扩展列表视图

Question

我在Android开发新手..
即时通讯使用的可扩展listview， ListView中，我有3 textview和1 button的每一行，按钮点击 我想选择的子数据是另一个activity 与他Group header name是否有可能在Expandable list view 如果它那么如何？ 请帮助...

Answer 1

这将帮助你出来： -

-------------在扩张活动------------- -----

private void loadHosts(final ArrayList<Parent> newParents) { 
     if (newParents == null) 
      return; 
     parents = newParents; 
     Log.d("StackOverFlow", "parents arrived: " + newParents.size()); 
     if (this.getExpandableListAdapter() == null) { 
      mAdapter = new MyExpandableListAdapter(this, parents, R.layout.adapter_horizontal); 
      this.setListAdapter(mAdapter); 
     } else 
      ((MyExpandableListAdapter) getExpandableListAdapter()).notifyDataSetChanged(); 

    } 

// --------------自定义适配器---

import java.util.ArrayList; 

import android.content.Context; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseExpandableListAdapter; 
import android.widget.EditText; 
import android.widget.ImageView; 
import android.widget.TextView; 

import com.merck.activity.R; 

public class MyExpandableListAdapter extends BaseExpandableListAdapter { 

    private LayoutInflater inflater; 
    private ArrayList<Parent> parents; 
    private int parentLayoutResource; 

    /** 
    * A simple adapter which maintains an ArrayList of photo resource Ids. Each 
    * photo is displayed as an image. This adapter supports clearing the list 
    * of photos and adding a new photo. 
    */ 
    public MyExpandableListAdapter(Context context, ArrayList<Parent> parents, int parentLayoutResource) { 
     inflater = LayoutInflater.from(context); 
     this.parents = parents; 
     this.parentLayoutResource = parentLayoutResource; 

    } 

    ImageView img; 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parentView) { 
     final Parent parent = parents.get(groupPosition); 
     convertView = inflater.inflate(parentLayoutResource, null, false); 
     ((TextView) convertView.findViewById(R.id.top)).setText(parent.getName()); 
     img = (ImageView) convertView.findViewById(R.id.arrow); 



     if(!isExpanded){ 
      img.setImageResource(R.drawable.arrow_gray); 
     } 
     else 
     { 
      img.setImageResource(R.drawable.arrow_gray_down); 
     } 
     // CheckBox checkbox = (CheckBox) 
     // convertView.findViewById(R.id.checkbox); 
     // checkbox.setChecked(parent.isChecked()); 
     // if (parent.isChecked()) 
     // convertView.setBackgroundResource(R.color.red); 
     // else 
     // convertView.setBackgroundResource(R.color.blue); 
     // checkbox.setOnCheckedChangeListener(new CheckUpdateListener(parent)); 
     return convertView; 
    } 

    @Override 
    public void onGroupExpanded(int groupPosition) { 

     super.onGroupExpanded(groupPosition); 
    } 

    @Override 
    public void onGroupCollapsed(int groupPosition) { 
     super.onGroupCollapsed(groupPosition); 
    }; 

    private EditText childText1; 
    private EditText childText2; 

    @Override 
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, 
      ViewGroup parentView) { 

     convertView = inflater.inflate(R.layout.user_profile, parentView, false); 
     childText1 = (EditText) convertView.findViewById(R.id.et_password); 
     childText1.addTextChangedListener(new TextWatcher() { 

      @Override 
      public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void afterTextChanged(Editable arg0) { 
       MedListManager.getInstance().setChildText1(arg0.toString()); 
       System.out.println("!!!!! setChildText1"+arg0.toString()); 

      } 
     }); 
     childText2 = (EditText) convertView.findViewById(R.id.et_confirm_pass); 
     childText2.addTextChangedListener(new TextWatcher() { 

      @Override 
      public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void afterTextChanged(Editable arg0) { 
       MedListManager.getInstance().setChildText2(arg0.toString()); 
       System.out.println("!!!!! setChildText2"+arg0.toString()); 

      } 
     }); 
     return convertView; 
    } 

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

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

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return parents.get(groupPosition).getChildren().size(); 
    } 

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

    @Override 
    public int getGroupCount() { 
     return parents.size(); 
    } 

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

    @Override 
    public void notifyDataSetChanged() { 
     super.notifyDataSetChanged(); 
    } 

    @Override 
    public boolean isEmpty() { 
     return ((parents == null) || parents.isEmpty()); 
    } 

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

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

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




} 

Answer 2

对于扩展列表只是执行以下代码：

ExpandableListDemo.java

public class ExpandableListDemo extends Activity { 

     private ExpandableListView expandableListView; 
     private ArrayList<Places> places; 
     private PlaceAdapter placeAdapter; 
     DisplayMetrics metrics; 
     int width; 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_expandable_list_demo); 
      initUI(); 

      initData(); 



      placeAdapter=new PlaceAdapter(places, this); 

      expandableListView.setAdapter(placeAdapter); 

      expandableListView.setIndicatorBounds(width - GetDipsFromPixel(30), width - GetDipsFromPixel(5)); 
     } 

     private void initData() { 
      places=new ArrayList<Places>(); 
      Places place1=new Places(); 
      place1.setName("Maharashtra"); 
      String [] city1={"Pune","Mumbai","Nagpur","Aurangabad","Nasik"}; 
      place1.setCities(city1); 

      Places place2=new Places(); 
      place2.setName("Gujrat"); 
      String [] city2={"Surat","Bhavnagar","Ahmedabad","Vadodara","Rajkot"}; 
      place2.setCities(city2); 

      Places place3=new Places(); 
      place3.setName("AndhraPradesh"); 
      String [] city3={ "Hyderabad", "Visakhapatnam", "Vijayawada", "Guntur", "Rajahmundr" }; 
      place3.setCities(city3); 

      Places place4=new Places(); 
      place4.setName("Karnataka"); 
      String [] city4={"Bagalkote","Bangalore","Belgaum","Bellary"}; 
      place4.setCities(city4); 

      places.add(place1); 
      places.add(place2); 
      places.add(place3); 
      places.add(place4); 

      metrics = new DisplayMetrics(); 
      getWindowManager().getDefaultDisplay().getMetrics(metrics); 
      width = metrics.widthPixels; 
     } 

     private void initUI() { 
      expandableListView=(ExpandableListView) findViewById(R.id.places_listview); 
     } 

     public int GetDipsFromPixel(float pixels) 
     { 
     // Get the screen's density scale 
     final float scale = getResources().getDisplayMetrics().density; 
     // Convert the dps to pixels, based on density scale 
     return (int) (pixels * scale + 0.5f); 
     } 
    } 

定制地方适配器：

public class PlaceAdapter extends BaseExpandableListAdapter{ 

     private ArrayList<Places> placesList; 
     private LayoutInflater mInflater; 

     public PlaceAdapter(ArrayList<Places> placesList,Context context) { 
      this.placesList=placesList; 
      mInflater=LayoutInflater.from(context); 
     } 
     //return child at specific position. 
     @Override 
     public Object getChild(int groupPosition, int childPosition) { 
      return placesList.get(groupPosition).getCities(); 
     } 

     //return child id for specific position. 
     @Override 
     public long getChildId(int groupPosition, int childPosition) { 
      return childPosition; 
     } 

     //return child view at specific position. 
     @Override 
     public View getChildView(int groupPosition, int childPosition, 
       boolean isLastChild, View convertView, ViewGroup parent) { 
      ChildHolder childHolder; 
      if(convertView==null) { 
       childHolder=new ChildHolder(); 
       convertView=mInflater.inflate(R.layout.child_item,null); 
       childHolder.childTv=(TextView) convertView.findViewById(R.id.txt_chid_item); 
       convertView.setTag(childHolder); 
      }else{ 
       childHolder=(ChildHolder) convertView.getTag(); 
      } 

      childHolder.childTv.setText("-->"+placesList.get(groupPosition).getCities()[childPosition]); 
      return convertView; 
     } 

     //return number of child for specific parent. 
     @Override 
     public int getChildrenCount(int groupPosition) { 
      return placesList.get(groupPosition).getCities().length; 
     } 

     //get parent at specific position. 
     @Override 
     public Object getGroup(int groupPosition) { 
      return placesList.get(groupPosition); 
     } 

     //return number of parent items. 
     @Override 
     public int getGroupCount() { 
      return placesList.size(); 
     } 

     //return parent id for specific position 
     @Override 
     public long getGroupId(int groupPosition) { 
      return groupPosition; 
     } 

     //return parent view for specific position 
     @Override 
     public View getGroupView(int groupPosition, boolean isExpanded, 
       View convertView, ViewGroup parent) { 

      ParentHolder parentHolder; 

      if(convertView==null) { 

       parentHolder=new ParentHolder(); 

       convertView=mInflater.inflate(R.layout.parent_item,null); 

       parentHolder.parentTv=(TextView) convertView.findViewById(R.id.txt_parent_item); 

       convertView.setTag(parentHolder); 

      }else{ 
       parentHolder=(ParentHolder) convertView.getTag(); 
      } 
       parentHolder.parentTv.setText(placesList.get(groupPosition).getName()); 
      return convertView; 
     } 

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

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

     private class ParentHolder { 
      TextView parentTv; 
     } 

     private class ChildHolder { 
      TextView childTv; 
     } 

    } 

地方型号：

public class Places { 
    private String name; 
    private String [] cities; 

    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public String[] getCities() { 
     return cities; 
    } 
    public void setCities(String[] cities) { 
     this.cities = cities; 
    } 


} 

activity_expandable_list_demo.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <ExpandableListView 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:id="@+id/places_listview" 
     android:groupIndicator="@drawable/arrow_selector" 
     ></ExpandableListView> 
</RelativeLayout> 

child_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 
    <TextView android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/txt_chid_item"/> 

</RelativeLayout> 

parent_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 
    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/txt_parent_item"/> 

</RelativeLayout> 

的AndroidManifest.xml

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="15" /> 

<application 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name=".ExpandableListDemo" 
     android:label="@string/title_activity_expandable_list_demo" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application> 

（使用上面在绘制图标） 我希望这个代码将更有利于实现可扩展列表视图