Using ExpandableListView : ListView « UI « Android

1. Android
2. UI
3. ListView

Using ExpandableListView

   
package app.test;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ExpandableListView;

import android.content.Context;
import android.graphics.Typeface;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class Test extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ExpandableListView list = new ExpandableListView(this);
        list.setGroupIndicator(null);
        list.setChildIndicator(null);
        String[] titles = {"A","B","C"};
        String[] fruits = {"a1","a2"};
        String[] veggies = {"b1","b2","b3"};
        String[] meats = {"c1","c2"};
        String[][] contents = {fruits,veggies,meats};
        SimplerExpandableListAdapter adapter = new SimplerExpandableListAdapter(this,
            titles, contents);

        list.setAdapter(adapter);
        setContentView(list);

    }
}


 class SimplerExpandableListAdapter extends BaseExpandableListAdapter {
  private Context mContext;
  private String[][] mContents;
  private String[] mTitles;
  
  public SimplerExpandableListAdapter(Context context, String[] titles, String[][] contents) {
    super();
    if(titles.length != contents.length) {
      throw new IllegalArgumentException("Titles and Contents must be the same size.");
    }
    
    mContext = context;
    mContents = contents;
    mTitles = titles;
  }
  @Override
  public String getChild(int groupPosition, int childPosition) {
    return mContents[groupPosition][childPosition];
  }
  @Override
  public long getChildId(int groupPosition, int childPosition) {
    return 0;
  }
  @Override
  public View getChildView(int groupPosition, int childPosition,
      boolean isLastChild, View convertView, ViewGroup parent) {
    TextView row = (TextView)convertView;
    if(row == null) {
      row = new TextView(mContext);
    }
    row.setText(mContents[groupPosition][childPosition]);
    return row;
  }
  @Override
  public int getChildrenCount(int groupPosition) {
    return mContents[groupPosition].length;
  }
  @Override
  public String[] getGroup(int groupPosition) {
    return mContents[groupPosition];
  }
  @Override
  public int getGroupCount() {
    return mContents.length;
  }
  @Override
  public long getGroupId(int groupPosition) {
    return 0;
  }
  @Override
  public View getGroupView(int groupPosition, boolean isExpanded,
      View convertView, ViewGroup parent) {
    TextView row = (TextView)convertView;
    if(row == null) {
      row = new TextView(mContext);
    }
    row.setTypeface(Typeface.DEFAULT_BOLD);
    row.setText(mTitles[groupPosition]);
    return row;
  }

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

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

}

   
    
    
  

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