我的应用程序使用ListView
(自定义适配器)来显示所有图像,我把checkbox(CB)
标记为我选择的图像。
选择3张图像后,必须禁用所有CB以避免添加更多图像。请帮助我,我现在已经做了5天,仍然没有代码工作。
这是我的代码:
MainActivity:实现OnCheckedChangedListener
@Override
public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
if (isChecked){
checkbox = (CheckBox) arg0.getTag(R.id.check);
checkbox.setEnabled(false);
}
}
MyAdapter:扩展ArrayAdapter(模型)
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
LayoutInflater inflator = context.getLayoutInflater();
convertView = inflator.inflate(R.layout.row, null);
viewHolder = new ViewHolder();
viewHolder.text = (TextView) convertView.findViewById(R.id.label);
viewHolder.text2 = (TextView) convertView.findViewById(R.id.label2);
viewHolder.img = (ImageView)convertView.findViewById(R.id.img);
viewHolder.checkbox = (CheckBox) convertView.findViewById(R.id.check);
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag.
list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
counter++;
Log.d("mer", counter + " counter");
}
});
convertView.setTag(viewHolder);
convertView.setTag(R.id.label, viewHolder.text);
convertView.setTag(R.id.label2, viewHolder.text2);
convertView.setTag(R.id.img, viewHolder.img);
convertView.setTag(R.id.check, viewHolder.checkbox);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.checkbox.setTag(position); // This line is important.
viewHolder.text.setText(list.get(position).getName());
viewHolder.text2.setText(list2.get(position).getName());
Bitmap bmImg = BitmapFactory.decodeFile(list2.get(position).getName());
Bitmap bmThumbnail = ThumbnailUtils.extractThumbnail(bmImg,75, 75);
viewHolder.img.setImageBitmap(bmImg);
viewHolder.checkbox.setChecked(list.get(position).isSelected());
return convertView;
}
提前致谢。
在你的array adapter
添加条件,检查列表大小,如下所示:
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(list.size() < 3)
{
int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag.
list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
counter++;
Log.d("mer", counter + " counter");
}
else
{
buttonView.setChecked(false);
}
}
});