使用ModelView,DataBinding,LiveData开发计分板APP
致自己的Android自学开发笔记！点击获取源码
功能
- 计分（+1、+2、+3）
- 撤销
- 重置
- 本地化
- 横竖版页面布局
1.build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.scoreboard"
minSdkVersion 19
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
android.defaultConfig.vectorDrawables.useSupportLibrary = true
dataBinding {
enabled true
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
}
2.MyViewModel.java
package com.example.scoreboard;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
public class MyViewModel extends ViewModel {
private MutableLiveData<Integer> teamA,teamB;
private Integer scoreA,scoreB;
public MutableLiveData<Integer> getTeamA() {
if (teamA==null) {
teamA = new MutableLiveData<>();
teamA.setValue(0);
}
return teamA;
}
public MutableLiveData<Integer> getTeamB() {
if (teamB==null) {
teamB = new MutableLiveData<>();
teamB.setValue(0);
}
return teamB;
}
public void addAScore(Integer s) {
scoreA = teamA.getValue();
scoreB = teamB.getValue();
teamA.setValue(teamA.getValue()+s);
}
public void addBScore(Integer s) {
scoreA = teamA.getValue();
scoreB = teamB.getValue();
teamB.setValue(teamB.getValue()+s);
}
public void resetScore() {
scoreA = teamA.getValue();
scoreB = teamB.getValue();
teamA.setValue(0);
teamB.setValue(0);
}
public void undo() {
teamA.setValue(scoreA);
teamB.setValue(scoreB);
}
}
3.layout_activity.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="com.example.scoreboard.MyViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.05" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.15" />
<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="0.3" />
<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="0.45" />
<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="0.75" />
<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="0.9" />
<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="0.6" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.5" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.1" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.9" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@string/tv_TeamA"
android:textColor="@android:color/holo_orange_dark"
android:textSize="@dimen/teamSize"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@string/tv_TeamB"
android:textColor="@android:color/holo_orange_dark"
android:textSize="@dimen/teamSize"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@{String.valueOf(data.getTeamA())}"
android:textColor="@android:color/holo_red_dark"
android:textSize="@dimen/scoreSize"
app:layout_constraintBottom_toTopOf="@+id/guideline5"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline2"
tools:text="159" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@{String.valueOf(data.getTeamB())}"
android:textColor="@android:color/holo_blue_dark"
android:textSize="@dimen/scoreSize"
app:layout_constraintBottom_toTopOf="@+id/guideline5"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline2"
tools:text="75" />
<Button
android:id="@+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_red_dark"
android:onClick="@{()->data.addAScore(1)}"
android:text="@string/btn_addone"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline6"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline5" />
<Button
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_blue_dark"
android:onClick="@{()->data.addBScore(1)}"
android:text="@string/btn_addone"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline6"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline5" />
<Button
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_red_dark"
android:onClick="@{()->data.addAScore(2)}"
android:text="@string/btn_addtwo"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline8"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<Button
android:id="@+id/button4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_blue_dark"
android:onClick="@{()->data.addBScore(2)}"
android:text="@string/btn_addtwo"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline8"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<Button
android:id="@+id/button5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_red_dark"
android:onClick="@{()->data.addAScore(3)}"
android:text="@string/btn_addthree"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline7"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline8" />
<Button
android:id="@+id/button6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_blue_dark"
android:onClick="@{()->data.addBScore(3)}"
android:text="@string/btn_addthree"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline7"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline8" />
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:contentDescription="@string/iv_undo"
android:onClick="@{()->data.undo()}"
app:layout_constraintBottom_toTopOf="@+id/guideline9"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintHorizontal_bias="0.8"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline7"
app:srcCompat="@drawable/ic_undo_black_24dp" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:contentDescription="@string/iv_reset"
android:onClick="@{()->data.resetScore()}"
app:layout_constraintBottom_toTopOf="@+id/guideline9"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintHorizontal_bias="0.2"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline7"
app:srcCompat="@drawable/ic_refresh_black_24dp" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="@string/tv_version"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline9"
app:layout_constraintVertical_bias="0.73" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
4.layout_activity.xml(Land)
<?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="com.example.scoreboard.MyViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.03" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.13" />
<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="0.27" />
<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="0.47" />
<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="0.87" />
<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="0.94" />
<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="0.67" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.5" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.1" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.9" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@string/tv_TeamA"
android:textColor="@android:color/holo_orange_dark"
android:textSize="@dimen/teamSize"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@string/tv_TeamB"
android:textColor="@android:color/holo_orange_dark"
android:textSize="@dimen/teamSize"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@{String.valueOf(data.getTeamA())}"
android:textColor="@android:color/holo_red_dark"
android:textSize="@dimen/scoreSizeLand"
app:layout_constraintBottom_toTopOf="@+id/guideline5"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline2"
tools:text="159" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="@{String.valueOf(data.getTeamB())}"
android:textColor="@android:color/holo_blue_dark"
android:textSize="@dimen/scoreSizeLand"
app:layout_constraintBottom_toTopOf="@+id/guideline5"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline2"
tools:text="75" />
<Button
android:id="@+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_red_dark"
android:onClick="@{()->data.addAScore(1)}"
android:text="@string/btn_addone"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline6"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline5" />
<Button
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_blue_dark"
android:onClick="@{()->data.addBScore(1)}"
android:text="@string/btn_addone"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline6"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline5" />
<Button
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_red_dark"
android:onClick="@{()->data.addAScore(2)}"
android:text="@string/btn_addtwo"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline8"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<Button
android:id="@+id/button4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_blue_dark"
android:onClick="@{()->data.addBScore(2)}"
android:text="@string/btn_addtwo"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline8"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<Button
android:id="@+id/button5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_red_dark"
android:onClick="@{()->data.addAScore(3)}"
android:text="@string/btn_addthree"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline7"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline8" />
<Button
android:id="@+id/button6"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="16dp"
android:background="@android:color/holo_blue_dark"
android:onClick="@{()->data.addBScore(3)}"
android:text="@string/btn_addthree"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/guideline7"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline8" />
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:contentDescription="@string/iv_undo"
android:onClick="@{()->data.undo()}"
app:layout_constraintBottom_toTopOf="@+id/guideline9"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintHorizontal_bias="0.8"
app:layout_constraintStart_toStartOf="@+id/guideline10"
app:layout_constraintTop_toTopOf="@+id/guideline7"
app:srcCompat="@drawable/ic_undo_black_24dp" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:contentDescription="@string/iv_reset"
android:onClick="@{()->data.resetScore()}"
app:layout_constraintBottom_toTopOf="@+id/guideline9"
app:layout_constraintEnd_toStartOf="@+id/guideline11"
app:layout_constraintHorizontal_bias="0.2"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toTopOf="@+id/guideline7"
app:srcCompat="@drawable/ic_refresh_black_24dp" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:text="@string/tv_version"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline9"
app:layout_constraintVertical_bias="0.73" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
5.MainActivity.java
package com.example.scoreboard;
import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.ViewModelProviders;
import android.os.Bundle;
import com.example.scoreboard.databinding.ActivityMainBinding;
public class MainActivity extends AppCompatActivity {
MyViewModel myViewModel;
ActivityMainBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
myViewModel = ViewModelProviders.of(this).get(MyViewModel.class);
binding.setData(myViewModel);
binding.setLifecycleOwner(this);
}
}
6.strings.xml
<resources>
<string name="app_name">ScoreBoard</string>
<string name="tv_TeamA">Team A</string>
<string name="tv_TeamB">Team B</string>
<string name="tv_TeamAScore">TeamAScore</string>
<string name="tv_TeamBScore">TeamBScore</string>
<string name="btn_addone" translatable="false">+1</string>
<string name="btn_addtwo" translatable="false">+2</string>
<string name="btn_addthree" translatable="false">+3</string>
<string name="iv_undo">undo</string>
<string name="iv_reset">reset</string>
<string name="tv_version" translatable="false">1.0 beta</string>
</resources>
7.strings.xml(zh-rCN)
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">计分板</string>
<string name="iv_reset">重置</string>
<string name="iv_undo">撤销</string>
<string name="tv_TeamA">A 队</string>
<string name="tv_TeamAScore">A 队分数</string>
<string name="tv_TeamB">B 队</string>
<string name="tv_TeamBScore">B 队分数</string>
</resources>
8.dimens.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<dimen name="teamSize">30sp</dimen>
<dimen name="scoreSize">60sp</dimen>
<dimen name="scoreSizeLand">40sp</dimen>
</resources>
9.效果图
