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05_学生管理系统，xml读写，布局的综合应用

發布時間：2024/9/27 windows 27 豆豆

生活随笔收集整理的這篇文章主要介紹了 05_学生管理系统，xml读写，布局的综合应用小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

最終要做的項目目標：

2、編寫Android清單文件AndroidManifest.xml

<?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="19" />

??? <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" >

??????????? <intent-filter>

??????????????? <action android:name="android.intent.action.MAIN" />

??????????????? <category android:name="android.intent.category.LAUNCHER" />

??????????? </intent-filter>

??????? </activity>

??? </application>

</manifest>

3 編寫布局文件activity_main.xml????????????????????????

<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="學生管理系統"

??????? 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="性別"

??????????? 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="年齡"

??????????? 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="添加學生"

??????????? 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="保存數據"

??????????? 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="恢復數據"

??????????? android:textSize="20sp" />

??? </LinearLayout>

</LinearLayout>

4 編寫Student實體

package com.itheima27.sutdentmanager.entities;

public class Student {

??? private String name;

??? private String sex;

??? private Integer age;

??? public Student() {

?????? super();

??? }

??? public Student(String name, String sex, Integer age) {

?????? super();

?????? this.name = name;

?????? this.sex = sex;

?????? this.age = age;

??? }

??? 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 + "]";

??? }

}

5 編寫MainActivity

package com.itheima27.sutdentmanager;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.ArrayList;

import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlSerializer;

import android.graphics.Color;

import android.os.Bundle;

import android.os.Environment;

import android.support.v7.app.ActionBarActivity;

import android.text.TextUtils;

import android.util.Xml;

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;

import com.itheima27.sutdentmanager.entities.Student;

public class MainActivity extends ActionBarActivity 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";

??? }

??? public void onClick(View v) {

?????? switch (v.getId()) {

?????? case R.id.btn_save:

?????????? if(studentList.size() > 0) {

????????????? //將信息寫到xml文件中

????????????? if(saveStudent2Local()) {

????????????????? Toast.makeText(this, "保存成功", 0).show();

????????????? } else {

????????????????? Toast.makeText(this, "保存失敗", 0).show();

????????????? }

?????????? } else {

????????????? Toast.makeText(this, "當前沒有數據", 0).show();

??? ??? ??? }

?????????? break;

??????????

?????? case R.id.btn_restore:

?????????? if(restoreStudentFromLocal()) {

????????????? Toast.makeText(this, "恢復成功", 0).show();

?????????? } else {

????????????? Toast.makeText(this, "恢復失敗", 0).show();

?????????? }

?????????? break;

?????? case R.id.btn_add_student:

?????????? addStudent();

?????????? break;

?????? default:

?????????? break;

?????? }

??? }

???

??? /**

??? ?* 從xml中讀出Student數據

??? ?* @return

??? ?*/

??? 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;

??? }

???

??? /**

??? ?* 恢復student的List列表

??? ?*/

??? 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, "請正確輸入", 0).show();

?????? }

??? }

}

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