这是我第一次开发 Android 应用程序,所以这个问题可能是显而易见的。我想限制所选复选框的数量(即,用户应该只能选择最多 2 个复选框)。如何在 onCheckedChanged() 中执行此操作?
package com.mainak.walkbuddy;
import java.util.List;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
public class InteractiveArrayAdapter extends ArrayAdapter<Model>
{
private final List<Model> list;
private final Activity context;
public InteractiveArrayAdapter(Activity context, List<Model> list)
{
super(context, R.layout.activity_show_content, list);
this.context = context;
this.list = list;
}
static class ViewHolder
{
protected TextView text;
protected CheckBox checkbox;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View view = null;
int checkBoxCounter = 0;
int checkBoxInitialized = 0;
if (convertView == null)
{
LayoutInflater inflator = context.getLayoutInflater();
view = inflator.inflate(R.layout.activity_show_content, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.text = (TextView) view.findViewById(R.id.label);
viewHolder.checkbox = (CheckBox) view.findViewById(R.id.check);
viewHolder.checkbox.setOnCheckedChangeListener(
new CompoundButton.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
Model element = (Model) viewHolder.checkbox.getTag();
element.setSelected(buttonView.isChecked());
}
}
);
view.setTag(viewHolder);
viewHolder.checkbox.setTag(list.get(position));
}
else
{
view = convertView;
((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.text.setText(list.get(position).getName());
holder.checkbox.setChecked(list.get(position).isSelected());
return view;
}
}