【黑马Android】(03)学生管理系统/动态刷新界面
16lz
2021-01-26
学生管理系统
<?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="17" /> <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" android:theme="@android:style/Theme.NoTitleBar" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application></manifest>
<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="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>
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;}@Overridepublic 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";}@Overridepublic 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();}}}
动态刷新界面
<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" tools:context=".MainActivity" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="添加" /> <ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:id="@+id/ll" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > </LinearLayout> </ScrollView></LinearLayout>
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.itheima28.refreshview" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.itheima28.refreshview.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>
package com.itheima28.refreshview;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends Activity {private LinearLayout llGroup;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);llGroup = (LinearLayout) findViewById(R.id.ll);}public void onClick(View view) {// 添加一个TextView向llGroup// 定义一个textview对象TextView tv = new TextView(this);tv.setText("张三 女 34");// 把textview对象添加到linearlayout中llGroup.addView(tv);}}
更多相关文章
- Android.Bundle savedInstanceState 的意义用法
- android添加购物车动画实现
- SharedPreferences 数据存储
- Android(安卓)WebView请求,保存cookie,判断登录状态
- android ant
- viewModel与recyclerView结合
- android判断当前手机是否是小米
- android后台打水印,并进行压缩
- Android开启Java8