在listview填加文字图片功能

Question

因为我做一个类围脖的系统,想在listview做图片和文字,但有些只有图片或只有文字,应该怎么做? private ArrayList<String> commentNickname = null;
private ArrayList<String> sightComment = null;
private ArrayList<Bitmap> commentImage = null;ArrayList<HashMap<String, Object>> commentList = new ArrayList<HashMap<String, Object>>();
        HashMap<String, Object> map= null;
        while(i<commentCount){
         map= new HashMap<String, Object>();
         map.put("picture", commentImage.get(i));
         map.put("commentnickname",commentNickname.get(i));
         map.put("sightComment", sightComment.get(i));
         commentList.add(map);
         i++;
        }
        SightAdapter listAdapter = new SightAdapter(this, commentList, R.layout.sightcommentlistview,  
         new String[] { "commentnickname", "sightComment","picture"}, 
         new int[] { R.id.LVuserNameCO,R.id.LVsightComment,R.id.LVimageView});
        setListAdapter(listAdapter);几个arraylist都是从别地传过来的,里面可能有空,我需要一一对应,就是空的话就不显示,应该怎么办,不然会报错?

Answer 1

http://blog.csdn.net/redoffice/article/details/6666185好好研究去吧。。

Answer 2

 SightAdapter listAdapter = new SightAdapter(this, commentList, R.layout.sightcommentlistview,  
                new String[] { "commentnickname", "sightComment","picture"},                 new int[] { R.id.LVuserNameCO,R.id.LVsightComment,R.id.LVimageView});
红线处，会取到map中相应的值么？看看吧

Answer 3

commentnickname肯定有值,我就是想做可以判断sightComment 和picture里面可能有值,可能没值的情况,有值就显示，没值就不显示，我在这两个阿arraylist都可能存了null来占位，这样做对吗？

Answer 4

这是我找别人的adapter,package mars.Client;
 
import java.util.List;
import java.util.Map;
 
import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Checkable;
import android.widget.ImageView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
 
public class myAdapter extends SimpleAdapter {
 
private int[] mTo;
    private String[] mFrom;
    private ViewBinder mViewBinder;
 
    private List<? extends Map<String, ?>> mData;
 
    private int mResource;
    private int mDropDownResource;
    private LayoutInflater mInflater;
 
public myAdapter(Context context,
List<? extends Map<String, ?>> data, int resource, String[] from,
int[] to) {
super(context, data, resource, from, to);
mData = data;
        mResource = mDropDownResource = resource;
        mFrom = from;
        mTo = to;
        
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
 
 
 /**
     * @see android.widget.Adapter#getView(int, View, ViewGroup)
     */
    public View getView(int position, View convertView, ViewGroup parent) {
        return createViewFromResource(position, convertView, parent, mResource);
    }
 
    private View createViewFromResource(int position, View convertView,
            ViewGroup parent, int resource) {
        View v;
        if (convertView == null) {
            v = mInflater.inflate(resource, parent, false);
            
            final int[] to = mTo;
            final int count = to.length;
            final View[] holder = new View[count];
 
            for (int i = 0; i < count; i++) {
            
             holder[i] = v.findViewById(to[i]);            }
            
            v.setTag(holder);
//            v.setTag(null);
           
        } else {
            v = convertView;
        }
 
        bindView(position, v);
 
        return v;
    }
 
    private void bindView(int position, View view) {
        final Map dataSet = mData.get(position);
        if (dataSet == null) {
            return;
        }
 
        final ViewBinder binder = mViewBinder;
        final View[] holder = (View[]) view.getTag();
        final String[] from = mFrom;
        final int[] to = mTo;
        final int count = to.length;
       View convertView = mInflater.inflate(R.layout.sightcommentlistview, null);        for (int i = 0; i < count; i++) {
            final View v = holder[i];
            if (v != null) {
                final Object data = dataSet.get(from[i]);
//                if(data i)
                String text = data == null ? "" : data.toString();
                if (text == null) {
                    text = "";
                }                boolean bound = false;
                if (binder != null) {
                    bound = binder.setViewValue(v, data, text);
                }
 
                if (!bound) {
                    if (v instanceof Checkable) {
                        if (data instanceof Boolean) {
                            ((Checkable) v).setChecked((Boolean) data);
                        } else {
                            throw new IllegalStateException(v.getClass().getName() +
                                    " should be bound to a Boolean, not a " + data.getClass());
                        }
                    } else if (v instanceof TextView) {
                        setViewText((TextView) v, text);
                    } else if (v instanceof ImageView) {
 
                        if (data instanceof Integer) {
                            setViewImage((ImageView) v, (Integer) data);                            
                        } else if(data instanceof Bitmap) {
                     if(data==null){
                      System.out.println("nopicture2");
                     }
                            setViewImage((ImageView) v, (Bitmap)data);
                        
                        
                        }
                    } else {
                        throw new IllegalStateException(v.getClass().getName() + " is not a " +
                                " view that can be bounds by this SimpleAdapter");
                    }
                }
            }
        }
    }
 
    public void setViewImage(ImageView v, int value) {
        v.setImageResource(value);
    }
 
 
    public void setViewImage(ImageView v, Bitmap bm) {
     ((ImageView) v).setImageBitmap(bm);
    }
 
};能够实现显示图片和文字,但有空的地方,比如第3行有文字,但是没有图片,我在arratlist图片里面存了空的bitmap,然后用这个方法的话会在没图片的地方加上上一张图片,我不希望这样,能改成有不显示imageview吗?