如何禁用圖庫的項目？

Question

我有一個畫廊，我已經實現了擴展BaseAdapter的自定義適配器。對於某些項目，我希望它們被禁用，並且不可點擊。

重寫isEnabled（int）方法不起作用。我仍然可以點擊禁用的項目，然後，畫廊將其中心放置在該項目中。

任何想法？

Answer 1

這下面是畫廊插件

public boolean onSingleTapUp(MotionEvent e) { 

    if (mDownTouchPosition >= 0) { 

     // An item tap should make it selected, so scroll to this child. 
     scrollToChild(mDownTouchPosition - mFirstPosition); 

     // Also pass the click so the client knows, if it wants to. 
     if (mShouldCallbackOnUnselectedItemClick || mDownTouchPosition == mSelectedPosition) { 
      performItemClick(mDownTouchView, mDownTouchPosition, mAdapter 
        .getItemId(mDownTouchPosition)); 
     } 

     return true; 
    } 

    return false; 
} 

正如你所看到的相關源代碼，畫廊滾動輕敲的子項在其上進行點擊之前。 因此，真正禁用物品的唯一方法是將其延伸Gallery並覆蓋其中的onSingleTapUp(MotionEvent e)。

@Override 
public boolean onSingleTapUp(MotionEvent e) { 
    int itemPosition = pointToPosition((int) e.getX(), (int) e.getY()); 
    if (item at itemPosition is disabled) { 
     // Do nothing. 
     return true; 
    } 
    return super.onSingleTapUp(e); 
} 

試着讓我知道。

Answer 2

嘗試下面的代碼，您可以在其中處理特定位置的點擊事件。您也可以禁用特定項目。

public class SplashActivity extends Activity{ 
    private Activity _activity; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     Gallery g = new Gallery(this); 
       g.setAdapter(new ImageAdapter(this)); 
       setContentView(g); 
    } 

    public class ImageAdapter extends BaseAdapter { 
     int mGalleryItemBackground; 
     private Context mContext; 

     private Integer[] mImageIds = { 
       R.drawable.menu1, 
       R.drawable.menu2, 
       R.drawable.menu3, 
       R.drawable.menu4, 
       R.drawable.menu1, 
       R.drawable.menu2, 
       R.drawable.menu3, 
       R.drawable.menu4 
     }; 

     public ImageAdapter(Context c) { 
      mContext = c; 

     } 

     public int getCount() { 
      return mImageIds.length; 
     } 

     public Object getItem(int position) { 
      return position; 
     } 

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

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

      ImageView i = new ImageView(mContext); 

      i.setImageResource(mImageIds[position]); 
      i.setLayoutParams(new Gallery.LayoutParams(150, 100)); 
      i.setScaleType(ImageView.ScaleType.FIT_XY); 
      i.setBackgroundResource(mGalleryItemBackground); 
      if(position!=0){ 
      i.setEnabled(false); 
      i.setOnClickListener(new OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 
        Toast.makeText(SplashActivity.this, "" + position, Toast.LENGTH_SHORT).show(); 
       } 
      }); 
      } 
      return i; 
     } 
    } 
}