How to save boolean states from an array of checkboxes and load their states when the adapter is loaded using SharedPreferences

Question

I have a CustomAdapter for a listview and I need to save all checkbox states from an array of boolean using SharedPreferences, I would like to save the name of the trick (an Arr

Answer 1

Try this adapter code:

public class CustomAdapter0 extends BaseAdapter {
public CustomAdapter0(String listname, String[] tricks, Context context) {
    this.tricks = tricks;
    this.context = context;
    isClicked = new boolean[tricks.length];
    for(int i = 0; i < isClicked.length; i++) isClicked[i] = false;
    this.listname = listname;
}

private String[] tricks;
private Context context;
private boolean[] isClicked;
private LayoutInflater layoutInflater;
private String listname;

@Override
public int getCount() {
    return tricks.length;
}

@Override
public Object getItem(int i) {
    return tricks[i];
}

@Override
public long getItemId(int i) {
    return i;
}

@Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {

    View row = convertView;
    if(convertView == null){
        layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = layoutInflater.inflate(R.layout.custom_listview_tricks, null);
    }
    TextView textView = row.findViewById(R.id.name_xml);
    ImageButton imageButton = row.findViewById(R.id.unmastered_xml);

    textView.setText(tricks[i]);
    if (isClicked[i]) imageButton.setBackgroundResource(R.drawable.mastered);
    else imageButton.setBackgroundResource(R.drawable.unmastered);

    imageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            ImageButton clickedView = (ImageButton) view;
            int clickedPosition = (int)clickedView.getTag();
            isClicked[clickedPosition] = !isClicked[clickedPosition];
            notifyDataSetChanged();

            storeArray();
        }
    });
    imageButton.setTag(i);
    return row;
}

public boolean storeArray() {
    SharedPreferences prefs = context.getSharedPreferences(listname, Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    for(int i = 0; i < tricks.length; i++)
        editor.putBoolean(tricks[i], isClicked[i]);
    return editor.commit();
}

public void loadArray() {
    SharedPreferences prefs = context.getSharedPreferences(listname, Context.MODE_PRIVATE);
    for(int i = 0; i < tricks.length; i++)
        isClicked[i] = prefs.getBoolean(tricks[i], false);
}
}

In Activity, changes those if-statements for initialize the adapter like:

       if (codigo == 0){
        CustomAdapter0 customAdapter0 = new CustomAdapter0("lower", lower, TricksActivity.this);
        listView.setAdapter(customAdapter0);
        customAdapter0.loadArray();

    }if (codigo == 1){

        CustomAdapter0 customAdapter0 = new CustomAdapter0("upper", upper, TricksActivity.this);
        listView.setAdapter(customAdapter0);
        customAdapter0.loadArray();

    }if (codigo == 2){

        CustomAdapter0 customAdapter0 = new CustomAdapter0("sitDown", sitDown, TricksActivity.this);
        listView.setAdapter(customAdapter0);
        customAdapter0.loadArray();

    }if (codigo == 3){

        CustomAdapter0 customAdapter0 = new CustomAdapter0("combosFamosos", combosFamosos, TricksActivity.this);
        listView.setAdapter(customAdapter0);
        customAdapter0.loadArray();
    }

Hope that helps!