Android

Question

我有一个 CustomGrid 产品目录。网格的数据存储在本地。文本来自本地 JSON 文件，图像也存储在 res 下。

在显示 GridView 时，300 个项目没有正确排列。他们在 20 个条目后重复，当我上下滚动时他们混淆了。

我调试了数据数组，但它们看起来不错。我现在对每个项目也有相同的图像路径。所以每个 Gridview 项目都有相同的图像。但这与 GridView 的行为没有什么不同。

我在其他项目少得多的 Gridviews 上没有问题。我阅读了延迟加载，但我没有下载图像文件

为什么 Grid 会这样？这是不是一次过载太多了？我怎么解决这个问题？

编辑：

自定义网格：

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;
}

}

Activity:

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

试试这个代替你的 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;

也使用这个viewholder

 private static class ViewHolder {

        public final TextView textView;
        public final ImageView imageView;

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

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