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【Android】综合练习：篮球比赛计分器
Demo 根据如图设计界面 涉及点： View Model Live Data Data Binding Sc...
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2020/03

【Android】综合练习：篮球比赛计分器

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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>
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Last modification：March 21st, 2020 at 08:04 pm
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  1. 程志辉 Google Chrome 73.0.3683.86 Windows 10 中国 中国

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