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CheckBox gets unchecked on scroll in a custom listview

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野趣味
野趣味 2020-11-29 12:13

I know that this question has been asked over and over again but still I\'ve not been a able to find a suggestion that really helps me. The checkbox is unchecked whenever th

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  • 时光说笑
    时光说笑 (楼主)
    2020-11-29 12:45

    getView() is called whenever a previously invisible list item needs to be drawn. Since you recreate itemChecked[] each time this method is called you will have the new checkbox unchecked and a different Array for each resulting View. (final in Java does not make that field unique like in C) Simplest way to solve that is to make itemChecked a classmember and set / restore checkbox state based on that one.

    public class MyListAdapter extends ArrayAdapter {
    private final boolean[] mCheckedState;
    private final Context mContext;

    public MyListAdapter(Context context, int resource, int textViewResourceId, List objects) {
        super(context, resource, textViewResourceId, objects);
        mCheckedState = new boolean[objects.size()];
        mContext = context;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // simplified to just a Checkbox
        // ViewHolder and OnCheckedChangeListener stuff left out 
        CheckBox result = (CheckBox)convertView;
        if (result == null) {
            result = new CheckBox(mContext);
        }
        result.setChecked(mCheckedState[position]);
        return result;
    }
}

    
    
             
    
                                                        
    
            
            
    
              
                
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