Android实现学生管理系统

本文实例为大家分享了android实现学生管理系统的关键性代码，供大家参考，具体内容如下

局部效果图：

 

实现代码：

1、布局

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.itheima27.sutdentmanager"
 android:versioncode="1"
 android:versionname="1.0" >

 <uses-sdk
  android:minsdkversion="8"
  android:targetsdkversion="17" />
 <uses-permission android:name="android.permission.write_external_storage"/>

 <application
  android:allowbackup="true"
  android:icon="@drawable/ic_launcher"
  android:label="@string/app_name"
  android:theme="@style/apptheme" >
  <activity
   android:name="com.itheima27.sutdentmanager.mainactivity"
   android:label="@string/app_name"
   android:theme="@android:style/theme.notitlebar" >
   <intent-filter>
    <action android:name="android.intent.action.main" />

    <category android:name="android.intent.category.launcher" />
   </intent-filter>
  </activity>
 </application>

</manifest>

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@android:color/white"
 android:orientation="vertical" >

 <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:layout_margintop="5dip"
  android:text="学生管理系统"
  android:textcolor="#99ccff"
  android:textsize="23sp" />

 <relativelayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_margintop="5dip"
  android:padding="5dip" >

  <textview
   android:id="@+id/tv_name"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:paddingleft="15dip"
   android:paddingright="15dip"
   android:text="姓名"
   android:textsize="18sp" />

  <textview
   android:id="@+id/tv_sex"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginleft="5dip"
   android:layout_torightof="@id/tv_name"
   android:paddingleft="15dip"
   android:paddingright="15dip"
   android:text="性别"
   android:textsize="18sp" />

  <textview
   android:id="@+id/tv_age"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginleft="5dip"
   android:layout_torightof="@id/tv_sex"
   android:paddingleft="15dip"
   android:paddingright="15dip"
   android:text="年龄"
   android:textsize="18sp" />

  <edittext
   android:id="@+id/et_name"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignleft="@id/tv_name"
   android:layout_alignright="@id/tv_name"
   android:layout_below="@id/tv_name"
   android:singleline="true" />

  <edittext
   android:id="@+id/et_sex"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignleft="@id/tv_sex"
   android:layout_alignright="@id/tv_sex"
   android:layout_below="@id/tv_sex"
   android:singleline="true" />

  <edittext
   android:id="@+id/et_age"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignleft="@id/tv_age"
   android:layout_alignright="@id/tv_age"
   android:layout_below="@id/tv_age"
   android:inputtype="number"
   android:singleline="true" />

  <button
   android:id="@+id/btn_add_student"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignbaseline="@id/et_age"
   android:layout_torightof="@id/et_age"
   android:text="添加学生"
   android:textsize="20sp" />
 </relativelayout>

 <scrollview
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_weight="1" >

  <linearlayout
   android:id="@+id/ll_student_list"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:layout_margin="1dip"
   android:orientation="vertical"
   android:padding="5dip" >
  </linearlayout>
 </scrollview>

 <linearlayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_margintop="5dip"
  android:orientation="horizontal" >

  <button
   android:id="@+id/btn_save"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:text="保存数据"
   android:textsize="20sp" />

  <button
   android:id="@+id/btn_restore"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:text="恢复数据"
   android:textsize="20sp" />
 </linearlayout>

</linearlayout>

2、关键代码：

package com.itheima27.sutdentmanager.entities;

public class student {

 private string name;
 private string sex;
 private integer age;
 public student(string name, string sex, integer age) {
  super();
  this.name = name;
  this.sex = sex;
  this.age = age;
 }
 public student() {
  super();
  // todo auto-generated constructor stub
 }
 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;
 }
 public integer getage() {
  return age;
 }
 public void setage(integer age) {
  this.age = age;
 }
 @override
 public string tostring() {
  return "student [name=" + name + ", sex=" + sex + ", age=" + age + "]";
 }
}

package com.itheima27.sutdentmanager;

import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.util.arraylist;
import java.util.list;

import org.xmlpull.v1.xmlpullparser;
import org.xmlpull.v1.xmlpullparserexception;
import org.xmlpull.v1.xmlserializer;

import com.itheima27.sutdentmanager.entities.student;

import android.os.bundle;
import android.os.environment;
import android.app.activity;
import android.graphics.color;
import android.text.textutils;
import android.util.xml;
import android.view.menu;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.edittext;
import android.widget.linearlayout;
import android.widget.textview;
import android.widget.toast;

public class mainactivity extends activity implements onclicklistener {

 private edittext etname;
 private edittext etsex;
 private edittext etage;
 private linearlayout llstudentlist;
 private list<student> studentlist;
 private string filepath;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);

  init();
 }

 private void init() {
  etname = (edittext) findviewbyid(r.id.et_name);
  etsex = (edittext) findviewbyid(r.id.et_sex);
  etage = (edittext) findviewbyid(r.id.et_age);

  llstudentlist = (linearlayout) findviewbyid(r.id.ll_student_list);

  findviewbyid(r.id.btn_save).setonclicklistener(this);
  findviewbyid(r.id.btn_restore).setonclicklistener(this);
  findviewbyid(r.id.btn_add_student).setonclicklistener(this);

  studentlist = new arraylist<student>();
  filepath = environment.getexternalstoragedirectory().getpath() + "/student.xml";
 }

 @override
 public void onclick(view v) {
  switch (v.getid()) {
  case r.id.btn_save:
   if(studentlist.size() > 0) {
    if(savestudent2local()) {
     toast.maketext(this, "保存成功", 0).show();
    } else {
     toast.maketext(this, "保存失败", 0).show();
    }
   } else {
    toast.maketext(this, "当前没有数据", 0).show();
   }
   break;
  case r.id.btn_restore:
   if(restorestudentfromlocal()) {
    toast.maketext(this, "恢复成功", 0).show();
   } else {
    toast.maketext(this, "恢复失败", 0).show();
   }
   break;
  case r.id.btn_add_student:
   addstudent();
   break;
  default:
   break;
  }
 }

 private boolean restorestudentfromlocal() {
  try {
   xmlpullparser parser = xml.newpullparser();
   parser.setinput(new fileinputstream(filepath), "utf-8");

   int eventtype = parser.geteventtype();

   studentlist.clear();

   student student = null;
   string nodename = null;
   while(eventtype != xmlpullparser.end_document) {
    nodename = parser.getname();
    switch (eventtype) {
    case xmlpullparser.start_tag:
     if("student".equals(nodename)) {
      student = new student();
     } else if("name".equals(nodename)) {
      student.setname(parser.nexttext());
     } else if("sex".equals(nodename)) {
      student.setsex(parser.nexttext());
     } else if("age".equals(nodename)) {
      student.setage(integer.valueof(parser.nexttext()));
     }
     break;
    case xmlpullparser.end_tag:
     if("student".equals(nodename)) {
      studentlist.add(student);
     }
     break;
    default:
     break;
    }
    eventtype = parser.next();
   }
   refreshstudentlist();

   return true;
  } catch (exception e) {
   e.printstacktrace();
  }
  return false;
 }

 private void refreshstudentlist() {
  llstudentlist.removeallviews();
  textview childview;
  for (student student : studentlist) {
   childview = new textview(this);
   childview.settextsize(23);
   childview.settextcolor(color.black);
   childview.settext("　　" + student.getname() + "　　" + student.getsex() + "　　" + student.getage());
   llstudentlist.addview(childview);
  }
 }

 private boolean savestudent2local() {
  try {
   xmlserializer serializer = xml.newserializer();
   serializer.setoutput(new fileoutputstream(filepath), "utf-8");

   serializer.startdocument("utf-8", true);
   serializer.starttag(null, "infos");
   for (student stu : studentlist) {
    serializer.starttag(null, "student");

    serializer.starttag(null, "name");
    serializer.text(stu.getname());
    serializer.endtag(null, "name");

    serializer.starttag(null, "sex");
    serializer.text(stu.getsex());
    serializer.endtag(null, "sex");

    serializer.starttag(null, "age");
    serializer.text(string.valueof(stu.getage()));
    serializer.endtag(null, "age");

    serializer.endtag(null, "student");
   }
   serializer.endtag(null, "infos");
   serializer.enddocument();
   return true;
  } catch (exception e) {
   e.printstacktrace();
  }
  return false;
 }

 private void addstudent() {
  string name = etname.gettext().tostring();
  string sex = etsex.gettext().tostring();
  string age = etage.gettext().tostring();

  if(!textutils.isempty(name)
    && !textutils.isempty(sex)
    && !textutils.isempty(age)) {
   studentlist.add(new student(name, sex, integer.valueof(age)));
   textview childview = new textview(this);
   childview.settextsize(23);
   childview.settextcolor(color.black);
   childview.settext("　　" + name + "　　" + sex + "　　" + age);
   llstudentlist.addview(childview);
  } else {
   toast.maketext(this, "请正确输入", 0).show();
  }
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助。