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

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 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(); 
  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。