使用XmlPullParser解析XML
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内容图文
在XML解析和使用原始XML资源中都涉及过对XML的解析，之前使用的是DOM4J和XmlResourceParser来解析的。本文中将使用XmlPullParser来解析，分别解析不同复杂度的test1.xml、test2.xml、test3.xml。代码如下：
MainActivity：
package com.home.xmlparsetest;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import android.app.Activity;
import android.os.Bundle;
import android.util.Xml;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ExpandableListView;
public class MainActivity extends Activity implements OnClickListener {
private Button parseBtn1;
private Button parseBtn2;
private Button parseBtn3;
private ExpandableListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initWidget();
}
private void initWidget() {
parseBtn1 = (Button) findViewById(R.id.main_btn_test1);
parseBtn1.setOnClickListener(this);
parseBtn2 = (Button) findViewById(R.id.main_btn_test2);
parseBtn2.setOnClickListener(this);
parseBtn3 = (Button) findViewById(R.id.main_btn_test3);
parseBtn3.setOnClickListener(this);
listView = (ExpandableListView) findViewById(R.id.list);
}
@Override
public void onClick(View v) {
if (v == parseBtn1) {
InputStream is = getAssetsStream("test1.xml");
List<ClassBean> list = parseFile1(is);
listView.setAdapter(new MyAdapter(this, list));
} else if (v == parseBtn2) {
InputStream is = getAssetsStream("test2.xml");
List<ClassBean> list = parseFile2(is);
listView.setAdapter(new MyAdapter(this, list));
} else if (v == parseBtn3) {
InputStream is = getAssetsStream("test3.xml");
List<ClassBean> list = parseFile3(is);
listView.setAdapter(new MyAdapter(this, list));
}
}
/**
* 得到Assets里面相应的文件流
*
* @param fileName
* @return
*/
private InputStream getAssetsStream(String fileName) {
InputStream is = null;
try {
is = getAssets().open(fileName);
} catch (IOException e) {
e.printStackTrace();
}
return is;
}
/**
* 解析test1.xml
*
* @param is
* @return list
*/
private List<ClassBean> parseFile1(InputStream is) {
List<ClassBean> list = new ArrayList<ClassBean>();
try {
XmlPullParser parser = Xml.newPullParser();
parser.setInput(is, "utf-8");
int event = parser.getEventType();
while (event != XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
break;
case XmlPullParser.START_TAG:
if ("class".equals(parser.getName())) {
ClassBean bean = new ClassBean();
bean.setId(parser.getAttributeValue(0));
bean.setName(parser.nextText());
list.add(bean);
}
break;
}
event = parser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
/**
* 解析test2.xml
*
* @param is
* @return list
*/
private List<ClassBean> parseFile2(InputStream is) {
List<ClassBean> list = null;
ClassBean bean = null;
List<StudentBean> sList = null;
StudentBean be = null;
try {
XmlPullParser parser = Xml.newPullParser();
parser.setInput(is, "utf-8");
int event = parser.getEventType();
while (event != XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
list = new ArrayList<ClassBean>();
break;
case XmlPullParser.START_TAG:
if ("class".equals(parser.getName())) {
bean = new ClassBean();
bean.setId(parser.getAttributeValue(0));
bean.setName(parser.getAttributeValue(1));
sList = new ArrayList<StudentBean>();
} else if ("student".equals(parser.getName())) {
be = new StudentBean();
be.setId(parser.getAttributeValue(0));
be.setName(parser.nextText());
sList.add(be);
}
break;
case XmlPullParser.END_TAG:
if ("class".equals(parser.getName())) {
bean.setList(sList);
list.add(bean);
bean = null;
}
break;
}
event = parser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
/**
* 解析test3.xml
*
* @param is
* @return list
*/
private List<ClassBean> parseFile3(InputStream is) {
List<ClassBean> list = null;
ClassBean bean = null;
List<StudentBean> sList = null;
StudentBean be = null;
try {
XmlPullParser parser = Xml.newPullParser();
parser.setInput(is, "utf-8");
int event = parser.getEventType();
while (event != XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
list = new ArrayList<ClassBean>();
break;
case XmlPullParser.START_TAG:
if ("class".equals(parser.getName())) {
bean = new ClassBean();
bean.setId(parser.getAttributeValue(0));
bean.setName(parser.getAttributeValue(1));
sList = new ArrayList<StudentBean>();
} else if ("student".equals(parser.getName())) {
be = new StudentBean();
be.setId(parser.getAttributeValue(0));
sList.add(be);
} else if ("name".equals(parser.getName())) {
be.setName(parser.nextText());
} else if ("sex".equals(parser.getName())) {
be.setSex(parser.nextText());
}
break;
case XmlPullParser.END_TAG:
if ("class".equals(parser.getName())) {
bean.setList(sList);
list.add(bean);
bean = null;
}
break;
}
event = parser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
}
MyAdapter：
package com.home.xmlparsetest;
import java.util.List;
import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MyAdapter extends BaseExpandableListAdapter {
private List<ClassBean> classList;
private Context context;
public MyAdapter(Context context, List<ClassBean> classList) {
this.context = context;
this.classList = classList;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
List<StudentBean> sList = classList.get(groupPosition).getList();
StudentBean be = null;
if (sList != null) {
be = sList.get(childPosition);
}
return be;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
LinearLayout ll = new LinearLayout(context);
ll.setOrientation(LinearLayout.HORIZONTAL);
List<StudentBean> sList = classList.get(groupPosition).getList();
if (sList != null && sList.size() > 0
&& sList.get(childPosition).getId() != null) {
TextView tv1 = getTextView2();
tv1.setText(sList.get(childPosition).getId());
ll.addView(tv1);
}
if (sList != null && sList.size() > 0
&& sList.get(childPosition).getName() != null) {
TextView tv2 = getTextView2();
tv2.setText(sList.get(childPosition).getName());
ll.addView(tv2);
}
if (sList != null && sList.size() > 0
&& sList.get(childPosition).getSex() != null) {
TextView tv3 = getTextView2();
tv3.setText(sList.get(childPosition).getSex());
ll.addView(tv3);
}
return ll;
}
@Override
public int getChildrenCount(int groupPosition) {
int size = 0;
List<StudentBean> sList = classList.get(groupPosition).getList();
if (sList != null) {
size = sList.size();
}
return size;
}
@Override
public Object getGroup(int groupPosition) {
return classList.get(groupPosition);
}
@Override
public int getGroupCount() {
return classList.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
LinearLayout ll = new LinearLayout(context);
ll.setOrientation(LinearLayout.HORIZONTAL);
TextView tv1 = getTextView1();
tv1.setText(classList.get(groupPosition).getId());
ll.addView(tv1);
TextView tv2 = getTextView1();
tv2.setText(classList.get(groupPosition).getName());
ll.addView(tv2);
return ll;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
private TextView getTextView1() {
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
lp.setMargins(0, 0, 20, 0);
TextView tv = new TextView(context);
tv.setLayoutParams(lp);
tv.setGravity(Gravity.CENTER_VERTICAL);
tv.setPadding(36, 0, 0, 0);
tv.setTextSize(25);
return tv;
}
private TextView getTextView2() {
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
lp.setMargins(20, 0, 50, 0);
TextView tv = new TextView(context);
tv.setLayoutParams(lp);
tv.setGravity(Gravity.CENTER_VERTICAL);
tv.setPadding(36, 0, 0, 0);
tv.setTextSize(18);
return tv;
}
}
ClassBean实体类：
package com.home.xmlparsetest;
import java.util.List;
public class ClassBean {
private String id;
private String name;
private List<StudentBean> list;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<StudentBean> getList() {
return list;
}
public void setList(List<StudentBean> list) {
this.list = list;
}
}
StudentBean：
package com.home.xmlparsetest;
public class StudentBean {
private String id;
private String name;
private String sex;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
布局文件main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/main_btn_test1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="解析test1" />
<Button
android:id="@+id/main_btn_test2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="解析test2" />
<Button
android:id="@+id/main_btn_test3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="解析test3" />
</LinearLayout>
<ExpandableListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ExpandableListView>
</LinearLayout>
assets里面的test1.xml：
<?xml version="1.0" encoding="utf-8"?>
<classList>
<class id="1">一班</class>
<class id="2">二班</class>
<class id="3">三班</class>
<class id="4">四班</class>
</classList>
assets里面的test2.xml：
<?xml version="1.0" encoding="utf-8"?>
<classList>
<class id="1" name="一班" >
<student id="1" >张三 </student>
<student id="2" >李四 </student>
</class>
<class id="2" name="二班" >
<student id="3" >王五</student>
<student id="4" >赵六</student>
</class>
<class id="3" name="三班" >
<student id="5" >小明</student>
<student id="6" >小高 </student>
</class>
<class id="4" name="四班" >
<student id="7" >小花</student>
<student id="8" >小红 </student>
</class>
</classList>
assets里面的test3.xml：
<?xml version="1.0" encoding="utf-8"?>
<classList>
<class id="1" name="一班" >
<student id="1" >
<name>张三</name>
<sex>男</sex>
</student>
<student id="2" >
<name>李四</name>
<sex>男</sex>
</student>
</class>
<class id="2" name="二班" >
<student id="3" >
<name>王五</name>
<sex>男</sex>
</student>
<student id="4" >
<name>赵六</name>
<sex>男</sex>
</student>
</class>
<class id="3" name="三班" >
<student id="5" >
<name>小明</name>
<sex>男</sex>
</student>
<student id="6" >
<name>小高</name>
<sex>男</sex>
</student>
</class>
<class id="4" name="四班" >
<student id="7" >
<name>小花</name>
<sex>女</sex>
</student>
<student id="8" >
<name>小红</name>
<sex>女</sex>
</student>
</class>
</classList>
原文：http://blog.csdn.net/u010142437/article/details/20132285
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