Android XML資源文件

在Android中，我們可以使用任意的XML文件作為資源。

你可以從其生成的資源ID訪問xml文件，可以通過它本地化這些資源XML文件。因此，你可以有效地在設(shè)備上編譯和存儲這些XML文件。

XML文件需要存儲在 /res/xml 子目錄下。

例子

以下代碼顯示了一個名為 /res/xml/test.xml 的示例XML文件。

<root>
   <sub>
      Hello World from an xml sub element
   </sub>
</root>

AAPT在將此XML文件放入應(yīng)用程序包之前對其進行編譯。

下面的代碼顯示了如何使用 XmlPullParser 來解析這些文件。

Resources res = activity.getResources();
XmlResourceParser xpp = res.getXml(R.xml.test);
/*from m.o2fo.com*/
private String getEventsFromAnXMLFile(Activity activity) throws XmlPullParserException, IOException
{
   StringBuffer sb = new StringBuffer();
   Resources res = activity.getResources();
   XmlResourceParser xpp = res.getXml(R.xml.test);

   xpp.next();
   int eventType = xpp.getEventType();
    while (eventType != XmlPullParser.END_DOCUMENT)
    {
        if(eventType == XmlPullParser.START_DOCUMENT)
        {
           System.out.println("Start document");
        }
        else if(eventType == XmlPullParser.START_TAG)
        {
           System.out.println("Start tag "+xpp.getName());
        }
        else if(eventType == XmlPullParser.END_TAG)
        {
           System.out.println("End tag "+xpp.getName());
        }
        else if(eventType == XmlPullParser.TEXT)
        {
           System.out.println("Text "+xpp.getText());
        }
        eventType = xpp.next();
    }
    return sb.toString();
}

解析xml資源

下面的代碼顯示了如何解析xml資源。

主Activity xml布局

<?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" >
  <TextView
    android:id="@+id/selection"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
  />
  <ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:drawSelectorOnTop="false"
  />
</LinearLayout>

res/xml/words.cml

<words>
  <word value="lorem" />
  <word value="ipsum" />
  <word value="dolor" />
  <word value="sit" />
  <word value="amet" />
  <word value="consectetuer" />
  <word value="adipiscing" />
  <word value="elit" />
  <word value="morbi" />
  <word value="vel" />
  <word value="ligula" />
  <word value="vitae" />
  <word value="arcu" />
  <word value="aliquet" />
  <word value="mollis" />
  <word value="etiam" />
  <word value="vel" />
  <word value="erat" />
  <word value="placerat" />
  <word value="ante" />
  <word value="porttitor" />
  <word value="sodales" />
  <word value="pellentesque" />
  <word value="augue" />
  <word value="purus" />
</words>

Java代碼

/***//from  m.o2fo.com
  Copyright (c) 2008-2009 CommonsWare, LLC
  
  Licensed under the Apache License, Version 2.0 (the "License"); you may
  not use this file except in compliance with the License. You may obtain
  a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/


import android.app.Activity;
import android.os.Bundle;
import android.app.ListActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.InputStream;
import java.util.ArrayList;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

public class MainActivity extends ListActivity {
  TextView selection;
  ArrayList<String> items=new ArrayList<String>();
  
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    selection=(TextView)findViewById(R.id.selection);
    
    try {
      XmlPullParser xpp=getResources().getXml(R.xml.words);
      
      while (xpp.getEventType()!=XmlPullParser.END_DOCUMENT) {
        if (xpp.getEventType()==XmlPullParser.START_TAG) {
          if (xpp.getName().equals("word")) {
            items.add(xpp.getAttributeValue(0));
          }
        }
        
        xpp.next();
      }
    }
    catch (Throwable t) {
      Toast
        .makeText(this, "Request failed: "+t.toString(), 4000)
        .show();
    }
    
    setListAdapter(new ArrayAdapter<String>(this,
                            android.R.layout.simple_list_item_1,
                            items));
  }
  
  public void onListItemClick(ListView parent, View v, int position,
                  long id) {
    selection.setText(items.get(position).toString());
  }
}