Question

我有一个listView，它当前显示图像的名称以及旁边图像的拇指。我突出显示所选的textBox green onClick，但在滚动列表时，其他项目也会突出显示。

ADAPTER：

public class CustomListAdapter extends BaseAdapter {
   private ArrayList<String> data;
   private Boolean[] isSelected;
   private Activity activity;
   private static LayoutInflater inflater=null;
   public ImageLoader imageLoader;
   View vi;

public CustomListAdapter(Activity a, ArrayList<String> c){
    activity = a;
    data = c;       
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    imageLoader=new ImageLoader(activity.getApplicationContext());
    isSelected = new Boolean[data.size()];
    System.out.println("data size :  " + data.size());
    for(int i =0; i < isSelected.length; i++)isSelected[i] = false;
}
public int getCount(){
    return data.size();
}
public Object getItem(int position){
    return data.get(position);  
}

public long getItemId(int position){        
    return position;
}
public View getView(int position, View convertView, ViewGroup parent){
    vi=convertView;
    if(convertView == null) // if it's not recycled, initialize some attributes
        vi = inflater.inflate(R.layout.each, null);

        TextView text=(TextView)vi.findViewById(R.id.text);
        ImageView image=(ImageView)vi.findViewById(R.id.image);

        /////////////////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! HERE
        if(isSelected[position])text.setBackgroundColor(Color.GREEN);

        text.setText("image: "+ data.get(position).substring(data.get(position).lastIndexOf("/")+1, data.get(position).indexOf(".jpg")));
        imageLoader.DisplayImage(data.get(position), image);

        return vi;
    }
public void setMy_ItemSelected(int position, Boolean tf){/////each convertview resets this value?
    System.out.println("selected position size of array: " + Integer.toString(isSelected.length));
    System.out.println("selected position: " + position);

    if(tf){ isSelected[position] = true;}
    notifyDataSetChanged();
    System.out.println("selected position true/false: " + isSelected);
}

}

点击听众：

    private class dataExport implements AdapterView.OnItemClickListener {
    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

        adapter.setMy_ItemSelected(position, true);

        /*FileDialog popWindow = new FileDialog();              //USB pop window for folder selection
        popWindow.open_PathSelector(MainActivity.this);
        */
    }
}

Answer 1

您需要两种项目视图类型：一种用于所选项目，另一种用于所有未选择项目。适配器将自动处理仅将正确类型传递到getView方法。

目前，您的适配器只知道一种类型的视图，因此它只会将其可用的任何回收视图传递到您的getView方法中 - 其中一些可能仍然具有绿色突出显示。

您需要在适配器中实施getItemViewType和getViewTypeCount，它才能正常运行。

修改

我现在很无聊，所以这里应该是这样的：D

protected static final int TYPE_NORMAL = 0;
protected static final int TYPE_SELECTED = 1;
public int getItemViewType(int position) {
    return isSelected[position] ? TYPE_SELECTED : TYPE_NORMAL;
}

public int getViewTypeCount() {
    return 2;
}

无法从转换视图中获取父级位置

1 个答案:

修改