如何在GridView（Android）中动态替换ImageView？

所以我需要创建一个简单的棋盘游戏。它基于一个片段内的Gridview（10x10）。该活动还显示了带有控件的另一个片段（从左下方向右上方）。当我按下控件片段上的一个按钮时，我需要移动GridView中的图像。到目前为止，我设法填充GridView，但我无法弄清楚如何移动图像。如何在GridView（Android）中动态替换ImageView？

这是网格片段

 public class Grid extends Fragment{ 
     GridView gridView; 
     private View rootView; 
     public PhotoImageAdapter mAdapter; 
     Integer[] image = { 
       R.drawable.pucman, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
       R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, R.drawable.ground, 
     }; 


     @Override 


     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
           Bundle savedInstanceState) { 

      rootView = inflater.inflate(R.layout.fragment_grid, container, false); 
      gridView = rootView.findViewById(R.id.GridView); 
      gridView.setAdapter(new PhotoImageAdapter(this.getActivity(), image)); 
      return rootView; 


     } 


    public void goRight()// this function is called by the control fragment. 
    { 
    // here is my not so fructuous attempt to replace the image in the 
    //second cell with the image of my character 

    image[1]=R.drawable.pucman; 
    image[0]=R.drawable.ground; 

    }

这是我的适配器：

public class PhotoImageAdapter extends BaseAdapter { 
    private Context mContext; 
    public Integer[] mThumbIds; 



    public PhotoImageAdapter(Context c, Integer[] image) { 
     mContext = c; 
     mThumbIds = image; 


    } 

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

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

    public long getItemId(int position) { 
     return 0; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView imageView; 
     if (convertView == null) { // if it's not recycled, initialize some attributes 
      imageView = new ImageView(mContext); 
      imageView.setLayoutParams(new GridView.LayoutParams(80, 80)); 
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
      imageView.setPadding(8, 8, 8, 8); 
     } else { 
      imageView = (ImageView) convertView; 
     } 


     imageView.setImageResource(mThumbIds[position]); 
     return imageView; 
    } 

}

任何帮助将不胜感激！谢谢:)

来源

2017-10-29 Eric

你想制作益智游戏吗？ – 2017-10-29 04:41:28

不是，它更像是一个可以穿过它的角色的棋盘游戏。 – Eric

-1

我终于想通了！我只需要在调用goRight（）时替换片段并提交事务。希望它可以帮助某人。

来源

2017-10-30 00:54:11 Eric

我认为你必须更新每个移动适配器，请尝试更改图像阵列与更新的图像阵列后，加入这行：

gridView.setAdapter(new PhotoImageAdapter(this.getActivity(), image));

来源

2017-10-29 06:23:29 batsheva

嗨，你试过了吗？它有帮助吗？ – batsheva

是的，不幸的是，它给了我一个“java.lang.NullPointerException：试图调用虚拟方法'无效android.widget.GridView.setAdapter（android.widget.ListAdapter）'对空对象引用”。 – Eric

如果你仍然在同一个窗口中，你的网格视图如何为空？ meybe你必须声明它最后 – batsheva

如何在GridView（Android）中动态替换ImageView？

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