android 中解析XML的方法
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>