简单的学生管理系统

最新推荐文章于 2023-02-21 19:25:44 发布

转载最新推荐文章于 2023-02-21 19:25:44 发布 · 432 阅读

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mainactivity 配置文件

package com.example.student;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
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.example.student.entities.Student;

import android.R.color;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Environment;
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;

public class MainActivity extends Activity implements OnClickListener {

	private LinearLayout ll;
	private EditText et_name;
	private EditText et_sex;
	private EditText et_age;
	private List<Student> studentList;
	private String filePath;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		init();
	}
	

	
	/**
	 * 初始化控件
	 */
	private void init() {
		et_name = (EditText) findViewById(R.id.main_et_name);
		et_sex = (EditText) findViewById(R.id.main_et_sex);
		et_age = (EditText) findViewById(R.id.main_et_age);
		
		ll = (LinearLayout) findViewById(R.id.main_ll);
		
		findViewById(R.id.main_bt_save).setOnClickListener(this);
		findViewById(R.id.main_bt_recover).setOnClickListener(this);
		findViewById(R.id.main_bt_add).setOnClickListener(this);
		
		studentList = new ArrayList<Student>();
		filePath = Environment.getExternalStorageDirectory().getPath() + "/student.xml";
	}

	
	
	//点击事件
	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.main_bt_add:
			addStudent();
			break;
		case R.id.main_bt_save:
			if(studentList.size() > 0){
				if(saveStudentToLocal()){
					Toast.makeText(this, "保存成功", 0).show();
				} else {
					Toast.makeText(this, "保存失败", 0).show();
				}
			} else {
				Toast.makeText(this, "当前没数据", 0).show();
			}
			break;
		case R.id.main_bt_recover:
			if(restoreStudentFromLocal()){
				Toast.makeText(this, "恢复成功", 0).show();
			}else{
				Toast.makeText(this, "恢复失败", 0).show();
			}
		default:
			break;
		}
	}
	
	/**
	 * 添加学生方法
	 */
	private void addStudent(){
		//先获取用户输入的信息
		String name = et_name.getText().toString();
		String sex = et_sex.getText().toString();
		String  age = et_age.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);
			ll.addView(childView);
		}else{
			Toast.makeText(this, "请正确输入", 0).show();
		}
		
	}
	
	/**
	 * 保存数据到本地   
	 */
	private boolean saveStudentToLocal(){
		try {
			//获取xml序列化器
			XmlSerializer xs = Xml.newSerializer();
			//初始化  设置编码
			xs.setOutput(new FileOutputStream(filePath), "utf-8");

			//开始生成xml
			//生成头节点
			xs.startDocument("utf-8", true);
			//头标签
			xs.startTag(null, "info");
			
			for (Student stu : studentList) {
				xs.startTag(null, "student");
				
				xs.startTag(null, "name");
				xs.text(stu.getName());
				xs.endTag(null, "name");
				
				xs.startTag(null, "sex");
				xs.text(stu.getSex());
				xs.endTag(null, "sex");
				
				xs.startTag(null, "age");
				xs.text(String.valueOf(stu.getAge()));
				xs.endTag(null, "age");
				
				xs.endTag(null, "student");
			}
			
			//生成结束标签
			xs.endTag(null, "info");
			//结束标签
			xs.endDocument();
			return true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return false;
	}
	
	/**
	 * 
	 */
	
	/**
	 * 刷新重置学生列表
	 */
	private void refreshStudentList() {
		ll.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());
			ll.addView(childView);
		}
	}
	
	/**
	 * 解析xml  
	 */
	private boolean restoreStudentFromLocal(){
		try {
			//解析xml
			XmlPullParser xp = Xml.newPullParser();
			xp.setInput(new FileInputStream(filePath), "utf-8");
			
			int eventType = xp.getEventType();
			
			studentList.clear();
			
			Student student = null;
			String nodeName = null;
			while (eventType != XmlPullParser.END_DOCUMENT) {
				nodeName = xp.getName();
				switch (eventType) {
				case XmlPullParser.START_TAG:
					if("student".equals(nodeName)){
						student = new Student();
					}else if("name".equals(nodeName)){
						student.setName(xp.nextText());
					}else if("sex".equals(nodeName)){
						student.setSex(xp.nextText());
					}else if("age".equals(nodeName)){
						student.setAge(Integer.valueOf(xp.nextText()));
					}
					break;
				case XmlPullParser.END_TAG:
					if("student".equals(nodeName)){
						studentList.add(student);
					}
					break;
				default:
					break;
				}
				eventType = xp.next();
			}
			refreshStudentList();
			
			return true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return false;
	}
	
}

student.java 配置文件

package com.example.student.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 + "]";
	}
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
}

布局文件

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:textColor="@android:color/holo_blue_bright"
        android:text="学生管理系统"
        android:layout_gravity="center_horizontal"
         />
    <RelativeLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dip"
        android:layout_marginTop="5dip">
        
        <TextView 
            android:id="@+id/main_tv_name"
            android:textSize="18sp"
            android:textColor="@android:color/darker_gray"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dip"
            android:text="姓名"/>
        
        <TextView 
            android:id="@+id/main_tv_sex"
            android:textSize="18sp"
            android:textColor="@android:color/darker_gray"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dip"
            android:padding="5dip"
            android:layout_toRightOf="@+id/main_tv_name"
            android:text="性别"/>
        
        <TextView 
            android:id="@+id/main_tv_age"
            android:textSize="18sp"
            android:textColor="@android:color/darker_gray"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dip"
            android:padding="5dip"
            android:layout_toRightOf="@+id/main_tv_sex"
            android:text="年龄"/>
        
        <EditText 
            android:id="@+id/main_et_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:layout_alignLeft="@+id/main_tv_name"
            android:layout_alignRight="@+id/main_tv_name"
            android:layout_below="@+id/main_tv_name"/>
        
        <EditText 
            android:id="@+id/main_et_sex"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:layout_alignLeft="@+id/main_tv_sex"
            android:layout_alignRight="@+id/main_tv_sex"
            android:layout_below="@+id/main_tv_sex"/>
        
        <EditText 
            android:id="@+id/main_et_age"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:layout_alignLeft="@+id/main_tv_age"
            android:layout_alignRight="@+id/main_tv_age"
            android:layout_below="@+id/main_tv_age"/>
        
        <Button 
            android:id="@+id/main_bt_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="添加学生"
            android:layout_alignBottom="@+id/main_et_age"/>
        
    </RelativeLayout>
    
    <ScrollView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1">
        
	    <LinearLayout
	        android:id="@+id/main_ll"
	        android:layout_width="match_parent"
	        android:layout_height="match_parent"
	        android:layout_margin="1dip"
	        android:padding="5dip"
	        android:orientation="vertical">
	        
	    </LinearLayout>
	</ScrollView>
	
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="5dip">
        
        <Button 
            android:id="@+id/main_bt_save"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="保存数据"/>
        
        <Button 
            android:id="@+id/main_bt_recover"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="恢复数据"/>
    </LinearLayout>
	
</LinearLayout>

效果图