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
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<?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> |
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<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：
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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 + "]"; } } |
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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。
