排球比赛计分系统——任务实现及源代码

1.比赛计分器界面设计

 

源代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".main.MainActivity"
    android:orientation="vertical"
    android:gravity="center_horizontal">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center_horizontal"
        android:paddingTop="50dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Left:"/>

        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:id="@+id/leftScore"
            android:text="0"
            android:gravity="center"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=":" />

        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:id="@+id/rightScore"
            android:text="0"
            android:gravity="center"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Right:"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingTop="50dp">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+"
            android:id="@+id/leftBtn"/>

        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:id="@+id/left"
            android:text="0"
            android:gravity="center"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=":" />

        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:id="@+id/right"
            android:text="0"
            android:gravity="center"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+"
            android:id="@+id/rightBtn"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="bottom"
        android:layout_weight="1">

        <Button
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:text="1"
            android:id="@+id/one"/>

        <Button
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="2"
            android:id="@+id/two"/>

        <Button
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="3"
            android:id="@+id/three"/>

        <Button
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="4"
            android:id="@+id/four"/>

        <Button
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="5"
            android:id="@+id/five"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:id="@+id/clear"
            android:text="clear"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="查询比分："
            android:layout_marginLeft="10dp"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/showView"
            android:text="none" />

    </LinearLayout>

</LinearLayout>

2.比赛现场计分

 

源码

package com.example.gengen.domain;
public class Game {
    private int round;
    private String result;

    public int getRound() {
        return round;
    }

    public void setRound(int round) {
        this.round = round;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }

    @Override
    public String toString() {
        return "Game{" +
                "round=" + round +
                ", result='" + result + '\'' +
                '}';
    }
}

package com.example.gengen.main;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.example.gengen.R;
import com.example.gengen.db.DbDao;
import com.example.gengen.domain.Game;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private DbDao dbDao;
    private TextView left, leftScore, right, rightScore, showView;
    private Button leftBtn, rightBtn, one, two, three, four, five, clear;
    private int innings, numLeft, numRight, round, scoreL, scoreR;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();
        initView();
        initValues();
    }

    // 链接数据库
    private void init() {
        dbDao = new DbDao(getApplicationContext());
    }

    // 初始化变量
    private void initValues() {
        numLeft=0;
        numRight=0;
        scoreL=0;
        scoreR=0;
        round=1;
    }

    // 初始化控件
    private void initView() {
        left = findViewById(R.id.left);
        leftScore = findViewById(R.id.leftScore);
        right = findViewById(R.id.right);
        rightScore = findViewById(R.id.rightScore);
        showView = findViewById(R.id.showView);

        leftBtn = findViewById(R.id.leftBtn);
        rightBtn = findViewById(R.id.rightBtn);
        one = findViewById(R.id.one);
        two = findViewById(R.id.two);
        three = findViewById(R.id.three);
        four = findViewById(R.id.four);
        five = findViewById(R.id.five);
        clear = findViewById(R.id.clear);

        // 绑定单击事件
        leftBtn.setOnClickListener(this);
        rightBtn.setOnClickListener(this);
        one.setOnClickListener(this);
        two.setOnClickListener(this);
        three.setOnClickListener(this);
        four.setOnClickListener(this);
        five.setOnClickListener(this);
        clear.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.leftBtn:
                leftAdd();
                break;
            case R.id.rightBtn:
                rightAdd();
                break;
            case R.id.one:
                innings = 1;
                showView.setText(getInnings(innings));
                break;
            case R.id.two:
                innings = 2;
                showView.setText(getInnings(innings));
                break;
            case R.id.three:
                innings = 3;
                showView.setText(getInnings(innings));
                break;
            case R.id.four:
                innings = 4;
                showView.setText(getInnings(innings));
                break;
            case R.id.five:
                innings = 5;
                showView.setText(getInnings(innings));
                break;
            case R.id.clear:
                clearView();
                break;
        }
    }

    private void leftAdd() {
        numLeft++;
        left.setText(""+numLeft);
        isWin(numLeft, numRight);
        getWinner();
    }

    private void rightAdd() {
        numRight++;
        right.setText(""+numRight);
        isWin(numLeft, numRight);
        getWinner();
    }

    private void clearView() {
        left.setText("0");
        right.setText("0");
        leftScore.setText("0");
        rightScore.setText("0");
        showView.setText("none");
        numLeft=0;
        numRight=0;
        dbDao.delete();
    }

    private void clearScore() {
        left.setText("0");
        right.setText("0");
        numLeft=0;
        numRight=0;
    }

    // 获得具体对局
    private String getInnings(int innings) {
        String result = dbDao.findRound(innings);

        return result;
    }

    // 判断对局是否胜利
    public String isWin(int scoreLeft, int scoreRight) {

        int difference = scoreLeft - scoreRight;
        if(round <= 4) {
            if(scoreLeft >= 25 & difference >= 2) {
                scoreL++;
                leftScore.setText(""+scoreL);
                Log.d("test", "isWin: ");
                dbDao.insert(round, scoreLeft +":"+ scoreRight);
                clearScore();
                round++;
            }else if(scoreRight >= 25 & difference <= -2) {
                scoreR++;
                rightScore.setText(""+scoreR);
                dbDao.insert(round, scoreLeft +":"+ scoreRight);
                clearScore();
                round++;
            }
        }else {
            if(scoreLeft >= 15 & difference >= 2) {
                scoreL++;
                leftScore.setText(""+scoreL);
                dbDao.insert(round, scoreLeft +":"+ scoreRight);
                clearScore();
                round=1;
            }else if(scoreRight >= 15 & difference <= -2) {
                scoreR++;
                rightScore.setText(""+scoreR);
                dbDao.insert(round, scoreLeft +":"+ scoreRight);
                clearScore();
                round=1;
            }
        }

        return scoreLeft +":"+ scoreRight;
    }

    // 判断比赛输赢
    private void getWinner() {
        int l = Integer.parseInt(leftScore.getText().toString());
        int r = Integer.parseInt(rightScore.getText().toString());
        int difference = l-r;
        if(difference == 2 | l == 3) {
            Toast.makeText(this, "left win", Toast.LENGTH_LONG).show();
        }else if(difference == -2 | r == 3) {
            Toast.makeText(this, "right win", Toast.LENGTH_LONG).show();
        }
    }

}

3.比赛计分存入数据库

源码

package com.example.gengen.db;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.example.gengen.domain.Game;
import java.util.ArrayList;
import java.util.List;
public class DbDao {
    private DbHelper dbHelper;
    private SQLiteDatabase db;
    private List<Game> list = new ArrayList<>();
    public DbDao(Context context) {
        dbHelper = new DbHelper(context);
    }

    public String findRound(int round) {
        String result = null;
        db = dbHelper.getReadableDatabase();
        String sql = "select result from ball where round = '"+round+"'";
        Cursor c = db.rawQuery(sql, null);
        while (c.moveToNext()) {
            result = c.getString(c.getColumnIndex("result"));
        }
        c.close();
        db.close();
        return result;
    }

    public void insert(int round, String result) {
        db = dbHelper.getReadableDatabase();
        ContentValues values = new ContentValues();
        values.put("round", round);
        values.put("result", result);
        db.insert("ball", null, values);
        db.close();
    }

    public void delete() {
        db = dbHelper.getReadableDatabase();
        String sql = "delete from ball";
        db.execSQL(sql);
        db.close();
    }
}

package com.example.gengen.db;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;
public class DbHelper extends SQLiteOpenHelper {
    public DbHelper(Context context) {
        super(context, "dbTest.db", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createSql = "create table ball(" +
                "round int primary key, " +
                "result varchar(50))";
        db.execSQL(createSql);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String sql = "drop table if exists ball";
        db.execSQL(sql);
    }
}