ListView의 ImageView입니다. 앨범 아트 받기

Question

저는 ListView에 위치한 ImageView에 AlbumArt를 넣으려고합니다. 왜 첫 번째 예제가 작동하는지 알 수 없으며 다른 조각에 ImageView에 비트 맵을 넣을 수 있지만 비트 맵을 listview에 넣을 수 없습니다. 어댑터 코드 :

BookFragment.mAlbumArt.setImageBitmap(bitmap);' 

하는 작업과 'BookFragment'되어

코드를

public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) { 
View view = inflater.inflate(R.layout.library, parent, false); 

    ListView lvLibList = (ListView)view.findViewById(R.id.lvLibList); 
    ImageButton btAddItem = (ImageButton)view.findViewById(R.id.btAddItem); 
    lvLibList.setAdapter(adapter); 
    final ImageView ivListAlbumArt = (ImageView)view.findViewById(R.id.ivListAlbumArt); 
    mBooks = BookLib.get(getActivity()).getBooks(); 

    lvLibList.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     public void onItemClick(AdapterView<?> parent, View view, 
           int position, long id) { 

      Book b = (Book)parent.getAdapter().getItem(position); 
      String fn = b.getBookFileName(); 
      Log.d(LOG_TAG, fn); 

      musicSrv.releaseMedia(); 
      musicSrv.initMediaPlayer(); 
      musicSrv.setMedia(fn); 
      musicSrv.createMedia(); 
      musicSrv.playNewMedia(); 
      BookFragment.mFileName.setText(musicSrv.getMediaTitle()); 


      byte[] art = musicSrv.getMediaAlbumArt(); 
      if(art != null) 
      { 
       Bitmap bitmap = BitmapFactory.decodeByteArray(art, 0, art.length); 
       BookFragment.mAlbumArt.setImageBitmap(bitmap); 
       BookFragment.mAlbumArt.setAdjustViewBounds(true); 
       BookFragment.mAlbumArt.setLayoutParams(new LinearLayout.LayoutParams(800, 800)); 

       ivListAlbumArt.setImageBitmap(bitmap); 
       ivListAlbumArt.setAdjustViewBounds(true); 
       ivListAlbumArt.setLayoutParams(new LinearLayout.LayoutParams(80, 80)); 
      } 
      else 
      { 
       BookFragment.mAlbumArt.setImageResource(R.drawable.thevoice); 
       BookFragment.mAlbumArt.setAdjustViewBounds(true); 
       BookFragment.mAlbumArt.setLayoutParams(new LinearLayout.LayoutParams(800, 800)); 

       ivListAlbumArt.setImageResource(R.drawable.thevoice); 
       ivListAlbumArt.setAdjustViewBounds(true); 
       ivListAlbumArt.setLayoutParams(new LinearLayout.LayoutParams(80, 80)); 
      } 
     } 
    }); 

    BookAdapter bookAdapter = new BookAdapter(mBooks); 
    lvLibList.setAdapter(bookAdapter); 

    btAddItem.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      OpenFileDialog fileDialog = new OpenFileDialog(getActivity()); 
      fileDialog.show(); 
     } 
    }); 

    return view; 
} 

UPD를 작동하지 않는 다른 조각

ivListAlbumArt.setImageBitmap(bitmap); 

입니다. Adapter에 ImageView를 업데이트하는 코드를 추가 할 수 있습니까?

private class BookAdapter extends ArrayAdapter<Book> { 
    public BookAdapter(ArrayList<Book> books) { 
     super(getActivity(),0,books); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (convertView == null) { 
      convertView = getActivity().getLayoutInflater().inflate(R.layout.list_item, null); 
     } 
     Book b = getItem(position); 
     TextView tvTitle = (TextView)convertView.findViewById(R.id.tvFileName); 
     TextView tvPath = (TextView)convertView.findViewById(R.id.tvFilePath); 
     TextView tvListDuration = (TextView)convertView.findViewById(R.id.tvListDuration); 
     ImageView ivListAlbumArt = (ImageView)convertView.findViewById(R.id.ivListAlbumArt); 
     tvTitle.setText(b.getTitle()); 
     tvPath.setText(b.getBookAutor()); 
     return convertView; 
    } 
} 

어댑터 XML

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
> 


<ImageView 
    android:layout_width="54dp" 
    android:layout_height="54dp" 
    android:layout_weight="0" 
    android:id="@+id/ivListAlbumArt" 
    android:padding="3dp" 
    android:src="@drawable/logo" /> 

<TextView 
    android:id="@+id/tvFileName" 
    android:text="FileName will be here" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_weight="0" 
    android:padding="5dp" 
    android:textStyle="bold" 
    android:layout_toRightOf="@id/ivListAlbumArt" 
    android:layout_gravity="center_horizontal"/> 

<TextView 
    android:id="@+id/tvListDuration" 
    android:text="0:00" 
    android:layout_weight="0" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:padding="5dp" 
    android:layout_alignParentRight="true" /> 

<TextView 
    android:id="@+id/tvFilePath" 
    android:text="FilePath will be here" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_weight="1" 
    android:layout_below="@id/tvFileName" 
    android:layout_toRightOf="@id/ivListAlbumArt" 
    android:padding="5dp"/> 

</RelativeLayout> 

UPD : 당신은 어디 ivListAlbumArt를 초기화하지 않은

11-14 07:08:31.742 5943-5943/ru.app.a_book W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x4159aba8) 
11-14 07:08:31.742 5943-5943/ru.app.a_book E/AndroidRuntime﹕ FATAL EXCEPTION: main 
Process: ru.app.a_book, PID: 5943 
java.lang.NullPointerException 
     at ru.app.a_book.TabLibrary$2.onItemClick(TabLibrary.java:182) // code: ivListAlbumArt.setImageBitmap(bitmap); 
     at android.widget.AdapterView.performItemClick(AdapterView.java:299) 
     at android.widget.AbsListView.performItemClick(AbsListView.java:1113) 
     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2911) 
     at android.widget.AbsListView$3.run(AbsListView.java:3645) 
     at android.os.Handler.handleCallback(Handler.java:733) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5001) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
     at dalvik.system.NativeStart.main(Native Method) 

Answer 1

로그 캣 출력, 당신은 널 포인터 예외

초기화를 받고 그 이유는 ivListAlbumArt in setOnItemClickListener :

lvLibList.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     public void onItemClick(AdapterView<?> parent, View view, 
           int position, long id) { 
      ivListAlbumArt = (ImageView) view.findViewById(R.id.ivListAlbumArt); 
     } 
});