XML解析

1.效果图：点击解析，显示books的信息

2.xml：boos.xml

<?xml version="1.0" encoding="utf-8"?>
<books>
    <book price="100" pubDate="2018">Java</book>
    <book price="90" pubDate="2017">Xml</book>
    <book price="80" pubDate="2016">Android</book>
</books>

3.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.app3.MainActivity"
    android:orientation="vertical">


    <Button
        android:id="@+id/bt"
        android:hint="解析"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

4.MainActivity.java

package com.example.app3;

import android.content.res.XmlResourceParser;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.xml.sax.helpers.XMLReaderAdapter;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private Button button;
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.bt);
        textView = (TextView) findViewById(R.id.tv);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                XmlResourceParser xrp = getResources().getXml(R.xml.books);

                try {
                    StringBuffer stringBuffer =  new StringBuffer();
                    while (xrp.getEventType()!=XmlResourceParser.END_DOCUMENT){
                        if(xrp.getEventType() == XmlResourceParser.START_TAG){
                            //获取标签名
                            String bookinfo = xrp.getName();
                            if(bookinfo.equals("book")){
                                String bookprice = xrp.getAttributeValue(0);
                                stringBuffer.append("价格：");
                                stringBuffer.append(bookprice+"  ");

                                String bookDate = xrp.getAttributeValue(null,"pubDate");
                                stringBuffer.append("出版日期:");
                                stringBuffer.append(bookDate+"  ");


                                String bookname = xrp.nextText();
                                stringBuffer.append("作者：");
                                stringBuffer.append(bookname);

                            }
                            stringBuffer.append("
");
                        }
                        xrp.next();
                    }
                    textView.setText(stringBuffer.toString());

                } catch (XmlPullParserException e) {
                    e.printStackTrace();
                }catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}