1. 首頁
  2. 問答
  3. 如何使用帶有可展開列表的xml佈局？

如何使用帶有可展開列表的xml佈局？

2011-10-25 53 views
2

嗨我有這個可擴展列表，當我嘗試使用此代碼將其連接到xml文件時出現錯誤。如何使用帶有可展開列表的xml佈局？

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

使用此代碼當我按鈕重定向到整個java文件時，我得到一個強制關閉。 （看看下面全碼） 登錄貓這樣說：

10-25 17：37：39.512：ERROR/AndroidRuntime（547）： 了java.lang.RuntimeException：無法啓動活動 ComponentInfo {COM .sammy.umass/com.sammy.umass.DirectionsScreenActivity}： 了java.lang.RuntimeException：您的內容必須有一個 ExpandableListView其id屬性爲 'android.R.id.list'

我只需要刪除標題欄，添加一個背景圖像，基本上它很漂亮。

全碼：

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代碼

<?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>

來源

2011-10-25 Sammy Kumar

回答

4

當使用ExpandableListAdapter，所供給的XML佈局需要有在其與設置爲android.R id屬性的ExpandableListView元件。 id.list。您的問題出現在您的directions.xml佈局中。確保在您的directions.xml中有一個ExpandableListView元素，並且它的id屬性設置爲andoird.R.id.list。你需要做這在您的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>

來源

2011-10-25 17:54:12

+0

編輯爲包含xml代碼！謝謝！ –

+0

讓它工作！謝謝 –

+0

編輯爲規範的目的。使用了@LalitPoptani發佈的代碼，併爲他提供了讚譽。 –

3

你將不得不在XML文件中添加的Android內置的ID爲ExpandableListView像下面，並使用刪除您通過自己的申報ID android:id="@+id/anyname"

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

來源

2011-10-25 17:57:30

+0

+1提供確切代碼 –

+0

謝謝！按預期工作！ –

相關問題

 相關問題