Android实现学生管理系统

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<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(); 
    } 
  } 
} 
								 
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