Android Open Source - android-expandablelistview Field Base Expandable List Adapter

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.app;
//w w  w. j av  a  2  s.  c o  m
import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckedTextView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class FieldBaseExpandableListAdapter extends BaseExpandableListAdapter {

  private static final int[] EMPTY_STATE_SET = {};
  private static final int[] GROUP_EXPANDED_STATE_SET = {android.R.attr.state_expanded};
  private static final int[][] GROUP_STATE_SETS = {
      EMPTY_STATE_SET, // 0
      GROUP_EXPANDED_STATE_SET // 1
  };

  private static int GROUP_BACKGROUND = Color.rgb(255, 255, 224);

    public LayoutInflater inflater;
    public Activity activity;

    List<Field> fields;

    public FieldBaseExpandableListAdapter(Activity act, List<Field> fields) {
        this.activity = act;
        this.inflater = act.getLayoutInflater();
        this.fields = fields;
    }

    @Override
    public int getGroupCount() {
        return fields == null ? 0 : fields.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return fields.get(groupPosition).childrenCount();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return fields.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return fields.get(groupPosition).getChild(childPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

  void adjustGroupView(View rootView, boolean isExpanded, boolean hasChildren) {
    // step 1: adjust group indicator
    ImageView ind = (ImageView) rootView.findViewById(R.id.explist_indicator);
    if (ind != null) {
      if (hasChildren) {
        ind.setVisibility(View.VISIBLE);
        int stateSetIndex = ( isExpanded ? 1 : 0) ;
        Drawable drawable = ind.getDrawable();
        drawable.setState(GROUP_STATE_SETS[stateSetIndex]);
      } else {
        ind.setVisibility(View.INVISIBLE);
      }
    }

    // step 2: adjust background color
    rootView.setBackgroundColor(hasChildren && !isExpanded ? GROUP_BACKGROUND : Color.TRANSPARENT);
  }

  String joinChildValues(Field f) {
    StringBuilder builder = new StringBuilder();
    for (Field cf : f.childFields()) {
      String v = cf.getValue();
      if (v != null && !v.isEmpty()) {
        if (builder.length() > 0)
          builder.append(";");
        builder.append(v);
      }
    }
    return builder.toString();
  }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        final Field f = (Field) getGroup(groupPosition);

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.listrow_group, null);
        }

    boolean hasChildren = f.childrenCount() > 0;
    adjustGroupView(convertView, isExpanded, hasChildren);

        String text = f.getId();

        CheckedTextView viewTag = (CheckedTextView) convertView.findViewById(R.id.tag);
        assert(viewTag != null);
        viewTag.setText(text);

        TextView viewValue = (TextView) convertView.findViewById(R.id.value);
    String value = f.getValue();
    if (!isExpanded && (value == null || value.isEmpty())) {
      value = joinChildValues(f);
    }
        viewValue.setText(value);

        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        final Field f = (Field) getChild(groupPosition, childPosition);

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.listrow_details, null);
        }

        TextView text = (TextView) convertView.findViewById(R.id.tag);
        text.setText(f.getId());

        text = (TextView) convertView.findViewById(R.id.value);
        text.setText(f.getValue());

        convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(activity, f.getValue(), Toast.LENGTH_SHORT).show();
            }
        });
        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }
}

Java Source Code List

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