Android realizes student management system _android

This example for you to share the Android implementation of the student management system of key code for your reference, the specific content as follows

Local Effect Chart:

Implementation code:

1, layout

<?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 "> <u SES-SDK android:minsdkversion= "8" android:targetsdkversion= "/> <uses-permission android:name=" Andro Id.permission.WRITE_EXTERNAL_STORAGE "/> <application android:allowbackup=" true "android:icon=" @drawab Le/ic_launcher "android:label=" @string/app_name "android:theme=" @style/apptheme "> <activity A Ndroid:name= "com.itheima27.sutdentmanager.MainActivity" android:label= "@string/app_name" Android:theme= "@and Roid:style/theme.notitlebar "> <intent-filter> <action android:name=" Android.intent.action.MAI 
    N "/> <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:lay Out_gravity= "Center_horizontal" android:layout_margintop= "5dip" "android:text=" Student Management System "android:textcolor=" #9 9CCFF "android:textsize=" 23sp "/> <relativelayout android:layout_width=" Fill_parent "Android:lay 
      out_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" a ndroid:paddingleft= "15dip" android:paddingright= "15dip" android:text= "name" android:textsize= "18SP"/&G 
 
    T <textview andRoid:id= "@+id/tv_sex" android:layout_width= "wrap_content" android:layout_height= "Wrap_content" Androi d:layout_marginleft= "5dip" android:layout_torightof= "@id/tv_name" android:paddingleft= "15dip" Android :p addingright= "15dip" android:text= "Sex" 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:paddingr ight= "15dip" android:text= "Age" android:textsize= "18sp"/> <edittext android:id= "@+id/et_" Name "android:layout_width=" Wrap_content "android:layout_height=" Wrap_content "Android:layout_alignle ft= "@id/tv_name" android:layout_alignright= "@id/tv_name" android:layout_below= "@id/tv_name" android:s 
Ingleline= "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=" numb Er "android:singleline=" true "/> <button android:id=" @+id/btn_add_student "android:layou 
      T_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_alignbaseline= "@id/et_age" android:layout_torightof= "@id/et_age" android:text= "add Student" android:textsize= "20sp"/> </relativelay Out> &LT;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:paddi ng= "5dip" > </LinearLayout> </ScrollView> <linearlayout android:layout_width= "Fill_par Ent "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= "Save Data" android:textsize= "20SP"/> <button android:id= "@+id/btn_restore" android:layout_width= "Wrap_content" Android:layout_heigh 
      t= "Wrap_content"android:layout_weight= "1" android:text= "restore Data" android:textsize= "20sp"/> </LinearLayout> < 
 /linearlayout>

2, Key code:

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 () &GT 
        0) {if (savestudent2local ()) {Toast.maketext (this, "Save Success", 0). Show (); 
        else {Toast.maketext (this, save failed, 0). Show (); 
      } else {Toast.maketext (this, "No data currently", 0). Show (); 
    } break; 
      Case R.id.btn_restore:if (restorestudentfromlocal ()) {Toast.maketext (this, "restore Success", 0). Show (); 
      else {Toast.maketext (this, restore failed, 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)) {Stude 
          NT = 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 (the 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, "Please enter correctly", 0). Show (); 
  }} 
} 
 

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