问题
I have a list view in which each data is fetched from List adapter. Each item in list view contains a text view and toggle button. But there occurs a problem when i scroll the list. the checked state of toggle buttons change i.e if i selected a toggle button at index 4, then after scrolling i find that any random button except fourth is selected.
回答1:
if u still doesn't get any solution pls try this getview method.. // switchState[] is a boolean array .
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = new ViewHolder();
// mSwitchButton = (ToggleButton) findViewById(R.id.switchButton);
if(convertView == null) {
convertView = mInflator.inflate(R.layout.settings_item_cell, parent, false);
holder.categoryName =
(TextView) convertView.findViewById(R.id.categoryType);
convertView.setTag(holder);
holder.switchButton = (ToggleButton) convertView.findViewById(R.id.switchButton);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.switchButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
int index = (Integer) v.getTag();
Log.v("tag of switch============",""+index);
if(((ToggleButton) v).isChecked()) {
switchState[index] = true;
((ToggleButton) v).setButtonDrawable(R.drawable.item_selected);
}
else {
((ToggleButton) v).setButtonDrawable(R.drawable.item_deselected);
switchState[index] =false;
}
isToggleButtonClicked = true;
}
});
if(switchState[position])
holder.switchButton.setButtonDrawable(R.drawable.item_selected);
else
holder.switchButton.setButtonDrawable(R.drawable.item_deselected);
holder.categoryName.setText(categories[position]);
holder.switchButton.setTag(new Integer(position));
return convertView;
}
回答2:
Since rows get recycled, you need to maintain your own state, saving and restoring your ToggleButton status as it is modified. Here is a sample project demonstrating using a RatingBar in rows; the same basic process should hold for a ToggleButton.
回答3:
I know this is a really old thread , but the answers I found to the question were not really great. It took me some time to get a workable solution from the two answers. I just wanted to share the working code, if any other noob is trying to figure out how persist the state of toggle button while scrolling.
private class MyListAdapter extends ArrayAdapter<Product> {
boolean [] switchState= new boolean[100] ;
public MyListAdapter() {
super(ProductSelectActivity.this, R.layout.item_view, myProducts);
}
public View getView( int position, View convertView, ViewGroup parent) {
// Make sure we have a view to work with (may have been given null)
ViewHolder holder;
View itemView = convertView;
if (itemView == null) {
itemView = getLayoutInflater().inflate(R.layout.item_view, parent, false);
View row= itemView;
holder= new ViewHolder(row);
itemView.setTag(holder);
holder.switchButton = (ToggleButton) itemView.findViewById(R.id.favorite_button);
}
else
{
holder = (ViewHolder) itemView.getTag();
}
holder.switchButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
int index = (Integer) v.getTag();
if(((ToggleButton) v).isChecked()) {
switchState[index] = true;
((ToggleButton) v).setBackgroundResource(android.R.drawable.btn_star_big_on);
}
else {
((ToggleButton) v).setBackgroundResource(android.R.drawable.btn_star_big_off);
switchState[index] =false;
}
}
});
if(switchState[position])
holder.switchButton.setBackgroundResource(android.R.drawable.btn_star_big_on);
else
holder.switchButton.setBackgroundResource(android.R.drawable.btn_star_big_off);
//holder.categoryName.setText(categories[position]);
holder.switchButton.setTag(Integer.valueOf(position));
ViewHolder.class
public class ViewHolder {
ToggleButton switchButton=null;
ViewHolder(View base) {
this.switchButton=(ToggleButton)base.findViewById(R.id.favorite_button);
}
}
This code compiles.
来源：https://stackoverflow.com/questions/4712441/toggle-button-in-a-list-view-loose-their-state-when-scrolled-of-screen-in-androi