitmap = BitmapFactory.decodeStream(input); 
      return myBitmap; 
     } catch (IOException e) { 
      e.printStackTrace(); 
      return null; 
     } 
    } 
} 

Also, wenn ich diese Methode in Tätigkeit zu verwenden, es gibt mir Fehler. Dies ist der Fehler in logcat.

Dies ist der Fehler

05-05 17:41:16.674 10095-10101/? E/jdwp: Failed sending reply to debugger: Broken pipe 
05-05 17:41:16.674 10095-10101/? D/dalvikvm: Debugger has detached; object registry had 1 entries 
05-05 17:41:16.770 10095-10095/? W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;) 
05-05 17:41:16.770 10095-10095/? I/dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.view.WindowCallbackWrapper.onSearchRequested 
05-05 17:41:16.770 10095-10095/? W/dalvikvm: VFY: unable to resolve interface method 18254: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z 
05-05 17:41:16.770 10095-10095/? D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002 
05-05 17:41:16.770 10095-10095/? I/dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode 
05-05 17:41:16.770 10095-10095/? W/dalvikvm: VFY: unable to resolve interface method 18258: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode; 
05-05 17:41:16.770 10095-10095/? D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002 
05-05 17:41:16.782 10095-10098/? D/dalvikvm: GC_CONCURRENT freed 169K, 12% free 2684K/3020K, paused 2ms+0ms, total 5ms 
05-05 17:41:16.786 10095-10095/? I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead. 
05-05 17:41:16.786 10095-10095/? I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.widget.TintTypedArray.getChangingConfigurations 
05-05 17:41:16.786 10095-10095/? W/dalvikvm: VFY: unable to resolve virtual method 522: Landroid/content/res/TypedArray;.getChangingConfigurations()I 
05-05 17:41:16.786 10095-10095/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002 
05-05 17:41:16.790 10095-10095/? I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.widget.TintTypedArray.getType 
05-05 17:41:16.790 10095-10095/? W/dalvikvm: VFY: unable to resolve virtual method 544: Landroid/content/res/TypedArray;.getType (I)I 
05-05 17:41:16.790 10095-10095/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002 
05-05 17:41:16.798 10095-10095/? D/dalvikvm: GC_FOR_ALLOC freed 37K, 10% free 2814K/3120K, paused 3ms, total 3ms 
05-05 17:41:16.798 10095-10095/? I/dalvikvm-heap: Grow heap (frag case) to 3.981MB for 1127532-byte allocation 
05-05 17:41:16.802 10095-10104/? D/dalvikvm: GC_FOR_ALLOC freed <1K, 8% free 3914K/4224K, paused 3ms, total 3ms 
05-05 17:41:16.806 10095-10098/? D/dalvikvm: GC_CONCURRENT freed <1K, 8% free 3914K/4224K, paused 0ms+0ms, total 2ms 
05-05 17:41:16.834 10095-10098/? D/dalvikvm: GC_CONCURRENT freed 159K, 8% free 4153K/4480K, paused 2ms+0ms, total 5ms 
05-05 17:41:16.846 10095-10095/? I/CURRENT_LANGUAGE: 1 
05-05 17:41:16.850 10095-10095/? D/AndroidRuntime: Shutting down VM 
05-05 17:41:16.850 10095-10095/? W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa4b60648) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime: FATAL EXCEPTION: main 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.blog.waiyanhein.mmfashion.mmfashion/com.blog.waiyanhein.mmfashion.mmfashion.MainActivity}: android.os.NetworkOnMainThreadException 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:137) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5103) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:525) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime: Caused by: android.os.NetworkOnMainThreadException 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.io.IoBridge.connect(IoBridge.java:112) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.net.Socket.connect(Socket.java:842) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpConnection.connect(HttpConnection.java:128) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpEngine.connect(HttpEngine.java:311) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.blog.waiyanhein.mmfashion.model.CommonHelper.ConvertUrlToBitmap(CommonHelper.java:595) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.blog.waiyanhein.mmfashion.mmfashion.MainActivity.addCategoriesToMenu(MainActivity.java:345) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.blog.waiyanhein.mmfashion.mmfashion.MainActivity.bindCategoryMenu(MainActivity.java:376) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.blog.waiyanhein.mmfashion.mmfashion.MainActivity.onCreate(MainActivity.java:101) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.Activity.performCreate(Activity.java:5133) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.access$600(ActivityThread.java:141)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:99)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:137)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5103)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:525)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)  
05-05 17:41:16.850 10095-10095/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method)  

Also bitte, warum ist das passiert und wie kann ich das Problem lösen? Wie kann ich URL zu Bitmap konvertieren?

Ich habe auch versucht, auf diese Weise

public static Bitmap ConvertUrlToBitmap(String src) 
    { 
     try{ 
      URL url = new URL(src); 
      Bitmap image = BitmapFactory.decodeStream(url.openConnection().getInputStream()); 
      return image; 
     } 
     catch (IOException e) 
     { 
      return null; 
     } 
    } 

Answer 1

Sie versuchen, eine netzwerkintensive Aufgabe in Ihrem Hauptthread auszuführen (was dazu führen kann, dass die Benutzeroberfläche nicht aktualisiert wird - darum beschwert sich Android).

Sie sollten eine AsyncTask starten, die Sie verwenden können, um Ihr Bild herunterzuladen und in dedizierter Rückrufmethode zurückzukehren.

Für solche Fälle verwende ich persönlich Picasso Bibliothek. Mit diesem Tool können Sie Ihr Problem auf nur wenige Schritte vereinfachen, wie beschrieben here.

Answer 2

Sie versuchen, eine Online-Verbindung und Netzwerk-Aufgabe. Alle Netzwerkaufgaben müssen in einem separaten Thread ausgeführt werden.

Geben Sie diesem einen Versuch:

private Bitmap bitmap; 

private class ConvertUrlToBitmap extends AsyncTask<String, Long, Boolean> { 
    @Override 
    protected Boolean doInBackground(String... params) { 
     try { 
      URL url = new URL(params[0]); 
      bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream()); 
      return true; 
     } catch (Exception e) { 
      Log.e(TAG, e.toString()); 
      return false; 
     } 
    } 

    @Override 
    protected void onPostExecute(Boolean aBoolean) { 
     super.onPostExecute(aBoolean); 
     if(aBoolean) { 
      // download was successful 
      // if you want to update your UI, make sure u do it on main thread. like this: 
      MyActivity.this.runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        // update UI here 
       } 
      }); 
     } else { 
      // download failed 
     } 
    } 
} 

dann auf Ihre Schaltfläche klicken oder wenn Sie es herunterladen möchten, diese rufen Sie einfach an:

new ConvertUrlToBitmap().execute(src); 

hoffe, das hilft!

Answer 3

Schreiben Sie den folgenden Code in Ihre Aktivitätsdatei nach setContentView(R.layout.activity_your);

if (android.os.Build.VERSION.SDK_INT > 9) { 
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
    StrictMode.setThreadPolicy(policy); 
} 

Und unter Import-Anweisung in Ihre Java-Datei.

import android.os.StrictMode; 

Answer 4

versuchen Sie Ihren Code in eine Thread.

Und ich denke, Sie WebView können URL Bild anzuzeigen:

webView.loadUrl(urlImage) 

Answer 5

Verwenden AsyncTask für diesen Zweck. Sie können dies versuchen.

class GetImage extends AsyncTask<String, Void, Bitmap> { 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
    } 

    public Bitmap doInBackground(String... urls) { 
     Bitmap map = null; 
     try { 
      URL url = new URL(urls[0]); 
      HttpURLConnection connection =(HttpURLConnection)url.openConnection(); 
      connection.setDoInput(true); 
      connection.connect(); 
      InputStream input = connection.getInputStream(); 
      map= BitmapFactory.decodeStream(input); 


     } catch (Exception e) { 

      e.printStackTrace(); 

     } 

     return map; 
    } 

    protected void onPostExecute(Bitmap bMap) { 


     try { 
      if (!isCancelled()) { 
       if (bMap != null) { 
        //set your image view here. 

       } 
      } 
     }catch (Exception exception){ 
     exception.printStackTrace(); 
     } 
    } 

}