在android中的可扩展列表

-1

我已经开发了一个xml解析exmaple.here我不得不使用可扩展的listview.but我不能做开发this.please帮助我锄头是做的。在android中的可扩展列表

这是代码：

public class CustomExpandableListExampleActivity extends ExpandableListActivity { 

ExpandableListAdapter mAdapter; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    // Set up our adapter 
    mAdapter = new MyExpandableListAdapter(); 
    setListAdapter(mAdapter); 
    registerForContextMenu(getExpandableListView()); 
} 

@Override 
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 
    menu.setHeaderTitle("Sample menu"); 
    menu.add(0, 0, 0, "Sample action"); 
} 

@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 + ": Child " + childPos + " clicked in group " + groupPos, 
       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 " + groupPos + " clicked", Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

    return false; 
} 

public class MyExpandableListAdapter extends BaseExpandableListAdapter { 
    // Sample data set. children[i] contains the children (String[]) for groups[i]. 
    private String[] groups = { "Order Info", "Customer Info" }; 
    private String[][] children = { 
      { "abc", "xyz", "ash", "anu" }, 
      { "SSE", "TJ", "PM", "SE" }, 

    }; 

    public Object getChild(int groupPosition, int childPosition) { 
     return children[groupPosition][childPosition]; 
    } 

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

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

    public TextView getGenericView() { 
     // Layout parameters for the ExpandableListView 
     AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
       ViewGroup.LayoutParams.MATCH_PARENT, 64); 

     TextView textView = new TextView(CustomExpandableListExampleActivity.this); 
     textView.setLayoutParams(lp); 
     // Center the text vertically 
     textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); 
     // Set the text starting position 
     textView.setPadding(36, 0, 0, 0); 
     return textView; 
    } 

    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, 
      View convertView, ViewGroup parent) { 
     TextView textView = getGenericView(); 
     textView.setText(getChild(groupPosition, childPosition).toString()); 
     return textView; 
    } 

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

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

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

    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, 
      ViewGroup parent) { 
     TextView textView = getGenericView(); 
     textView.setText(getGroup(groupPosition).toString()); 
     return textView; 
    } 

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

    public boolean hasStableIds() { 
     return true; 
    } 

    } 
}

在这里，上面的代码有孩子（ABC，XYZ，灰，ANU）上的项目orderinfomation.but如果我点击订单信息意味着它扩大，并希望显示此singlemenuitem值（payment_method，小计，折扣）.how是do.please帮助我。

public class SingleMenuItemActivity extends Activity { 

// XML node keys 
static final String KEY_ARTIST = "payment_method"; 
static final String KEY_SUBTOTAL = "subtotal"; 
static final String KEY_DISCOUNT = "discount"; 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.single_list_item); 

    // getting intent data 
    Intent in = getIntent(); 

    // Get XML values from previous intent 
    String subtotal = in.getStringExtra(KEY_SUBTOTAL); 
    String discount = in.getStringExtra(KEY_DISCOUNT); 
    String payment_method = in.getStringExtra(KEY_ARTIST); 
    TextView lblSub = (TextView) findViewById(R.id.subtotal_label); 

    TextView lblPayment = (TextView) findViewById(R.id.payment_label); 
    TextView lbldiscount = (TextView) findViewById(R.id.discount_label); 
    lblSub.setText(subtotal); 
    lbldiscount.setText(discount); 
    lblPayment.setText(payment_method); 
    } 
     }

来源

2012-08-10 Krishna Veni

Hey Krsih，你的活动中的setAdapter（）在哪里。我们也找不到您使用过的任何ExpandableListView？ – 2012-08-10 06:57:43

阅读我更新的代码...给我解决方案 – 2012-08-10 07:09:53

在这里，您去创建XML文件ExpandableListView和你activity.Create像below.From活动适配器设置你的项目如下

  Map<String, List<CommonTask>> map = new HashMap<String, List<CommonTask>>(); 

    List<CommonTask> childItem1 = new ArrayList<CommonTask>(); 
    childItem1.add(new CommonTask("Child 1")); 


    List<CommonTask> childItem2 = new ArrayList<CommonTask>(); 
     childItem2.add(new CommonTask("Child 2")); 

      map.put("Parent 1", childItem1); 
    map.put("Parent 2", childItem2); 

      // Set on listview ExpandableListView reference 

      expandListView.setAdapter(adapter);

公共类ExpandableListViewAdapter扩展BaseExpandableListAdapter得到referece {

private static final class ViewHolder { 
    TextView textLabel; 
    TextView groupTextLabel; 

} 

private final Map.Entry<Object, List<Object>> entries[]; 

private final LayoutInflater inflater; 


public ExpandableListViewAdapter(final Context theContext, 
     final Map<String, List<CommonTask>> map) { 
    inflater = LayoutInflater.from(theContext); 

    entries = map.entrySet().toArray(new Map.Entry[0]); 

} 

@Override 
public Object getChild(final int groupPosition, final int childPosition) { 
    final List<Object> childList = entries[groupPosition].getValue(); 

    return childList.get(childPosition); 
} 

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

@Override 
public int getChildrenCount(final int groupPosition) { 

    final List<Object> childList = entries[groupPosition].getValue(); 

    final int childCount = childList.size(); 

    return childCount; 
} 

@Override 
public View getChildView(final int groupPosition, final int childPosition, 
     final boolean isLastChild, final View theConvertView, 
     final ViewGroup parent) { 
    View resultView = theConvertView; 

    ViewHolder holder = null; 

    if (resultView == null) { 
     resultView = inflater.inflate(R.layout.child_layout, null); 

     holder = new ViewHolder(); 

     holder.textLabel = (TextView) resultView.findViewById(R.id.title); 

     resultView.setTag(holder); 
    } else { 
     holder = (ViewHolder) resultView.getTag(); 
    } 

    final Object item = getChild(groupPosition, childPosition); 
    CommonTask commonTask = (CommonTask) item; 
    holder.textLabel.setText(commonTask.getName()); 

    return resultView; 
} 

@Override 
public Object getGroup(final int groupPosition) { 
    return entries[groupPosition].getKey(); 
} 

@Override 
public int getGroupCount() { 
    final int groupCount = entries.length; 

    return groupCount; 
} 

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

@Override 
public View getGroupView(final int groupPosition, final boolean isExpanded, 
     final View theConvertView, final ViewGroup parent) { 
    View resultView = theConvertView; 

    ViewHolder holder = null; 

    if (resultView == null) { 
     resultView = inflater.inflate(R.layout.group_layout, null); 

     holder = new ViewHolder(); 
     holder.groupTextLabel = (TextView) resultView 
       .findViewById(R.id.tvGroup); 

     resultView.setTag(holder); 
    } else { 
     holder = (ViewHolder) resultView.getTag(); 
    } 

    final Object item = getGroup(groupPosition); 

    holder.groupTextLabel.setText(item.toString()); 

    return resultView; 
} 

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

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

}

来源

2012-08-10 07:12:36

首先创建main.xml中的扩展列表，

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 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:id="@+id/android:list" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:groupIndicator="@drawable/group_indicator" 

     android:layout_weight="1" > 
    </ExpandableListView>  
</TextView>  



</LinearLayout>

然后创建group_row.xml XML，

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

<TextView 
    android:id="@+id/tvGroupName" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textSize="16sp" 
    android:textStyle="bold" 
android:layout_gravity="center_vertical" 
    android:paddingLeft="30dp" 
    android:gravity="center_vertical" /> 
</LinearLayout>

然后写child_row.xml代码，

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 


<TextView 
    android:id="@+id/tvPlayerName" 
    android:paddingLeft="50dp" 
    android:layout_width="wrap_content" 
    android:layout_height="30dip" 

    android:gravity="center_vertical"> 

</TextView>  
</LinearLayout>

现在创建group_indicator.xml文件在可绘制文件夹中以定义可扩展列表的样式，

<?xml version="1.0" encoding="utf-8"?> 
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 

    <item android:state_empty="true" android:drawable="@android:color/transparent"></item> 

    <item android:state_expanded="true" android:drawable="@android:color/transparent"></item> 
    <item android:drawable="@android:color/transparent"></item> 
</selector>

现在创建ExpList.java Activity类编写代码，

import android.app.ExpandableListActivity; 
import android.os.Bundle; 
import android.util.DisplayMetrics; 
import android.util.Log; 
import android.view.View; 
import android.widget.ExpandableListView; 
import android.widget.Toast; 
import android.widget.ExpandableListView.OnChildClickListener; 
import android.widget.ExpandableListView.OnGroupCollapseListener; 
import android.widget.ExpandableListView.OnGroupExpandListener; 

public class ExpList extends ExpandableListActivity 
{ 

    static final String arrGroupelements[] = 
     { 
     "India", 
     "Australia", 
     "England", 
     "South Africa" 
     }; 

    static final String arrChildelements[][] = 
     { 
     { 
      "Sachin Tendulkar", 
      "Raina", 
      "Dhoni", 
      "Yuvi" 
     }, 
     { 
      "Ponting", 
      "Adam Gilchrist", 
      "Michael Clarke" 
     }, 
     { 
      "Andrew Strauss", 
      "kevin Peterson", 
      "Nasser Hussain" 
     }, 
     { 
      "Graeme Smith", 
      "AB de villiers", 
      "Jacques Kallis" 
     } 
     }; 

    DisplayMetrics metrics; 
    int width; 
    ExpandableListView expList; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     expList = getExpandableListView(); 
     metrics = new DisplayMetrics(); 
     getWindowManager().getDefaultDisplay().getMetrics(metrics); 
     width = metrics.widthPixels; 

//  this code for adjusting the group indicator into right side of the view 
     expList.setIndicatorBounds(width - GetDipsFromPixel(50), width - GetDipsFromPixel(10)); 
     expList.setAdapter(new ExpAdapter(this)); 


     int groupPosition = 0; 
     expList.expandGroup(0); 

//  if (listView.isGroupExpanded(groupPosition)) 
//   listView.collapseGroup(groupPosition); 
//  else 
//   listView.expandGroup(groupPosition); 

     expList.setOnGroupExpandListener(new OnGroupExpandListener() 
     { 
      @Override 
      public void onGroupExpand(int groupPosition) 
      { 
       Log.d("onGroupExpand", "OK"); 
      } 
     }); 

     expList.setOnGroupCollapseListener(new OnGroupCollapseListener() 
     { 
      @Override 
      public void onGroupCollapse(int groupPosition) 
      { 
       Log.d("onGroupCollapse", "OK"); 
      } 
     }); 

     expList.setOnChildClickListener(new OnChildClickListener() 
     { 
      @Override 
      public boolean onChildClick(ExpandableListView parent, View v, 
        int groupPosition, int childPosition, long id) 
      { 
       Toast.makeText(getApplicationContext(), "" + childPosition , Toast.LENGTH_LONG).show(); 
       Log.d("OnChildClickListener", "OK"); 
       return false; 
      } 
     }); 
    } 

    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); 
    } 
}

现在，最后一件事是创建的扩展列表适配器ExpAdapter.java，

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

public class ExpAdapter extends BaseExpandableListAdapter { 

    static final String arrGroupelements[] = 
    { 
    "India", 
    "Australia", 
    "England", 
    "South Africa" 
}; 

    /** 
    * strings for child elements 
    */ 
static final String arrChildelements[][] = 
{ 
    { 
    "Sachin Tendulkar", 
    "Raina", 
    "Dhoni", 
    "Yuvi" 
    }, 
    { 
    "Ponting", 
    "Adam Gilchrist", 
    "Michael Clarke" 
    }, 
    { 
    "Andrew Strauss", 
    "kevin Peterson", 
    "Nasser Hussain" 
    }, 
    { 
    "Graeme Smith", 
    "AB de villiers", 
    "Jacques Kallis" 
    } 
    }; 
     private Context myContext; 
     public ExpAdapter(Context context) { 
     myContext = context; 
     } 
     @Override 
     public Object getChild(int groupPosition, int childPosition) { 
     return null; 
     } 

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

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

     if (convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.child_row, null); 
     } 

     TextView tvPlayerName = (TextView) convertView.findViewById(R.id.tvPlayerName); 
     tvPlayerName.setText(arrChildelements[groupPosition][childPosition]); 

     return convertView; 
     } 

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

     @Override 
     public Object getGroup(int groupPosition) { 
     return null; 
     } 

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

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

     @Override 
     public View getGroupView(int groupPosition, boolean isExpanded, 
     View convertView, ViewGroup parent) { 

     if (convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.group_row, null); 
     } 

     TextView tvGroupName = (TextView) convertView.findViewById(R.id.tvGroupName); 
     tvGroupName.setText(arrGroupelements[groupPosition]); 

     return convertView; 
     } 

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

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

在这里你去，编译并运行代码。希望它有帮助。

来源

2012-08-28 10:38:54

在android中的可扩展列表

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