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我正在尝试使用 gridView 创建一个 android 应用程序。在此应用程序中，我尝试将图像随机添加到 GridView 中。我有 5 张图像，这些图像添加到了可绘制对象中，例如 R.drawable.c0、R.drawable.c1、R.drawable.c2、R.drawable.c3、R.drawable.c4。

当我们单击每个网格时，每个网格中的图像会随机更改。我的编码工作正常，可以在每个网格单击中随机更改图像。但是我需要帮助来获取图像名称。

    public class MainActivity extends Activity {
 GridView gridview;
 ImageView imageView ;

 public static Integer[] mThumbIds = {
    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,


    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,

    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,

    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,

    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,


    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,

    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,

    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,


    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
    R.drawable.c4,


    R.drawable.c0, R.drawable.c1,
    R.drawable.c2, R.drawable.c3,
   };
   @Override
   public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
    gridview = (GridView) findViewById(R.id.gridview);
   gridview.setAdapter(new ImageAdapter(this));
   gridview.setOnItemClickListener(new OnItemClickListener() {
       public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
        //gridview.getId();
         imageView = (ImageView) v;
         Random r=new Random();
            int i=r.nextInt(16);
            Log.e("i",""+i);
          imageView.setImageResource(mThumbIds[i]);

          ImageAdapter im = (ImageAdapter)parent.getAdapter();


       }

      @Override
     public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.activity_main, menu);
      return true;
     }



    public class ImageAdapter extends BaseAdapter {
      private Context mContext;

  // private GridItem[] items;


   public ImageAdapter(Context c) {
       mContext = c;
   }

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

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

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

   // create a new ImageView for each item referenced by the Adapter
   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(40,40 ));
           imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
           imageView.setPadding(3, 3, 3, 3);
       } else {
           imageView = (ImageView) convertView;
       }

       Random r=new Random();
       int i=r.nextInt(5);

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


   }
    }
4

2 回答 2

1

使用 View 类的 set/getTag 方法。您可以将任何对象附加到视图并稍后检索它。

imageView.setImageResource(mThumbIds[i]);
imageView.setTag(mThumbIds[i]);

之后

Integer thumbId = (Integer)imageView.getTag();
于 2013-01-15T06:22:31.327 回答
0

使用底座适配器内的支架并更改您的getview()并为您的单元格使用 xml

 public  class ViewHolder {
        ImageView img;
        }

 public View getView(int position, View convertView, ViewGroup parent) {
               ViewHolder holder;
               if(convertView==null){
                    holder=new ViewHolder();
                    LayoutInflater li = getLayoutInflater();
                    convertView = li.inflate(R.layout.list_item, null);
                    holder.img = (ImageView)convertView.findViewById(R.id.imgView);
                    convertView.setTag(holder); 
                  }
                else
                {
                    holder = (ViewHolder)convertView.getTag();
                }

   Random r=new Random();
   int i=r.nextInt(5);

   holder.img.setImageResource(mThumbIds[i]);//edited
   return convertView;
}

ViewHolder允许您处理回收。并且XML为您的单元格将在运行时为您提供更大的灵活性和更少的复杂性和计算。

于 2013-01-15T08:03:11.887 回答