android中用于多种listview布局行的通用适配器

Question

通过ID负载XML列的布局,获得控制(TextView的,ImageView的,等..),显示数据......是这样的:对于有差异的行布局模板每个列表视图,我必须创建的每个自定义适配器,它做同样的事情:

public class CommentAdapter extends BaseAdapter {

protected Activity activity;
protected static LayoutInflater layoutInflater = null;  
protected List<Comment> lst;    

public CommentAdapter(Activity activity,  List<Comment> lst){
    this.activity = activity;       
    this.lst = lst;
    layoutInflater = (LayoutInflater)this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

public int getCount() {     
    return lst.size();
}

public Object getItem(int position) {   
    return lst.get(position);
}

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

public static class ViewHolder{
    public TextView textName;
    public TextView textComment;
    public ImageView image;
}

public  View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    ViewHolder viewHolder;
    if (v == null) {
        v = layoutInflater.inflate(R.layout.listitem, null);
        viewHolder = new ViewHolder();
        viewHolder.textName = (TextView) v.findViewById(R.id.txtName);
        viewHolder.image = (ImageView) v.findViewById(R.id.icon);
        viewHolder.textComment = (TextView)v.findViewById(R.id.txtComment);
        v.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) v.getTag();
    }
    Static.overrideFonts(v);
    viewHolder.image.setBackgroundResource(lst.get(position).Icon);
    viewHolder.textName.setText(lst.get(position).Name);
    viewHolder.textComment.setText(lst.get(position).Comment);

    return v;
}
}

有了很多种列表视图(差异行布局模板),我必须创建许多适配器.
所以,问题是我想创建一个模板适配器,它可以是动态加载行xml,基于它的id的地图视图控件(也许使用反射).行xml布局,控件id,视图控件将在另一个地方定义.
有没有design pattern,example或者framework可以做到这一点？

Answer 1

像这样的东西似乎可行.我根本没有测试过这个,但理论上你可以通过这样的方式逃脱:

public interface Adaptable {
    //Interface that any object you make that should be put in a listview
    //should implement
    public View buildView(View v, LayoutInflater inflater);
    public int getLayoutId();
}

public class MyObject implements Adaptable
    //Just hardcode your layout for this type of object
    public int getLayoutId() {
        return R.layout.myLayout;
    }

    //getView() will pass the recycled view to this method
    //which will handle building the view per this object
    public View buildView(View v, LayoutInflater inflater) {
        if(v == null) {
            v = inflater.inflate(getLayoutId());
            //Other initialization
        } //other initialization

        return v;
    }
}

//Then make the generic adapter that handles anything that implements
//the Adaptable interface
public GenericAdapter implements ListAdapter {
    private LayoutInflater inflater;
    private List<Adaptable> items;
    public GenericAdapter(List<Adaptable> items, Context c) {
        this.items = items;
        inflater = LayoutInflater.from(c);
    }

    //Now, using polymorphism, it should return a correctly built
    //view for whatever object type you've passed in.
    @Override
    public View getView(int pos, View convertView, ViewGroup parent) {
        return items.get(pos).buildView(convertView, inflater);
    }
}

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    List<MyObject> objects = new ArrayList<MyObject>();
    //Fill your list however.

    //get your ListView, then...
    listView.setAdapter(new GenericAdapter(object, this));
}

我可能完全忽略了一些不起作用的原因 - 我在五分钟内输入了这个.从理论上讲,我认为它会起作用.