Android的ExpandableListView-android學習之旅（二十八）

Android的ExpandableListView-android學習之旅（二十八）
ExpandableListView簡介

ExpandableListView是ListView的子類，用法和ListView類似，ExpandableListView可以建立幾個類別，每個類別下面又包括幾個條目，實現了二級目錄。

注意

因為他的資料群組織是二級目錄，所以資料提供者也是有特殊的。
必須是ExpandableListAdapter的子類。

ExpandableListView的屬性

ExpandableListView的執行個體

package peng.liu.testview;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.GridView;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.SimpleAdapter;import android.widget.TextView;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends Activity {    private ExpandableListView exList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ExpandableListAdapter adapter = new BaseExpandableListAdapter() {            int[] imageIds = new int[]{                    R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher            };            String[] listNames = new String[]{                    hello,java,world            };            String[][] names = new String[][]{                    {hello,java,world,python},                    {hello,java,world,python},                    {hello,java,world}            };            @Override            public int getGroupCount() {                return listNames.length;            }            @Override            public int getChildrenCount(int i) {                return names[i].length;            }            @Override            public Object getGroup(int i) {                return listNames[i];            }            @Override            public Object getChild(int i, int i2) {                return names[i][i2];            }            @Override            public long getGroupId(int i) {                return i;            }            @Override            public long getChildId(int i, int i2) {                return i2;            }            @Override            public boolean hasStableIds() {                return true;            }            @Override            public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {                LinearLayout layout = new LinearLayout(MainActivity.this);                ImageView image = new ImageView(MainActivity.this);                image.setImageResource(imageIds[i]);                layout.addView(image);                TextView text = new TextView(MainActivity.this);                text.setText(getGroup(i).toString());                layout.addView(text);                return layout;            }            private TextView getText(){                AbsListView.LayoutParams params = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,64);                TextView text = new TextView(MainActivity.this);                text.setLayoutParams(params);                text.setTextSize(20);                text.setGravity(Gravity.CENTER_HORIZONTAL|Gravity.LEFT);                text.setPadding(36,0,0,0);                return text;            };            @Override            public View getChildView(int i, int i2, boolean b, View view, ViewGroup viewGroup) {                TextView text = getText();                text.setText(getChild(i,i2).toString());                return text;            }            @Override            public boolean isChildSelectable(int i, int i2) {               return true;            }        };        exList = (ExpandableListView) findViewById(R.id.exList);        exList.setAdapter(adapter);    }}