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。