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如何使用带有可展开列表的xml布局？

2011-10-25 47 views
2

嗨我有这个可扩展列表，当我尝试使用此代码将其连接到xml文件时出现错误。如何使用带有可展开列表的xml布局？

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.directions); 
    // Set up our adapter 
    mAdapter = new MyExpandableListAdapter(); 
    setListAdapter(mAdapter); 
    registerForContextMenu(getExpandableListView()); 
}

使用此代码当我按钮重定向到整个java文件时，我得到一个强制关闭。 （看看下面全码） 登录猫这样说：

10-25 17：37：39.512：ERROR/AndroidRuntime（547）： 了java.lang.RuntimeException：无法启动活动 ComponentInfo {COM .sammy.umass/com.sammy.umass.DirectionsScreenActivity}： 了java.lang.RuntimeException：您的内容必须有一个 ExpandableListView其id属性为 'android.R.id.list'

我只需要删除标题栏，添加一个背景图像，基本上它很漂亮。

全码：

package com.sammy.umass; 

import android.app.ExpandableListActivity; 
import android.content.Intent; 
import android.net.Uri; 
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; 


public class DirectionsScreenActivity extends ExpandableListActivity { 
ExpandableListAdapter mAdapter; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.directions); 
    // 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, R.string.expandable_list_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; 
} 

/** 
* 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 class MyExpandableListAdapter extends BaseExpandableListAdapter { 
    // Sample data set. children[i] contains the children (String[]) for groups[i]. 
    private String[] groups = { " Academic Buildings", " Residential Buildings", " Dining Commons", " All Buildings A-Z" }; 
    private String[][] children = { 
      //Academic Buildings 
      { "Agricultural Engineering Bldg", "Army ROTC Bldg", "Arnold House", "(Studio) Arts Building" }, 
      //Residence Halls 
      { "Baker Hall", "Brett Hall", "Brooks Hall", "Brown Hall","Butterfield Hall","Cance Hall","Cashin Hall","Chadboourne Hall", 
       "Coolidge Hall","Crabtree Hall","Crampton Hall","Dickinson Hall","Dwight Hall","Emerson Hall","Field Hall", 
       "Gorman Hall","Grayson Hall","Greenough Hall","Hamlin Hall","James Hall","John Adams Hall","John Quincy Adams Hall", 
       "Johnson Hall","Kennedy Hall","Knowlton Hall","Leach Hall","Lewis Hall","Lincoln Apts","Mackimmie Hall","Mary Lyon Hall", 
       "McNamara Hall","Melville Hall","Moore Hall","North Residence A","North Residence B","North Residence C","North Residence D", 
       "North Village Apts","Patterson Hall","Pierpont Hall","Prince Hall","Thatcher Hall","Thoreau Hall","Van Meter Hall", 
       "Washington Hall","Webster Hall","Wheeler Hall"}, 
      //Dining Commons 
      { "Berkshire", "Franklin","Hampden","Hampshire","Worcester" }, 
      { "Agricultural Engineering Bldg", "Army ROTC Bldg", "Arnold House", "(Studio) Arts Building" } 
    }; 

    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(DirectionsScreenActivity.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(final int groupPosition,final int childPosition, boolean isLastChild, 
      View convertView, ViewGroup parent) { 
     TextView textView = getGenericView(); 
     textView.setText(getChild(groupPosition, childPosition).toString()); 
     textView.setOnClickListener(new View.OnClickListener(){ 
      public void onClick(View view){ 
      Uri uriToOpen = getUriForView(groupPosition, childPosition); 
      Intent i = new Intent(Intent.ACTION_VIEW, uriToOpen); 
      startActivity(i); 
      } 

     private Uri getUriForView(int groupPosition, int childPosition) 
     { 
      //Academic Builds 
      //Residence Halls 
      if(groupPosition == 1 && childPosition == 0) 
       return Uri.parse("google.navigation:q=160+Clark+Hill+Road+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 1) 
       return Uri.parse("google.navigation:q=151+Infirmary+Way+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 2) 
       return Uri.parse("google.navigation:q=160+Infirmary+Way+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 3) 
       return Uri.parse("google.navigation:q=92+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 4) 
       return Uri.parse("google.navigation:q=171+Infirmary+Way+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 5) 
       return Uri.parse("google.navigation:q=191+Fearing+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 6) 
       return Uri.parse("google.navigation:q=112+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 7) 
       return Uri.parse("google.navigation:q=110+Orchard+Hill+Drive+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 8) 
       return Uri.parse("google.navigation:q=630+Massachusetts+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 9) 
       return Uri.parse("google.navigation:q=17+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 10) 
       return Uri.parse("google.navigation:q=256+Sunset+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 11) 
       return Uri.parse("google.navigation:q=151+Orchard+Hill+Drive+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 12) 
       return Uri.parse("google.navigation:q=41+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 13) 
       return Uri.parse("google.navigation:q=151+Southwest+Circle+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 14) 
       return Uri.parse("google.navigation:q=171+Orchard+Hill+Drive+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 15) 
       return Uri.parse("google.navigation:q=90+Butterfield+Terrace+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 16) 
       return Uri.parse("google.navigation:q=161+Orchard+Hill+Drive+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 17) 
       return Uri.parse("google.navigation:q=120+Orchard+Hill+Drive+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 18) 
       return Uri.parse("google.navigation:q=739+North+Pleasant+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 19) 
       return Uri.parse("google.navigation:q=660+Massachusetts+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 20) 
       return Uri.parse("google.navigation:q=161+Fearing+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 21) 
       return Uri.parse("google.navigation:q=171+Fearing+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 22) 
       return Uri.parse("google.navigation:q=380+Thatcher+Road+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 23) 
       return Uri.parse("google.navigation:q=42.38421349589919+-72.52963542938232"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 24) 
       return Uri.parse("google.navigation:q=691+North+Pleasant+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 25) 
       return Uri.parse("google.navigation:q=21+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 26) 
       return Uri.parse("google.navigation:q=340+Thatcher+Road+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 27) 
       return Uri.parse("google.navigation:q=341+Lincoln+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 28) 
       return Uri.parse("google.navigation:q=230+Sunset+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 29) 
       return Uri.parse("google.navigation:q=43+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 30) 
       return Uri.parse("google.navigation:q=102+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 31) 
       return Uri.parse("google.navigation:q=650+Massachusetts+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 32) 
       return Uri.parse("google.navigation:q=111+Southwest+Circle+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 33) 
       return Uri.parse("google.navigation:q=56+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 34) 
       return Uri.parse("google.navigation:q=58+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 35) 
       return Uri.parse("google.navigation:q=54+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 36) 
       return Uri.parse("google.navigation:q=52+Eastman+Lane+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 37) 
       return Uri.parse("google.navigation:q=990+North+Pleasant+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 38) 
       return Uri.parse("google.navigation:q=204+Sunset+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 39) 
       return Uri.parse("google.navigation:q=201+Fearing+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 40) 
       return Uri.parse("google.navigation:q=286+Sunset+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 41) 
       return Uri.parse("google.navigation:q=300+Thatcher+Road+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 42) 
       return Uri.parse("google.navigation:q=640+Massachusetts+Avenue+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 43) 
       return Uri.parse("google.navigation:q=180+Clark+Hil+Road+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 44) 
       return Uri.parse("google.navigation:q=181+Fearing+Street+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 45) 
       return Uri.parse("google.navigation:q=141+Orchard+Hill+Drive+Amherst+MA+01003"+"&mode=w"); 
      if(groupPosition == 1 && childPosition == 46) 
       return Uri.parse("google.navigation:q=171+Infirmary+Way+Amherst+MA+01003"+"&mode=w"); 
      //Dining Commons 
      //All Buildings 
      return null; 
     } 
     }); 

     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; 
    } 



} 
}

XML代码

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

来源

2011-10-25 Sammy Kumar

回答

4

当使用ExpandableListAdapter，所供给的XML布局需要有在其与设置为android.R id属性的ExpandableListView元件。 id.list。您的问题出现在您的directions.xml布局中。确保在您的directions.xml中有一个ExpandableListView元素，并且它的id属性设置为andoird.R.id.list。你需要做这在您的directoions.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
> 
     <ExpandableListView 
     android:id="@android:id/list" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"> 
     </ExpandableListView> 

</LinearLayout>

来源

2011-10-25 17:54:12

+0

编辑为包含xml代码！谢谢！ –

+0

让它工作！谢谢 –

+0

编辑为规范的目的。使用了@LalitPoptani发布的代码，并为他提供了赞誉。 –

3

你将不得不在XML文件中添加的Android内置的ID为ExpandableListView像下面，并使用删除您通过自己的申报ID android:id="@+id/anyname"

 <ExpandableListView 
     android:id="@android:id/list" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"> 
     </ExpandableListView>

来源

2011-10-25 17:57:30

+0

+1提供确切代码 –

+0

谢谢！按预期工作！ –

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