Android中通过代码读取xml文件中的内容

       在程序升级的时候，每更新一个版本都要写升级日志，将升级日志放在xml文件中，通过代码来读取是一个较好的方案。

关键类：Resources

关键方法：public int getIdentifier(String name, String defType, String defPackage)

updatelog.xml文件位于res/xml/文件夹下：

<?xml version="1.0" encoding="utf-8"?>
<updatelog>
    <release
        version="1.0"
        versioncode="1.1">
        <log>1、这个文件在res/xml文件夹下；</log>
        <log>2、这个文件的名字是“updatelog.xml”</log>
        <log>3、这是一个xml文件</log>
    </release>
</updatelog>

public class ResourcesActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView( R.layout.resources_layout );
		mTextView = ( TextView )findViewById( R.id.textId );
		getFileResources( );
	}
	
	private void getFileResources( ){
		String packageName = getPackageName( );
		try {
			Resources resources = this.getPackageManager( ).getResourcesForApplication( packageName );
			int resId = resources.getIdentifier( "updatelog", "xml", packageName );
			String log = getUpdatelog( resId, resources );
			
			int appId = resources.getIdentifier( "action_settings", "string", packageName );
	        String appName = resources.getString( appId );
	        
			mTextView.setText( appName + "\n" + log );
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
	}
	
	private String parseTag( XmlResourceParser xml ) throws XmlPullParserException, IOException {
        String result = "Version: "+ xml.getAttributeValue(null, "version") + "\n" + "VersionCode: " + xml.getAttributeValue(null, "versioncode") + "\n";
        int eventType = xml.getEventType( );
        while( ( eventType != XmlPullParser.END_TAG ) || ( xml.getName( ).equals( "log" ) ) ) {
            if( (eventType == XmlPullParser.START_TAG) && ( xml.getName( ).equals( "log" ) ) ) {
                eventType = xml.next( );
                result = result + xml.getText( ) + "\n";
            }
            eventType = xml.next( );
        }
        
        return result;
    }
	
	private String getUpdatelog( int resourceId, Resources resource ) {
        String result = "";
        XmlResourceParser xmlResParser = resource.getXml( resourceId );
        try {
            int eventType = xmlResParser.getEventType( );
            while ( eventType != XmlPullParser.END_DOCUMENT ) {
                if ( ( eventType == XmlPullParser.START_TAG ) && ( xmlResParser.getName( ).equals( "release" ) ) ) {
                	result = result + parseTag( xmlResParser );

                }
                eventType = xmlResParser.next( );
            }
        } catch (XmlPullParserException e) {
            System.out.println( e.getMessage( ) );
        } catch (IOException e) {
        	System.out.println( e.getMessage( ) );
        } finally {
        	xmlResParser.close( );
        }
        
        return result;
    }
	
	private TextView mTextView = null;
}