5、ListView 的 Demo
main_list_adapter.xml
xml version ="1.0" encoding ="utf-8" ?>

< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
         android:orientation ="horizontal" android:layout_width ="fill_parent"
         android:layout_height ="fill_parent" >
        
         < TextView android:id ="@+id/text" android:layout_width ="wrap_content"
                 android:layout_height ="wrap_content" android:textSize ="16sp" >
         TextView >
        
LinearLayout >
 
MainListAdapter.java
package com.webabcd.view;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

// 继承 BaseAdapter 以实现自定义的列表适配器
public class MainListAdapter extends BaseAdapter {

         private LayoutInflater mInflater;
         private List mData;

         public MainListAdapter(Context context, List data) {
                mInflater = LayoutInflater.from(context);
                mData = data;
        }

        @Override
         public int getCount() {
                 return mData.size();
        }

        @Override
         public Object getItem( int position) {
                 return mData.get(position);
        }

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

        @Override
         public View getView( int position, View convertView, ViewGroup parent) {

                TextView text;

                 if (convertView == null) {
                         // 指定一个 layout 作为自定义列表适配器的 layout
                        convertView = mInflater.inflate(R.layout.main_list_adapter, null);
                        text = (TextView) convertView.findViewById(R.id.text);
                        convertView.setTag(text);
                } else {
                        text = (TextView) convertView.getTag();
                }
                
                String mItem = mData.get(position);
                text.setText(mItem);
                
                 return convertView;
        }
}
 
Main.java
package com.webabcd.view;

import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

// 此处要继承 ListActivity ，用以实现 ListView 的功能
public class Main extends ListActivity {
        
         private List mData;
        
         /** Called when the activity is first created. */
        @Override
         public void onCreate(Bundle savedInstanceState) {
                 super.onCreate(savedInstanceState);

                setTheme(android.R.style.Theme_Light);
                setContentView(R.layout.main);                
                mData = getData();
                
                 // 使用自定义的列表适配器来展现数据
                MainListAdapter adapter = new MainListAdapter( this, mData);
                
                 // 如需使用系统内置的列表适配器，则可以使用类似如下的方法
                 // ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1, mData);
                
                 this.setListAdapter(adapter);
        }

         // ListView 的数据源
         private List getData()        {
                List items = new ArrayList();
                
                items.add( "TextView");
                items.add( "Button");
                items.add( "ImageButton");
                items.add( "ImageView");
                items.add( "CheckBox");
                items.add( "RadioButton");
                items.add( "AnalogClock");
                items.add( "DigitalClock");
                items.add( "DatePicker");
                items.add( "TimePicker");
                items.add( "ToggleButton");
                items.add( "EditText");
                items.add( "ProgressBar");
                items.add( "SeekBar");
                items.add( "AutoCompleteTextView");
                items.add( "MultiAutoCompleteTextView");
                items.add( "ZoomControls");
                items.add( "Include");
                items.add( "VideoView");
                items.add( "WebView");
                items.add( "RatingBar");
                items.add( "Tab");
                items.add( "Spinner");
                items.add( "Chronometer");
                items.add( "ScrollView");
                items.add( "TextSwitcher");
                items.add( "ListView");
                items.add( "Gallery");
                items.add( "ImageSwitcher");
                items.add( "GridView");
                items.add( "ExpandableList");
                    
                 return items;
        }

         // ListView 中某项被选中后的逻辑
        @Override
         protected void onListItemClick(ListView l, View v, int position, long id) {
                Intent intent = new Intent();
                intent.setClassName( this, "com.webabcd.view._" + mData.get(position));

                startActivityForResult(intent, 0);
        }
}
 
 
6、ExpandableList 的 Demo
_ExpandableList.java
package com.webabcd.view;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

// ExpandableList - 可展开/收缩列表
// 继承 ExpandableListActivity 以实现列表的可展开/收缩的功能
public class _ExpandableList extends ExpandableListActivity {
        
         private ExpandableListAdapter mAdapter;

        @Override
         protected void onCreate(Bundle savedInstanceState) {
                 // TODO Auto-generated method stub
                 super.onCreate(savedInstanceState);

                setTitle( "ExpandableList");
                
                mAdapter = new MyExpandableListAdapter();
                setListAdapter(mAdapter);
                registerForContextMenu( this.getExpandableListView());
        }

         // 为列表的每一项创建上下文菜单（即长按后呼出的菜单）    
        @Override
         public void onCreateContextMenu(ContextMenu menu, View v,
                        ContextMenuInfo menuInfo) {
                menu.setHeaderTitle( "ContextMenu");
                menu.add(0, 0, 0, "ContextMenu");
        }

         // 单击上下文菜单后的逻辑
        @Override
         public boolean onContextItemSelected(MenuItem item) {
                ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
                String title = ((TextView) info.targetView).getText().toString();

                 int type = ExpandableListView.getPackedPositionType(info.packedPosition);
                 if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
                         int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
                         int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);
                        
                        Toast.makeText( this, title + " - Group Index: " + groupPos + " Child Index: " + childPos, Toast.LENGTH_SHORT).show();
                        
                         return true;
                } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
                         int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
                        Toast.makeText( this, title + " - Group Index: " + groupPos, Toast.LENGTH_SHORT).show();
                        
                         return true;
                }

                 return false;
        }

         public class MyExpandableListAdapter extends BaseExpandableListAdapter {

                 // 父列表数据
                 private String[] groups =    
                {    
                         "group1",    
                         "group2",    
                         "group3",
                         "group4"    
                };
                 // 子列表数据
                 private String[][] children =    
                {
                        { "child1" },
                        { "child1", "child2" },
                        { "child1", "child2", "child3" },
                        { "child1", "child2", "child3", "child4" }
                };
                
                @Override
                 public Object getChild( int groupPosition, int childPosition) {
                         return children[groupPosition][childPosition];
                }

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

                @Override
                 public int getChildrenCount( int groupPosition) {
                         return children[groupPosition].length;
                }

                 // 取子列表中的某一项的 View
                @Override
                 public View getChildView( int groupPosition, int childPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent) {
                        TextView textView = getGenericView();
                        textView.setText(getChild(groupPosition, childPosition).toString());
                         return textView;
                }

                @Override
                 public Object getGroup( int groupPosition) {
                         return groups[groupPosition];
                }

                @Override
                 public int getGroupCount() {
                         return groups.length;
                }

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

                 // 取父列表中的某一项的 View
                @Override
                 public View getGroupView( int groupPosition, boolean isExpanded,
                                View convertView, ViewGroup parent) {
                        TextView textView = getGenericView();
                        textView.setText(getGroup(groupPosition).toString());
                         return textView;
                }

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

                @Override
                 public boolean isChildSelectable( int groupPosition, int childPosition) {
                         return true;
                }
                                
                 // 获取某一项的 View 的逻辑
                 private TextView getGenericView() {
                        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                                        ViewGroup.LayoutParams.FILL_PARENT, 48);
                        TextView textView = new TextView(_ExpandableList. this);
                        textView.setLayoutParams(lp);
                        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
                        textView.setPadding(32, 0, 0, 0);
                         return textView;
                }
        }
}
 
 

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