在ListView中按比例拉伸列及其标题,可以通过自定义ListView的适配器来实现。以下是一个实现的步骤:
以下是一个示例代码:
public class CustomAdapter extends BaseAdapter {
private List<List<String>> data;
public CustomAdapter(List<List<String>> data) {
this.data = data;
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
holder = new ViewHolder();
holder.column1 = convertView.findViewById(R.id.column1);
holder.column2 = convertView.findViewById(R.id.column2);
holder.column3 = convertView.findViewById(R.id.column3);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
List<String> rowData = data.get(position);
holder.column1.setText(rowData.get(0));
holder.column2.setText(rowData.get(1));
holder.column3.setText(rowData.get(2));
return convertView;
}
private static class ViewHolder {
TextView column1;
TextView column2;
TextView column3;
}
}
在布局文件list_item.xml中,可以按照需要添加列的数量,并设置相应的权重属性。例如:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/column1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Column 1" />
<TextView
android:id="@+id/column2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:text="Column 2" />
<TextView
android:id="@+id/column3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:text="Column 3" />
</LinearLayout>
在使用ListView时,可以将自定义的适配器设置给ListView:
ListView listView = findViewById(R.id.listView);
CustomAdapter adapter = new CustomAdapter(data);
listView.setAdapter(adapter);
这样,ListView中的列和标题就会按照设置的权重比例进行拉伸,并显示相应的内容。
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