0

我在那里有 ListView 的自定义适配器，我有下载位图的线程。它工作不好，因为当位图加载时它没有显示在列表视图中，如果我想看到它，我必须滚动列表。

所以问题是如何强制重新生成视图。在这种认识中，有很多困难。这有可能改变吗？

有我的代码：

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.IOException;
import java.net.URL;
import java.util.List;

public class Adapter extends ArrayAdapter<Place> {
    private Activity mActivity;
    private List<Place> mList;


    public Adapter(Activity context, List<Place> objects) {
        super(context, R.layout.row, objects);
        mActivity = context;
        mList = objects;
    }

    static class ViewHolder {
        private TextView mTextViewName;
        private TextView mTextViewAddress;
        private TextView mTextViewWeb;
        private ImageView mImageButtonPhoto;
    }
    ViewHolder viewHolder;
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater inflator = mActivity.getLayoutInflater();
            convertView = inflator.inflate(R.layout.row, null);
            viewHolder = new ViewHolder();
            viewHolder.mTextViewName = (TextView) convertView.findViewById(R.id.textView1);
            viewHolder.mTextViewAddress = (TextView) convertView.findViewById(R.id.textView2);
            viewHolder.mTextViewWeb = (TextView) convertView.findViewById(R.id.textView3);
            viewHolder.mImageButtonPhoto = (ImageView) convertView.findViewById(R.id.imageButton1);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.mTextViewName.setText(mList.get(position).getName());
        viewHolder.mTextViewAddress.setText(mList.get(position).getAddress());
        viewHolder.mTextViewWeb.setText(mList.get(position).getUrl().toString());
        viewHolder.mTextViewWeb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(Intent.ACTION_VIEW);
                i.setData(Uri.parse(mList.get(position).getUrl().toString()));
                mActivity.startActivity(i);
            }
        });
        URL url = mList.get(position).getPhoto_url();
        final URL finalUrl = url;
        new Thread(new Runnable() {
            public void run() {
                final Bitmap b;
                try {
                    b = BitmapFactory.decodeStream(finalUrl.openConnection().getInputStream());
                    viewHolder.mImageButtonPhoto.post(new Runnable() {
                        public void run() {
                            viewHolder.mImageButtonPhoto.setImageBitmap(b);
                        }
                    });
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
        return convertView;
    }

}
4

1 回答 1

2

给适配器提供数据后，您是否尝试过调用notifyDataSetChanged()适配器？

它将调用invalidate()每个项目的View，这会使它们重绘。

编辑：没关系，您需要使用该add(item)方法。

当您准备好更新数据时，请执行一个for循环：

for (int i = 0; i < mList.getCount(); i++) {
    adapter.add(mList.getItem(i));
}
于 2012-07-26T20:33:45.137 回答