【Android】综合练习：篮球比赛计分器

Author：寒光博客
发布时间：March 21, 2020
762 views
One comment
13868 字数
Categories：学习笔记 Android

Demo

根据如图设计界面

涉及点：
View Model
Live Data
Data Binding
Screen Orientation
Localization VectorDrawable

代码

支持中英双语，转屏，后台暂存
通过stack来恢复上一步操作

MyViewModel.java

package cn.dxoca.basketballscoring;

import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

import java.util.Stack;

public class MyViewModel extends ViewModel {
    private MutableLiveData<Integer> score_a, score_b;
    Stack<Integer> stackAB[] = new Stack[2];

    public MutableLiveData<Integer> getScore_a() {
        if (score_a == null) {
            score_a = new MutableLiveData<>();
            stackAB[0] = new Stack<>();
            score_a.setValue(0);
        }
        return score_a;
    }

    public MutableLiveData<Integer> getScore_b() {
        if (score_b == null) {
            score_b = new MutableLiveData<>();
            stackAB[1] = new Stack<>();
            score_b.setValue(0);
        }
        return score_b;
    }

    /**
     * 清空数据 初始化
     */
    public void init() {
        recordStackAB();
        score_a.setValue(0);
        score_b.setValue(0);
    }

    public void add_a(int n) {
        recordStackAB();
        score_a.setValue(score_a.getValue() + n);
    }

    public void add_b(int n) {
        recordStackAB();
        score_b.setValue(score_b.getValue() + n);
    }
    /**
     * 恢复上一步的数据
     * 用旧的分数覆盖新的分数
     */
    public void recover() {
        if (!stackAB[0].isEmpty()) {//因为ab同入同出 只要判断一个就好了
            score_a.setValue(stackAB[0].pop());
            score_b.setValue(stackAB[1].pop());
        }
    }

    public void recordStackAB() {
        stackAB[0].push(score_a.getValue());
        stackAB[1].push(score_b.getValue());
    }
}

MainActivity.java

package cn.dxoca.basketballscoring;

import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.ViewModelProvider;

import android.os.Bundle;

import cn.dxoca.basketballscoring.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
    MyViewModel myViewModel;//管理数据
    ActivityMainBinding binding;//管理对象

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);//创建这个对象的绑定 xml的标签都会成为这个类的成员
        myViewModel = new ViewModelProvider(this).get(MyViewModel.class);
        binding.setData(myViewModel);//设置数据
        binding.setLifecycleOwner(this);//设置监听
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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">
    <data>
        <variable
            name="data"
            type="cn.dxoca.basketballscoring.MyViewModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <ImageButton
            android:id="@+id/imageButton_Initialize"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginStart="52dp"
            android:background="@android:color/darker_gray"
            android:contentDescription="@string/imageDescription"
            android:onClick="@{()->data.init()}"
            app:layout_constraintBottom_toTopOf="@+id/guideline8"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline7"
            app:srcCompat="@drawable/ic_autorenew_black_24dp" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.82" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline8"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.91" />

        <Button
            android:id="@+id/button_A2"
            android:onClick="@{()->data.add_a(2)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="@android:color/holo_red_light"
            android:text="@string/button_add_2"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline6"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline5" />

        <Button
            android:id="@+id/button_B2"
            android:onClick="@{()->data.add_b(2)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="#009952"
            android:text="@string/button_add_2"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline6"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline5" />

        <Button
            android:id="@+id/button_A3"
            android:onClick="@{()->data.add_a(3)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="@android:color/holo_red_light"
            android:text="@string/button_add_3"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline7"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline6" />

        <Button
            android:id="@+id/button_B3"
            android:onClick="@{()->data.add_b(3)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="#009952"
            android:text="@string/button_add_3"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline7"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline6" />

        <Button
            android:id="@+id/button_B1"
            android:onClick="@{()->data.add_b(1)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="#009952"
            android:text="@string/button_add_1"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline5"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline4" />

        <TextView
            android:id="@+id/textView_B"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textView_B"
            android:textSize="18sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline3"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline9" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_percent="0.50121653" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.16" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline9"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.09" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.37" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.52" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.67" />

        <TextView
            android:id="@+id/textView_A"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textView_A"
            android:textSize="18sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline3"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline9" />

        <TextView
            android:id="@+id/textView_AScore"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{String.valueOf(data.score_a)}"
            android:textColor="@android:color/holo_red_light"
            android:textSize="60sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline4"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline3"
            tools:text="50" />

        <TextView
            android:id="@+id/textView_BScore"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{String.valueOf(data.score_b)}"
            android:textColor="#0D7A18"
            android:textSize="60sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline4"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline3"
            tools:text="120" />

        <Button
            android:id="@+id/button_A1"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="@android:color/holo_red_light"
            android:onClick="@{()->data.add_a(1)}"
            android:text="@string/button_add_1"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline5"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline4" />

        <ImageButton
            android:id="@+id/imageButton_Recover"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginEnd="52dp"
            android:background="@android:color/darker_gray"
            android:contentDescription="@string/imageDescription"
            android:onClick="@{()->data.recover()}"
            app:layout_constraintBottom_toTopOf="@+id/guideline8"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline7"
            app:layout_constraintVertical_bias="0.451"
            app:srcCompat="@drawable/ic_replay_black_24dp" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/author"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

正文到此结束

本文作者：寒光博客文章标题：【Android】综合练习：篮球比赛计分器
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Last modification：March 21st, 2020 at 08:04 pm

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One comment

程志辉 Google Chrome 73.0.3683.86 Windows 10 中国中国
March 22nd, 2020 at 12:24 pm

赞！坚持学习下去！！！

Reply

【Android】综合练习：篮球比赛计分器

寒光博客 • 2020 年 03 月 21 日

Demo

根据如图设计界面

涉及点：
View Model
Live Data
Data Binding
Screen Orientation
Localization VectorDrawable

代码

支持中英双语，转屏，后台暂存
通过stack来恢复上一步操作

MyViewModel.java

package cn.dxoca.basketballscoring;

import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

import java.util.Stack;

public class MyViewModel extends ViewModel {
    private MutableLiveData<Integer> score_a, score_b;
    Stack<Integer> stackAB[] = new Stack[2];

    public MutableLiveData<Integer> getScore_a() {
        if (score_a == null) {
            score_a = new MutableLiveData<>();
            stackAB[0] = new Stack<>();
            score_a.setValue(0);
        }
        return score_a;
    }

    public MutableLiveData<Integer> getScore_b() {
        if (score_b == null) {
            score_b = new MutableLiveData<>();
            stackAB[1] = new Stack<>();
            score_b.setValue(0);
        }
        return score_b;
    }

    /**
     * 清空数据 初始化
     */
    public void init() {
        recordStackAB();
        score_a.setValue(0);
        score_b.setValue(0);
    }

    public void add_a(int n) {
        recordStackAB();
        score_a.setValue(score_a.getValue() + n);
    }

    public void add_b(int n) {
        recordStackAB();
        score_b.setValue(score_b.getValue() + n);
    }
    /**
     * 恢复上一步的数据
     * 用旧的分数覆盖新的分数
     */
    public void recover() {
        if (!stackAB[0].isEmpty()) {//因为ab同入同出 只要判断一个就好了
            score_a.setValue(stackAB[0].pop());
            score_b.setValue(stackAB[1].pop());
        }
    }

    public void recordStackAB() {
        stackAB[0].push(score_a.getValue());
        stackAB[1].push(score_b.getValue());
    }
}

MainActivity.java

package cn.dxoca.basketballscoring;

import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.ViewModelProvider;

import android.os.Bundle;

import cn.dxoca.basketballscoring.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
    MyViewModel myViewModel;//管理数据
    ActivityMainBinding binding;//管理对象

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);//创建这个对象的绑定 xml的标签都会成为这个类的成员
        myViewModel = new ViewModelProvider(this).get(MyViewModel.class);
        binding.setData(myViewModel);//设置数据
        binding.setLifecycleOwner(this);//设置监听
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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">
    <data>
        <variable
            name="data"
            type="cn.dxoca.basketballscoring.MyViewModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <ImageButton
            android:id="@+id/imageButton_Initialize"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginStart="52dp"
            android:background="@android:color/darker_gray"
            android:contentDescription="@string/imageDescription"
            android:onClick="@{()->data.init()}"
            app:layout_constraintBottom_toTopOf="@+id/guideline8"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline7"
            app:srcCompat="@drawable/ic_autorenew_black_24dp" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.82" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline8"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.91" />

        <Button
            android:id="@+id/button_A2"
            android:onClick="@{()->data.add_a(2)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="@android:color/holo_red_light"
            android:text="@string/button_add_2"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline6"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline5" />

        <Button
            android:id="@+id/button_B2"
            android:onClick="@{()->data.add_b(2)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="#009952"
            android:text="@string/button_add_2"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline6"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline5" />

        <Button
            android:id="@+id/button_A3"
            android:onClick="@{()->data.add_a(3)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="@android:color/holo_red_light"
            android:text="@string/button_add_3"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline7"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline6" />

        <Button
            android:id="@+id/button_B3"
            android:onClick="@{()->data.add_b(3)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="#009952"
            android:text="@string/button_add_3"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline7"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline6" />

        <Button
            android:id="@+id/button_B1"
            android:onClick="@{()->data.add_b(1)}"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="#009952"
            android:text="@string/button_add_1"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline5"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline4" />

        <TextView
            android:id="@+id/textView_B"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textView_B"
            android:textSize="18sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline3"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline9" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_percent="0.50121653" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.16" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline9"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.09" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.37" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.52" />

        <androidx.constraintlayout.widget.Guideline
            android:id="@+id/guideline6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_percent="0.67" />

        <TextView
            android:id="@+id/textView_A"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textView_A"
            android:textSize="18sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline3"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline9" />

        <TextView
            android:id="@+id/textView_AScore"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{String.valueOf(data.score_a)}"
            android:textColor="@android:color/holo_red_light"
            android:textSize="60sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline4"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline3"
            tools:text="50" />

        <TextView
            android:id="@+id/textView_BScore"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{String.valueOf(data.score_b)}"
            android:textColor="#0D7A18"
            android:textSize="60sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline4"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline3"
            tools:text="120" />

        <Button
            android:id="@+id/button_A1"
            android:layout_width="133dp"
            android:layout_height="49dp"
            android:background="@android:color/holo_red_light"
            android:onClick="@{()->data.add_a(1)}"
            android:text="@string/button_add_1"
            android:textColor="@android:color/background_light"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline5"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline4" />

        <ImageButton
            android:id="@+id/imageButton_Recover"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginEnd="52dp"
            android:background="@android:color/darker_gray"
            android:contentDescription="@string/imageDescription"
            android:onClick="@{()->data.recover()}"
            app:layout_constraintBottom_toTopOf="@+id/guideline8"
            app:layout_constraintEnd_toStartOf="@+id/guideline"
            app:layout_constraintTop_toTopOf="@+id/guideline7"
            app:layout_constraintVertical_bias="0.451"
            app:srcCompat="@drawable/ic_replay_black_24dp" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/author"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

【Android】综合练习：篮球比赛计分器

Demo

代码

MyViewModel.java

MainActivity.java

activity_main.xml

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【Android】综合练习：篮球比赛计分器

Demo

代码

MyViewModel.java

MainActivity.java

activity_main.xml