android开发中会经常用来自定义的Adapter,如下就是一个简单的自定义Adapter实例。
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
/**
* 自定义适配器通过ListView显示内容,这个比较重要需要掌握
* @author Dylan
*/
public class CustomAdapterActivity extends Activity {
private ListView mListView;
private CustomAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mListView = (ListView) findViewById(R.id.listview);
mAdapter = new CustomAdapter();
mListView.setAdapter(mAdapter);
mListView.setOnItemClickListener(new ItemClickListener());
}
private final class ItemClickListener implements OnItemClickListener {
// AdapterView parent, --> ListView View view, ---> item int
// position,--> item的数据在Adapter中位置 long id---> item在listView中得位置
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
String name = (String) mAdapter.getItem(position);
Toast.makeText(getApplicationContext(), "name =" + name + ",position " + position, Toast.LENGTH_SHORT)
.show();
}
}
private final class CustomAdapter extends BaseAdapter {
private String[] names = new String[] { "无线和网络", "通话设置", "声音", "显示", "位置和安全", "应用程序", "账户与同步", "隐私权",
"SD卡和手机内存", "语言和键盘", "辅助功能", "日期和时间", "关于手机" };
private int[] images = new int[] { R.drawable.image01, R.drawable.image02, R.drawable.image03,
R.drawable.image04, R.drawable.image05, R.drawable.image06, R.drawable.image07, R.drawable.image08,
R.drawable.image09, R.drawable.image10, R.drawable.image11, R.drawable.image12, R.drawable.image13 };
private LayoutInflater mInflater;
public CustomAdapter() {
mInflater = getLayoutInflater();
}
// 描述adpter的大小(确定了listView的条目)
@Override
public int getCount() {
return names.length;
}
// Adapter对于的position的数据
@Override
public Object getItem(int position) {
return names[position];
}
// 得到item 在adapter所对应的位置
@Override
public long getItemId(int position) {
return position;
}
// 创建listview的item条目,把数据绑定给item int position, Adapter的下标 View
// convertView, 缓存的第一屏item的布局文件 ViewGroup parent ListView
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView != null) {
view = convertView;
} else {
view = mInflater.inflate(R.layout.item, parent, false);
}
ImageView iv_header = (ImageView) view.findViewById(R.id.iv_header);
TextView tv_name = (TextView) view.findViewById(R.id.tv_name);
iv_header.setImageResource(images[position]);
tv_name.setText(names[position]);
return view;
}
/*
* @Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewCache viewCache = null;
if (convertView == null) {
viewCache = new ViewCache();
convertView = inflater.inflate(R.layout.folder_list_item, null);
viewCache.tvName = (TextView) convertView.findViewById(R.id.tv_folder_name);
viewCache.ivPreview = (ImageView) convertView.findViewById(R.id.iv_folder_preview);
convertView.setTag(viewCache);
} else {
viewCache = (ViewCache) convertView.getTag();
}
FileInfo fileInfo = arrayList.get(position);
viewCache.tvName.setText(new File(fileInfo.filePath).getName());
return convertView;
}
public static class ViewCache {
public ImageView ivPreview;
public TextView tvName;
}
*/
}
}