android学生管理系统，利用linerLayout，实现xml的读取和写入，以及按钮的事件处理
16lz
2021-01-25
在这里我只展示，几个类的主要代码
还是一句老话，注意写入权限的使用
操作类
package com.leige.stu.op;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.WriteAbortedException;import java.util.ArrayList;import java.util.List;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlSerializer;import android.os.Environment;import android.util.Log;import android.util.Xml;import com.leige.stu.domain.Student;public class StudentDaoimpl implements StudentDao{//保存到sd卡中@Overridepublic void save(List list){//获取解析器//解析范本/** * * 战三 * 男* 18* * * */XmlSerializer write=Xml.newSerializer();File path=new File(Environment.getExternalStorageDirectory(),"students.xml");try {//实例化输出流FileOutputStream out=new FileOutputStream(path);//解析器绑定输出流，设置编码write.setOutput(out, "utf-8");//开始写xmlwrite.startDocument("utf-8",true);//开始根节点write.startTag(null, "students");//循环写入studentfor(Student stu:list){//子节点studentwrite.startTag(null, "student");//设置idwrite.attribute(null, "id", String.valueOf(stu.getId())); write.startTag(null, "name");//name write.text(stu.getName()); write.endTag(null, "name"); //age write.startTag(null, "age"); write.text(String.valueOf(stu.getAge())); write.endTag(null, "age"); //sex write.startTag(null, "sex"); write.text(stu.getSex()); write.endTag(null, "sex"); write.endTag(null, "student");}write.endTag(null, "students");//结束write.endDocument();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();Log.i("err",e.toString());}}//读取//解析范本/** * * 战三 * 男* 18* * * */@Overridepublic List getStuList(){//获取读取解析器XmlPullParser read=Xml.newPullParser();File path=new File(Environment.getExternalStorageDirectory(),"students.xml");List students=null;Student student=null;try {FileInputStream input=new FileInputStream(path);read.setInput(input,"utf-8");//获取时间类型int eventType=read.getEventType();//设置循环读取while(eventType!=XmlPullParser.END_DOCUMENT){//获取当前节点，名字String eleName=read.getName();switch (eventType) {case XmlPullParser.START_TAG:{if(eleName.equals("students")){//students//建立集合students=new ArrayList();}else if(eleName.equals("student")){//实例化对象student=new Student();//设置id属性student.setId(Integer.parseInt(read.getAttributeValue(null, "id")));}else if(eleName.equals("name")){//name//设置namestudent.setName(read.nextText());}else if(eleName.equals("age")){//agestudent.setAge(Integer.parseInt(read.nextText()));}else if(eleName.equals("sex")){//sexstudent.setSex(read.nextText());}}break;case XmlPullParser.END_TAG:{if(eleName.equals("student")){//加入集合students.add(student);}else if(eleName.equals("students")){return students;}}break;}eventType=read.next();}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}} 主活动类
package com.leige.stu;import java.util.ArrayList;import java.util.List;import java.util.zip.Inflater;import android.app.Activity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.EditText;import android.widget.LinearLayout;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;import com.leige.stu.domain.Student;import com.leige.stu.op.StudentDao;import com.leige.stu.op.StudentDaoimpl;public class MainActivity extends Activity implements OnClickListener{private LinearLayout show=null;private Button add=null;private EditText name=null;private EditText age=null;private Spinner sex=null;private String sexValue;String[] arr;int count=0;//声明操作类StudentDao dao=new StudentDaoimpl();//声明保存集合List students=new ArrayList(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //实例化布局对象 show=(LinearLayout) findViewById(R.id.show); add=(Button) findViewById(R.id.add); name=(EditText) findViewById(R.id.name); age=(EditText) findViewById(R.id.age); sex= (Spinner) findViewById(R.id.sex); arr=new String[]{"男","女"}; //设置下拉菜单内容 ArrayAdapter adapter=new ArrayAdapter(this, android.R.layout.simple_spinner_item,arr); //设置下拉列表的风格 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //设置适配器 sex.setAdapter(adapter); sex.setVisibility(View.VISIBLE); sex.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {// TODO Auto-generated method stubsexValue=arr[position];}@Overridepublic void onNothingSelected(AdapterView<?> parent) {// TODO Auto-generated method stub}}); for(Student stu:dao.getStuList()){ addView(stu); students.add(stu); } } //声明对象Student student;@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.add:{String stuName=name.getText().toString();if(stuName==""||stuName.trim().length()<=0){Toast.makeText(this, "姓名不能为空", Toast.LENGTH_SHORT).show();break;}int stuAge = 0;try {stuAge=Integer.parseInt(age.getText().toString());} catch (Exception e) {Toast.makeText(this, "年龄输入不正确", Toast.LENGTH_SHORT).show();break;}//实例化对象student=new Student();//设置对象 student.setAge(stuAge);student.setId(count++);student.setSex(sexValue);student.setName(stuName);//将students实例化，并把student加入集合students.add(student);addView(student);//清空编辑文本name.setText("");age.setText("");}break;case R.id.save:{if(students!=null){dao.save(students);Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show();}else{Toast.makeText(this, "保存失败", Toast.LENGTH_SHORT).show();}}break;case R.id.cancel:{Toast.makeText(this, "取消保存", Toast.LENGTH_SHORT).show();}break;}}private void addView(Student stu) {// TODO Auto-generated method stub//加载显示文件布局，建议放在外面，因为不必要每次都加在布局文件View view=LayoutInflater.from(this).inflate(R.layout.item, null);TextView show_name=(TextView) view.findViewById(R.id.show_name);TextView show_age=(TextView) view.findViewById(R.id.show_age);TextView show_sex=(TextView) view.findViewById(R.id.show_sex);//设置显示文本show_name.setText(stu.getName());show_age.setText(String.valueOf(stu.getAge()));show_sex.setText(stu.getSex());show.addView(view);} } 布局效果图更多相关文章
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