• Android第四次作业

    一、团队成员信息

    1. 周泽加：学号：1600802138 班级：计算机164班 博客链接：https://www.cnblogs.com/ronzzj/
    2. 南加拉才让：学号：1600802093 班级：计算机163班 博客链接：https://www.cnblogs.com/nanjia/
    3. 李长栋：学号：1600802085 班级：计算机163班 博客链接：https://www.cnblogs.com/L0HEYNI/

    二、APK链接：https://raw.githubusercontent.com/ronzzj/Android-Named/master/MyApplication/app-debug.apk

    三、代码链接：https://github.com/ronzzj/Android-Named.git

    四、团队项目

    4.1 团队项目的总体效果截图

     

    4.2 实现的功能及其效果的描述

    功能：1.上课顺序点名功能

               2.上课 随机点名功能

               3.查询信息功能

               4.修改学生信息功能

               5.显示公告

    效果：能够从数据库中找出学生信息进行顺序、随机点名，并可以修改数据库中的学生信息。

    项目效果录屏：

    五、给出项目中的关键代码

    5.1 学生数据操作：

    package com.example.administrator.myapplication;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class addActivtiy extends AppCompatActivity
{
    static TextView info;
    static EditText mEditText01;
    static EditText mEditText02;
    static EditText mEditText03;
    static EditText mEditText04;
    Cursor cursor;
    Button exBtn;
    Button createBtn, openBtn, upBtn, downBtn;
    Button addBtn, updateBtn, deleteBtn;
    SQLiteDatabase db;
    DBConnection helper;
    public int id_this;
    Bundle savedInstanceState;
    static String TABLE_NAME = "Student";          
    static String ID = "_id";                    
    static String NAME = "name";                    
    static String NUMBER = "number";           
   static String ABSENT = "absent";            
    static String LATE = "late";            

    Toast toast;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add);
        mEditText01 = (EditText)findViewById(R.id.EditText01);
        mEditText02 = (EditText)findViewById(R.id.EditText02);
        mEditText03 = (EditText)findViewById(R.id.EditText03);
        mEditText04 = (EditText)findViewById(R.id.EditText04);
        upBtn=(Button)findViewById(R.id.up1);
        upBtn.setOnClickListener(new ClickEvent());
        downBtn=(Button)findViewById(R.id.down1);
        downBtn.setOnClickListener(new ClickEvent());
        addBtn = (Button)findViewById(R.id.add1);
        addBtn.setOnClickListener(new ClickEvent());
        updateBtn = (Button)findViewById(R.id.update1);
        updateBtn.setOnClickListener(new ClickEvent());
        deleteBtn = (Button)findViewById(R.id.delete1);
        deleteBtn.setOnClickListener(new ClickEvent());
        exBtn = (Button)findViewById(R.id.exBtn);
        exBtn.setOnClickListener(new ClickEvent());

        try {
            db = openOrCreateDatabase("Students.db",
                    Context.MODE_PRIVATE, null);
            cursor = db.query("Student",
                    null, null, null, null, null, null);
            if (cursor.getCount()>0) {
                cursor.moveToNext();
                datashow();
            }
            else {
                upBtn.setEnabled(false);
                downBtn.setEnabled(false);
                updateBtn.setEnabled(false);
                deleteBtn.setEnabled(false);
                info.setText("数据库为空，先添加学生信息");
            }
        }catch(Exception e){
            helper = new DBConnection(addActivtiy.this);
            SQLiteDatabase db = helper.getWritableDatabase();
//          createData();

        }
    }
    class ClickEvent implements OnClickListener
    {
        public void onClick(View v)
        {
            switch(v.getId())
            {

                case R.id.exBtn:
                    exAdd();
                    cursor = db.query("Student",
                            null, null, null, null, null, null);
                    cursor.moveToNext();
                    datashow();
                    break;
                case R.id.up1:
                    if(!cursor.isFirst())
                        cursor.moveToPrevious();
                    datashow();
                    break;
                case R.id.down1:
                    if(!cursor.isLast())
                        cursor.moveToNext();
                    datashow();
                    break; //
                case R.id.add1:
                    add();
                    cursor = db.query("Student",
                            null, null, null, null, null, null);
                    try{
                        if (cursor.getCount()>0){
                            cursor.moveToNext();
                            datashow();
                        }
                        else{
                            upBtn.setEnabled(false);
                            downBtn.setEnabled(false);
                            updateBtn.setEnabled(false);
                            deleteBtn.setEnabled(false);
                        }
                    }catch (Exception e){
                    }
                    break;
                case R.id.update1:
                    update();
                    cursor = db.query("Student",
                            null, null, null, null, null, null);
                    cursor.moveToNext();
                    datashow();
                    showToast("数据更新成功！");
                    break;
                case  R.id.delete1:
                    delete();
                    cursor = db.query("Student",
                            null, null, null, null, null, null);
                    try{
                        if (cursor.getCount()>0){
                            cursor.moveToNext();
                            datashow();
                        }
                        else{
                            mEditText01.setText("");
                            mEditText02.setText("");
                            upBtn.setEnabled(false);
                            downBtn.setEnabled(false);
                            updateBtn.setEnabled(false);
                            deleteBtn.setEnabled(false);
                            info.setText("数据库为空，请添加学生信息");
                        }
                    }catch (Exception e){
                    }
                    showToast("数据删除成功！");
                    break;
            }
        }
    }
    void datashow()
    {
        if (cursor.getCount()>0) {
            id_this = Integer.parseInt(cursor.getString(0));
            String name_this = cursor.getString(1);
            String number_this = cursor.getString(2);
            String absent_this = cursor.getString(3);
            String late_this = cursor.getString(4);
            mEditText01.setText(name_this);
            mEditText02.setText(number_this);
            mEditText03.setText(absent_this);
            mEditText04.setText(late_this);
        }
        else{
            upBtn.setEnabled(false);
            downBtn.setEnabled(false);
            updateBtn.setEnabled(false);
            deleteBtn.setEnabled(false);
            info.setText("数据库为空，先添加学生信息");
        }
    }
    void add()
    {
        if(mEditText01.getText().toString().length()>0&&mEditText02.getText().toString().length()>0){
            try{
                db = openOrCreateDatabase("Students.db",
                        Context.MODE_PRIVATE, null) ;
                ContentValues values1 = new ContentValues();
                values1.put(NAME, addActivtiy.mEditText01.getText().toString());
                values1.put(NUMBER, addActivtiy.mEditText02.getText().toString());
                values1.put(ABSENT, addActivtiy.mEditText03.getText().toString());
                values1.put(LATE, addActivtiy.mEditText04.getText().toString());
                db.insert(TABLE_NAME, null, values1);
                showToast("数据添加成功！");
                upBtn.setEnabled(true);
                downBtn.setEnabled(true);
                updateBtn.setEnabled(true);
                deleteBtn.setEnabled(true);
            }
            catch (Exception e){ }
        }
        else {showToast("名字或学号不能为空！"); }

    }
    void update()
    {
        try {
            ContentValues values = new ContentValues();
            values.put(NAME, addActivtiy.mEditText01.getText().toString());
            values.put(NUMBER, addActivtiy.mEditText02.getText().toString());
            values.put(ABSENT, addActivtiy.mEditText03.getText().toString());
            values.put(LATE, addActivtiy.mEditText04.getText().toString());
            String where1 = ID + " = " + id_this;
            db.update(TABLE_NAME, values, where1, null);
            db = helper.getWritableDatabase();
        }
        catch (Exception e){
        }
    }
    void delete()
    {
        try{
            String where = ID + " = " + id_this;
            db.delete(TABLE_NAME, where ,null);
            db = helper.getWritableDatabase();
        }
        catch (Exception e){
        }
    }

    void showToast(String str){
        toast = Toast.makeText(getApplicationContext(),str,Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.CENTER,0,0);
        toast.show();
    }
    void createData(){
        String TABLE_NAME = "Student";          
        String ID = "_id";                    
        String NAME = "name";                  
        String NUMBER = "number";          
        String ABSENT = "absent";           
        String LATE = "late";            

        SQLiteDatabase db;
        String db_name = "Students.db";
        String sqlStr = "CREATE TABLE " + TABLE_NAME + " ("
                + ID  + " INTEGER primary key autoincrement, "
                + NAME + " text not null, "
                + NUMBER + " text not null, "
                + ABSENT + " text not null, "
                + LATE + " text not null "+ ");";
        int mode = Context.MODE_PRIVATE;
        db = this.openOrCreateDatabase(db_name,mode,null);
        db.execSQL(sqlStr);
    }
 
}

    5.2 查询学生信息

    package com.example.administrator.myapplication;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DBConnection extends SQLiteOpenHelper
{
    static final String Database_name = "Students.db";
    static final int Database_Version = 1;
    SQLiteDatabase db;
    public int id_this;
    Cursor cursor;
    static String TABLE_NAME = "Student";          
    static String ID = "_id";                   
    static String NAME = "name";                    
    static String NUMBER = "number";           
    static String ABSENT = "absent";          
    static String LATE = "late";           

        DBConnection(Context ctx)
        {
        super(ctx, Database_name, null, Database_Version);
        }
        public void onCreate(SQLiteDatabase database)
        {
                String sql = "CREATE TABLE " + TABLE_NAME + " ("
                   + ID  + " INTEGER primary key autoincrement, "
                   + NAME + " text not null, "
                   + NUMBER + " text not null, "
                   + ABSENT + " text not null, "
                 + LATE + " text not null "+ ");";
        database.execSQL(sql);
        }
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
        {                 }
}

    5.3 MainActivity：

    package com.example.administrator.myapplication;

        import android.content.Intent;
        import android.os.Bundle;
        import android.support.v7.app.AppCompatActivity;
        import android.view.View;
        import android.widget.ImageButton;
        import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    ImageButton addBtn;
    ImageButton turnBtn;
    ImageButton ranBtn;
    ImageButton webBtn;
    ImageButton selectBtn;
    ImageButton outBtn;
    DBConnection helper;
    Toast toast;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        addBtn = (ImageButton)findViewById(R.id.addBtn);
        addBtn.setOnClickListener(new addClick());
        turnBtn = (ImageButton)findViewById(R.id.turnBtn);
        turnBtn.setOnClickListener(new turnClick());
        ranBtn = (ImageButton)findViewById(R.id.ranBtn);
        ranBtn.setOnClickListener(new ranClick());
        webBtn = (ImageButton)findViewById(R.id.noBtn);
        webBtn.setOnClickListener(new webClick());
        selectBtn = (ImageButton)findViewById(R.id.selectBtn);
        selectBtn.setOnClickListener(new selectClick());
        outBtn = (ImageButton)findViewById(R.id.outBtn);
        outBtn.setOnClickListener(new outClick());
    }
    class addClick implements View.OnClickListener{
        public void onClick(View v){
            Intent intent = new Intent(MainActivity.this, addActivtiy.class);
            startActivity(intent);
        }
    }
    class turnClick implements View.OnClickListener{
        public void onClick(View v){
            Intent intent = new Intent(MainActivity.this, turnActivity.class);
            startActivity(intent);
        }
    }
    class ranClick implements View.OnClickListener{
        public void onClick(View v){
            Intent intent = new Intent(MainActivity.this, randomActivity.class);
            startActivity(intent);
        }
    }
    class webClick implements View.OnClickListener{
        public void onClick(View v){
            Intent intent = new Intent(MainActivity.this,webActivity.class);
            startActivity(intent);
        }
    }
    class selectClick implements View.OnClickListener{
        public void onClick(View v){
            Intent intent = new Intent(MainActivity.this, selectActivity.class);
            startActivity(intent);
        }
    }
    class outClick implements View.OnClickListener{
        public void onClick(View v){
            System.exit(0);
        }
    }
}

    5.4  查询结果：

    package com.example.administrator.myapplication;

import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class numberActivity extends AppCompatActivity {

    static TextView TextView1;
    static TextView TextView2;
    static TextView TextView3;
    static TextView TextView4;
    TextView info;

    SQLiteDatabase db;
    Cursor cursor;
    DBConnection helper;
    public int id_this;
    Bundle savedInstanceState;
    static String TABLE_NAME = "Student";        
    static String ID = "_id";                  
    static String NAME = "name";                  
    static String NUMBER = "number";       
    static String ABSENT = "absent";        
    static String LATE = "late";       
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_number);
        TextView1 = (TextView)findViewById(R.id.TextView1);
        TextView2 = (TextView)findViewById(R.id.TextView2);
        TextView3 = (TextView)findViewById(R.id.TextView3);
        TextView4 = (TextView)findViewById(R.id.TextView4);
        info = (TextView)findViewById(R.id.info);

        Intent intent = getIntent();
        String number = intent.getStringExtra("number");

        db = openOrCreateDatabase("Students.db",
                Context.MODE_PRIVATE, null) ;
        cursor = db.query("Student",
                null , null, null, null, null, null);
        int flag = 0;
        while(!cursor.isLast()){
            cursor.moveToNext();
            String stuNumber = cursor.getString(2);
            if (stuNumber.equals(number)) {
                flag = 1;
                break;
            }
        }
        if(flag == 0) info.setText("没有找到学号为 "+number+" 的学生");
        datashow();
    }
    void datashow()
    {
        id_this = Integer.parseInt(cursor.getString(0));
        String name_this = cursor.getString(1);
        String number_this = cursor.getString(2);
        String absent_this = cursor.getString(3);
        String late_this = cursor.getString(4);
        TextView1.setText(name_this);
        TextView2.setText(number_this);
        TextView3.setText(absent_this);
        TextView4.setText(late_this);
    }
}

    5.5 添加数据库：

    package com.example.administrator.myapplication;

import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class random2Activity extends AppCompatActivity {

    Button absentBtn,lateBtn,skipBtn;
    TextView TextView1,TextView2,TextView3,TextView4,info;

    Cursor cursor;
    SQLiteDatabase db;
    DBConnection helper;
    public int id_this;
    Bundle savedInstanceState;
    static String TABLE_NAME = "Student";          
    static String ID = "_id";                  
    static String NAME = "name";                  
    static String NUMBER = "number";         
    static String ABSENT = "absent";         
    static String LATE = "late";      

    Toast toast;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_random2);
        TextView1=(TextView)findViewById(R.id.TextView1);
        TextView2=(TextView)findViewById(R.id.TextView2);
        TextView3=(TextView)findViewById(R.id.TextView3);
        TextView4=(TextView)findViewById(R.id.TextView4);
        info=(TextView)findViewById(R.id.info);
        absentBtn = (Button)findViewById(R.id.absentBtn);
        absentBtn.setOnClickListener(new mClick());
        lateBtn = (Button)findViewById(R.id.lateBtn);
        lateBtn.setOnClickListener(new mClick());
        skipBtn = (Button)findViewById(R.id.skipBtn);
        skipBtn.setOnClickListener(new mClick());
        try {
            db = openOrCreateDatabase("Students.db",
                    android.content.Context.MODE_PRIVATE, null);
            cursor = db.query("Student",
                    null, null, null, null, null, null);
            int i = (int) (Math.random() * cursor.getCount());
            cursor.moveToPosition(i);
            datashow();
        }catch (Exception e){
            absentBtn.setEnabled(false);
            lateBtn.setEnabled(false);
            skipBtn.setEnabled(false);
            showToast("数据库为空，请先添加学生信息！");
        }
    }
    class mClick implements View.OnClickListener {
        public void onClick(View v){
            switch(v.getId())
            {
                case R.id.absentBtn:{
                    absent();
                    Intent intent = new Intent(random2Activity.this,randomActivity.class);
                    startActivity(intent);
                    random2Activity.this.finish();
                    showToast("操作成功！");
                    break;
                }
                case R.id.lateBtn:{
                    late();
                    Intent intent = new Intent(random2Activity.this,randomActivity.class);
                    startActivity(intent);
                    random2Activity.this.finish();
                    showToast("操作成功！");
                    break;
                }
                case R.id.skipBtn:{
                    Intent intent = new Intent(random2Activity.this,randomActivity.class);
                    startActivity(intent);
                    random2Activity.this.finish();
                    showToast("操作成功！");
                    break; //
                }
            }
        }
    }
    void absent(){
        try {
            int absent =  Integer.parseInt(TextView3.getText().toString()) + 1;
            android.content.ContentValues values = new android.content.ContentValues();
            values.put(NAME, TextView1.getText().toString());
            values.put(NUMBER, TextView2.getText().toString());
            values.put(ABSENT, absent+"");
            values.put(LATE, TextView4.getText().toString());
            String where1 = ID + " = " + id_this;
            db.update(TABLE_NAME, values, where1, null);
            db = helper.getWritableDatabase();
            db.close();
        }
        catch (Exception e){}
    }
    void late(){
        try {
            int late =  Integer.parseInt(TextView4.getText().toString()) + 1;
            android.content.ContentValues values = new android.content.ContentValues();
            values.put(NAME, TextView1.getText().toString());
            values.put(NUMBER, TextView2.getText().toString());
            values.put(ABSENT, TextView3.getText().toString());
            values.put(LATE, late+"");
            String where1 = ID + " = " + id_this;
            db.update(TABLE_NAME, values, where1, null);
            db = helper.getWritableDatabase();
            db.close();
        }
        catch (Exception e){}
    }
    void datashow()
    {
        id_this = Integer.parseInt(cursor.getString(0));
        String name_this = cursor.getString(1);
        String number_this = cursor.getString(2);
        String absent_this = cursor.getString(3);
        String late_this = cursor.getString(4);
        TextView1.setText(name_this);
        TextView2.setText(number_this);
        TextView3.setText(absent_this);
        TextView4.setText(late_this);
    }
    void showToast(String str){
        toast = Toast.makeText(getApplicationContext(),str,Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.CENTER,0,0);
        toast.show();
    }
}
     

    六、心目中前五的的apk

     1.盖星辰组：该组做的是一个游戏app，实现的功能有1.小人左右移动。2、自动生成挡板3、检测失败条件。4、实现难度控制5、记录得分并实现排行榜。6、播放音乐。7、流畅播放小人下落的动画。我们全体小组都认为改组做的比较好。

    2.孟凡锚组：该组做的是一个音乐播放器app，实现的功能有在一开始的开始页面实现欢迎页面视频的播放，感觉效果和创意非常好，再还有海报的滑动播放功能也不错。最后认为比较好的是列表的展示，点击播放并改变颜色换等。

    3.沈顺文组：该组做的是一个游戏app，改组的登录注册都能实现，并且游戏体验感比较好。

    4.张琦组：该项目主要实现的信息的查询功能，查询一些课程的信息，而且也可以发布信息，界面比较简洁。

    5.李钊组：该组的首页顶部使用轮播图展示了一些球员的照片，下面紧接着的是当下的时事新闻，点击相应的新闻可以查看具体内容，比较简洁。第二页展示了最新的球员世界排名。第三页是部分球员的详细介绍。第四页列出了2019年乒乓球的赛事赛程。第五页是精彩集锦，点击可以查看相关的视频。

    七、团队成员做项目中遇到的问题，以及解决方法

    李长栋：1.在实现随机点名功能时会出现打开学生数据表时一直会报错的情况。

    2.可以添加空记录的异常错误。

    南加拉才让：1.删除最后一个数据时不可避免的异常

    2.无法添加数据库

    周泽加：1.运行程序时，出现闪退情况；R包丢失

    2.运行项目时出现错误：Information:Gradle tasks，

    八、说明团队成员在本次项目中的分工、占了总工作的多少？以及对项目成员打分

    姓名 分工 工作比例 分数
    李长栋 顺序点名模块 25% 10
    南加拉才让  随机点名模块 25% 10
    周泽加 查询信息模块 25% 10
    苏毅俊 修改学生信息模块 25% 10
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  • 原文地址：https://www.cnblogs.com/Suejun/p/10192755.html
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