Question

我有一个产品目录CustomGrid。 Grid的数据存储在本地。 Text来自本地JSON文件，图像也存储在res下。

在显示GridView时，300项未正确排列。它们在20个条目后重复，当我向上和向下滚动时它们会混淆。

我调试了数据数组，但它们看起来很好。我现在每个项目也有相同的图像路径。因此每个Gridview项都具有相同的图像。但那就是GridView没有不同的行为。

我在其他Gridview上没有问题，项目少得多。我读到了延迟加载，但我没有下载图像文件

为什么Grid表现得像这样？这一次是否过载？我怎么解决这个问题？

编辑：

CustomGrid：

public class CustomGrid extends BaseAdapter{
private Context mContext;
private final String[] gridItemText;
private final int[] imageID;

public CustomGrid(Context c, String[] gridItemText, int[] imageID){
    mContext = c;
    this.gridItemText = gridItemText;
    this.imageID = imageID;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return gridItemText.length;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View grid;
    LayoutInflater inflater = (LayoutInflater) mContext
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null) {

        //grid = new View(mContext);
        grid = inflater.inflate(R.layout.grid_single_main, null);
        TextView textView = (TextView) grid.findViewById(R.id.grid_single_text);
        ImageView imageView = (ImageView)grid.findViewById(R.id.grid_single_image);
        textView.setText(gridItemText[position]);
        imageView.setImageResource(imageID[position]);
    } else {
        grid = (View) convertView;
    }

    return grid;
}

}

的活动：

CustomGrid adapter = new CustomGrid(ProductCatalogActivity.this, menuData, imagePath);
    gridView1=(GridView)findViewById(R.id.grid_Main);
    gridView1.setAdapter(adapter);
    gridView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
            //ToDo
    }
});

Answer 1

尝试使用此代替您的Viewholder机制

   TextView textView;
    ImageView imageView;

    if (convertView == null) {

        //grid = new View(mContext);
        convertView = inflater.inflate(R.layout.grid_single_main, null);
        textView = (TextView) convertView.findViewById(R.id.grid_single_text);
        imageView = (ImageView) convertView.findViewById(R.id.grid_single_image);
        convertView.setTag(new ViewHolder(textView, imageView));
    } else {

        ViewHolder viewHolder = (ViewHolder) convertView.getTag();
        textView = viewHolder.textView;
        imageView = viewHolder.imageView;

    }

    textView.setText(gridItemText[position]);
    imageView.setImageResource(imageID[position]);
return convertView;

也使用此视图

 private static class ViewHolder {

        public final TextView textView;
        public final ImageView imageView;

        public ViewHolder(TextView textView, ImageView imageView) {
            this.textView = textView;
            this.imageView = imageView;
        }
    }

Android - Gridview表现得很疯狂

1 个答案: