AndroidAnnotations @EBean類實例化問題

Question

我正在實現我自己的適配器類，它使用AA擴展BaseAdapter，但我需要構造函數中的多個參數才能正確實例化它。我想知道是否有辦法做到這一點？

@EBean 
public class MomentViewAdapter extends BaseAdapter { 
    protected LayoutInflater mInflater; 
    protected Context mContext; 
    protected List<FavoriteInfo> mDatas; 
    protected int mItemLayoutId; 

    public MomentViewAdapter(Context context) { 
     this.mContext = context; 
//  this.mInflater = LayoutInflater.from(mContext); 
//  this.mDatas = mDatas; 
//  this.mItemLayoutId = itemLayoutId; 
    } 

    public void setUp(List<FavoriteInfo> mDatas, int itemLayoutId) { 
     this.mInflater = LayoutInflater.from(mContext); 
     this.mDatas = mDatas; 
     this.mItemLayoutId = itemLayoutId; 
    } 


    @Override 
    public int getCount() 
    { 
     return mDatas.size(); 
    } 

    @Override 
    public FavoriteInfo getItem(int position) 
    { 
     return mDatas.get(position); 
    } 

    @Override 
    public long getItemId(int position) 
    { 
     return position; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 

     if(convertView == null) { 
      convertView = LayoutInflater.from(mContext).inflate(mItemLayoutId, parent, false); 
     } 
     ImageView img = (ImageView) convertView.findViewById(R.id.detail_moment_camera_picture); 
     if (mDatas.get(position).isVideoFavorite()) { 
      Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(mDatas.get(position).getVideoURL(), MediaStore.Video.Thumbnails.MINI_KIND); 
      img.setImageBitmap(bitmap); 
     } else { 
      getBitmapFromURL(mDatas.get(position).getImageURL(), img); 
      // img.setImageBitmap(getBitmapFromURL(mDatas.get(position).getImageURL())); 
     } 
     img.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(mContext, GeneratedClassUtils.get(MomentDetailActivity.class)); 
       Bundle mBundle = new Bundle(); 
       mBundle.putSerializable(FavoriteInfo.KEY, mDatas.get(position)); 
       mBundle.putBoolean(CollectionInfo.KEY_WATCH_FLAG, false); 
       intent.putExtras(mBundle); 
       mContext.startActivity(intent); 
      } 
     }); 

     return convertView; 

    } 

    @Background 
    protected void getBitmapFromURL(String src, ImageView img) { 
     try { 
      URL url = new URL(src); 
      HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
      connection.setDoInput(true); 
      connection.connect(); 
      InputStream input = connection.getInputStream(); 
      updateImageView(BitmapFactory.decodeStream(input), img); 
      return; 
     } catch (IOException e) { 
      System.out.println("************** network exception: download image failed"); 
      return; 
     } 
    } 

    @UiThread 
    protected void updateImageView(Bitmap bitmap, ImageView img) { 
     img.setImageBitmap(bitmap); 
     return; 
    } 

} 

當前我正在使用setUp方法來啓動其他參數。但它似乎有問題。我用它在我的活動是這樣的：

@EActivity 
public class DeviceDetailActivity extends BaseActivity { 
    @Bean 
    MomentViewAdapter mGridViewAdapter; 

    /* some other code like @ViewById */ 
    @Afterviews 
    public void afterViews(){ 
     init(); 
    } 
    void init(){ 
     afterInject(); 
    } 

    @AfterInject // injected beans are only available from here 
    public void afterInject() { 
     mGridViewAdapter.setUp(mMomentDatas, R.layout.device_detail_moment_listitem_simple); 
     mGridView.setAdapter(mGridViewAdapter); 
    } 

} 

當我跑了我的電話，我得到空指針異常：

unable to start activity ComponentInfo{com.bloomsky.bloomsky/com.bloomsky.android.activities.common.DeviceDetailActivity_}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.GridView.setAdapter(android.widget.ListAdapter)' on a null object reference 

它出現在安裝完成後（）方法得到，雖然叫，這對我來說真的很混亂。所以我想也許這個對象沒有正確實例化。

Answer 1

mGridView爲空，因爲在@AfterViews之前調用@AfterInject。您的視圖根本不受Android註釋限制。因此改用@AfterViews。