在Android中,要實現(xiàn)一個ItemList的適配器,你需要創(chuàng)建一個自定義的適配器類,該類繼承自BaseAdapter或者ArrayAdapter。以下是一個簡單的示例,展示了如何實現(xiàn)一個自定義的適配器:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="8dp">
<ImageView
android:id="@+id/image"
android:layout_width="48dp"
android:layout_height="48dp"
android:src="@drawable/ic_launcher_background" />
<TextView
android:id="@+id/text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="8dp"
android:text="Item Text"
android:textSize="16sp" />
</LinearLayout>
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
public class MyListAdapter extends BaseAdapter {
private List<Item> itemList;
private LayoutInflater inflater;
public MyListAdapter(Context context, List<Item> itemList) {
this.itemList = itemList;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return itemList.size();
}
@Override
public Object getItem(int position) {
return itemList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item, parent, false);
viewHolder = new ViewHolder();
viewHolder.image = convertView.findViewById(R.id.image);
viewHolder.text = convertView.findViewById(R.id.text);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
Item item = itemList.get(position);
viewHolder.image.setImageResource(item.getImageResource());
viewHolder.text.setText(item.getText());
return convertView;
}
static class ViewHolder {
ImageView image;
TextView text;
}
}
ListView listView = findViewById(R.id.list_view);
List<Item> itemList = new ArrayList<>();
// 添加數(shù)據(jù)到itemList
MyListAdapter adapter = new MyListAdapter(this, itemList);
listView.setAdapter(adapter);
這樣,你就成功地實現(xiàn)了一個自定義的ItemList適配器。根據(jù)你的需求,你可以修改list_item.xml布局文件和MyListAdapter類,以便更好地展示你的數(shù)據(jù)。