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[操作系统]简单的学生管理系统


简单的学生管理系统

一,主要功能:

  1,添加学生信息;

  2,添加的学生信息显示在线型布局中;

  3,把学生信息保存在

  4,把保存在mxl中的学生信息取出来解析显示在界面;

二,主要知识点:

  1,layout_weight的使用;

  2,pull解析

  3,保存数据到sd卡;

  4,动态添加控件刷新界面;

三,界面原型如下图:

四,代码展示:

  1,界面

<LinearLayout ="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>

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  2,定义实体类,Student.java

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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  3,主界面activity,MainActivity.java

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.;  }  @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 {      = new FileInputStream(filePath), "utf-8");            int eventType = parser.getEventType();            studentList.clear();            Student student = null;      String nodeName = null;      while(eventType != = parser.getName();        switch (eventType) {        case 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 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 {      = 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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通过以上步骤基本实现功能,不过还有需要完善的地方,比如年龄校验等