Android中实现异步加载图片的Demo

package cn.riddles.activity; import android.content.Context; import android.os.Environment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; /** * @author riddlezhang 歌曲条目适配器 */ public class SongListAdapter extends BaseAdapter { private static final String TAG = "SongListAdapter"; private Context mContext; private String[] strings = {"王力宏","吴尊","何润东","金城武","吴彦祖"}; private String[] paths = {"http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/wang_li_hong.jpg", "http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/wu_zun.jpg", "http://list.image.baidu.com/t/image_category/galleryimg/menstar/hk/he_run_dong.jpg", Environment.getExternalStorageDirectory() + "/MyDownloadFile/"+"jin_cheng_wu.jpg", Environment.getExternalStorageDirectory() + "/MyDownloadFile/"+"wu_yan_zu.jpg"}; public SongListAdapter(Context mContext) { this.mContext = mContext; } public void setmContext(Context mContext) { this.mContext = mContext; } public int getCount() { return paths.length; } public Object getItem(int position) { return null; } public long getItemId(int position) { return 0; } public View getView(int position, View convertView, ViewGroup parent) { convertView = LayoutInflater.from(mContext).inflate(R.layout.lv_adapter, null); ImageView image = (ImageView) convertView.findViewById(R.id.image); TextView songer = (TextView) convertView.findViewById(R.id.songer); image.setTag(paths[position]); songer.setText(strings[position]); new CanvasImageTask().execute(image); Log.i(TAG, "execute:"+strings[position]); return convertView; } }