Android XML资源文件

在Android中，我们可以使用任意的XML文件作为资源。

你可以从其生成的资源ID访问xml文件，可以通过它本地化这些资源XML文件。因此，你可以有效地在设备上编译和存储这些XML文件。

XML文件需要存储在 /res/xml 子目录下。

例子

以下代码显示了一个名为 /res/xml/test.xml 的示例XML文件。

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

AAPT在将此XML文件放入应用程序包之前对其进行编译。

下面的代码显示了如何使用 XmlPullParser 来解析这些文件。

Resources res = activity.getResources();
XmlResourceParser xpp = res.getXml(R.xml.test);
/*from www.w3cschool.cn*/
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资源

下面的代码显示了如何解析xml资源。

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代码

/***//from  www.w3cschool.cn
  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());
  }
}