Question

CheckBox默认值无效。我已经通过CheckBox给出了setcheck(true)值，并且在布局中给出了，我需要将选中的值传递给arraylist。

如何使用arraylist在两个类之间发送值如何在android中的资产db中保存数据。

  public class CustomListAdapter extends ArrayAdapter<String> 
  {

   RetrieveFromDB sqlConn;
    private final Context context;
    private ArrayList<String> resArray;
    public static ArrayList<String> selitemsList=new ArrayList<String>();

    public CustomListAdapter(Context context, ArrayList<String> resArray)
    {
    super(context, R.layout.categorylist, resArray);
    // TODO Auto-generated constructor stub
    this.context = context;
    this.resArray = resArray;
     }
     public View getView(final int position, View convertView, ViewGroup       parent) {

    try{
            LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.list_item_2, parent, false);
        CheckBox chk=(CheckBox)rowView.findViewById(R.id.checkBox1);
        TextView  list= (TextView) rowView.findViewById(R.id.text2);
        list.setText(resArray.get(position).toString());
        sqlConn=new RetrieveFromDB(context);
          selitemsList=sqlConn.displaySelectedItems(EditSelectedItems.sel_category);
        sqlConn.close();

        if(selitemsList.contains(list.getText().toString()))
            chk.setChecked(true);
        else
            chk.setChecked(false);
        chk.setOnCheckedChangeListener(new OnCheckedChangeListener() 
        {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
            {
                // TODO Auto-generated method stub
                if(isChecked)
                {
                             CategoryListView.st.add(resArray.get(position).toString());
                    selitemsList.add(resArray.get(position).toString());

                };

Answer 1

关于.setChecked的代码是对的。尝试记录有关selitemsList内容的内容，您可以检查logcat。例如

Log.d("my debug", "selitemsList content:");
for (String s: selitemsList){
    Log.d("my debug", "\t- " + s);
}
if(selitemsList.contains(list.getText().toString())){
    Log.d("my debug", "selitemsList contains " + list.getText().toString());
    chk.setChecked(true);
}else{
    Log.d("my debug", "selitemsList doesn't contain " + list.getText().toString());
    chk.setChecked(false);
}

在这种模式下，您应该能够在logcat中看到问题所在。也许selitemsList没有正确填充。

Answer 2

使用SparseBooleanArray获取所选项目的列表。

int len = listView.getCount();
ArrayList<String> selectedItems = new ArrayList<String>();
SparseBooleanArray checked = listView.getCheckedItemPositions();
for (int i = 0; i < len; i++) {
    if (checked.get(i)) {
    String item = cont_list.get(i);
    selectedItems.add(item);
}

选中的默认复选框不起作用

2 个答案: