安卓基础（综合小测）

我今天做了一个综合行的稍微复杂一点的app，将之前学到的知识都串一遍，更好的运用和记忆。

今天做的项目为：篮球计分器。

可以记A队,B队的等分情况，可以将比分全部清零，可以进行一次撤回操作，可以实现本地化（即英汉都可运行，不丢失数据），可以进行横屏操作。

 java/MainAcitivity：

package com.example.basketball;

import android.arch.lifecycle.Observer;
import android.arch.lifecycle.ViewModelProvider;
import android.arch.lifecycle.ViewModelProviders;
import android.databinding.DataBindingUtil;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import com.example.basketball.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
MyViewModel myViewModel;
ActivityMainBinding binding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       myViewModel = ViewModelProviders.of(this).get(MyViewModel.class);
       binding = DataBindingUtil.setContentView(this,R.layout.activity_main);
        myViewModel.getAnumber().observe(this, new Observer<Integer>() {
            @Override
            public void onChanged(@Nullable Integer integer) {
                binding.textView4.setText(String.valueOf(integer));
            }
        });
        myViewModel.getBnumber().observe(this, new Observer<Integer>() {
            @Override
            public void onChanged(@Nullable Integer integer) {
                binding.textView5.setText(String.valueOf(integer));
            }
        });
       binding.button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myViewModel.addone(0);
            }
        });
        binding.button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myViewModel.addone(1);
            }
        });
        binding.button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myViewModel.addtwo(0);
            }
        });
        binding.button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myViewModel.addtwo(1);
            }
        });
        binding.button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myViewModel.addthree(0);
            }
        });
        binding.button6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myViewModel.addthree(1);
            }
        });
    binding.imageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            myViewModel.refresh();
        }
    });
  binding.imageButton2.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          myViewModel.back();
      }
  });
    }
}

java/MyViewModel：

package com.example.basketball;

import android.arch.lifecycle.MutableLiveData;
import android.arch.lifecycle.ViewModel;
import android.widget.Button;

public class MyViewModel extends ViewModel {
    private MutableLiveData<Integer> Anumber;
    private MutableLiveData<Integer> Bnumber;
    private int aback,bback;

    public MutableLiveData<Integer> getAnumber() {
        if(Anumber==null){
            Anumber = new MutableLiveData<>();
            Anumber.setValue(0);
        }
        return Anumber;
    }
    public MutableLiveData<Integer> getBnumber() {
        if(Bnumber==null){
            Bnumber = new MutableLiveData<>();
            Bnumber.setValue(0);
        }
        return Bnumber;
    }
    public void addone(int n){
      if(n==0){
          aback = Anumber.getValue();
          bback = Bnumber.getValue();
        Anumber.setValue(Anumber.getValue() + 1);

      }else{
          aback = Anumber.getValue();
          bback = Bnumber.getValue();
          Bnumber.setValue(Bnumber.getValue() + 1);

      }

    }
    public void addtwo(int n){
        if(n==0){
            aback = Anumber.getValue();
            bback = Bnumber.getValue();
            Anumber.setValue(Anumber.getValue() + 2);

        }else{
            aback = Anumber.getValue();
            bback = Bnumber.getValue();
            Bnumber.setValue(Bnumber.getValue() + 2);

        }
    }
    public void addthree(int n){
        if(n==0){
            aback = Anumber.getValue();
            bback = Bnumber.getValue();
            Anumber.setValue(Anumber.getValue() + 3);

        }else{
            aback = Anumber.getValue();
            bback = Bnumber.getValue();
            Bnumber.setValue(Bnumber.getValue() + 3);

        }
    }
    public void refresh(){
        aback = Anumber.getValue();
        bback = Bnumber.getValue();
        Anumber.setValue(0);
        Bnumber.setValue(0);
    }
    public void back(){
        Anumber.setValue(aback);
        Bnumber.setValue(bback);

    }

}

竖屏界面代码：

<?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>

    </data>

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <android.support.constraint.Guideline
            android:id="@+id/guideline"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_begin="88dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_begin="206dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_begin="325dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="57dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="171dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="200dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="293dp" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline8"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="417dp" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/left"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline5"
            app:layout_constraintEnd_toStartOf="@+id/guideline2"
            app:layout_constraintHorizontal_bias="0.46"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.496" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/reight"
            android:textSize="24sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline5"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline2"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button1"
            android:background="#DB0F1A"
            app:layout_constraintBottom_toTopOf="@+id/guideline7"
            app:layout_constraintEnd_toStartOf="@+id/guideline2"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline6" />

        <android.support.constraint.Guideline
            android:id="@+id/guideline9"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintGuide_begin="497dp" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textview"
            android:textSize="30sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline6"
            app:layout_constraintEnd_toStartOf="@+id/guideline2"
            app:layout_constraintHorizontal_bias="0.535"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline4"
            app:layout_constraintVertical_bias="0.596" />

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/textview"
            android:text="@string/textview"
            android:textSize="30sp"
            app:layout_constraintBottom_toTopOf="@+id/guideline6"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline2"
            app:layout_constraintTop_toTopOf="@+id/guideline4"
            app:layout_constraintVertical_bias="0.596" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button1"
            android:background="#1429DB"
            app:layout_constraintBottom_toTopOf="@+id/guideline7"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline2"
            app:layout_constraintTop_toTopOf="@+id/guideline6" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button2"
            android:background="#DB0F1A"
            app:layout_constraintBottom_toTopOf="@+id/guideline8"
            app:layout_constraintEnd_toStartOf="@+id/guideline2"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline7" />

        <Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button2"
            android:background="#1429DB"
            app:layout_constraintBottom_toTopOf="@+id/guideline8"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/guideline2"
            app:layout_constraintTop_toTopOf="@+id/guideline7" />

        <Button
            android:id="@+id/button5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button3"
            android:background="#DB0F1A"
            app:layout_constraintBottom_toTopOf="@+id/guideline9"
            app:layout_constraintEnd_toStartOf="@+id/guideline2"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline8" />

        <Button
            android:id="@+id/button6"
            android:background="#1429DB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button3"
            app:layout_constraintBottom_toTopOf="@+id/guideline9"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.504"
            app:layout_constraintStart_toStartOf="@+id/guideline2"
            app:layout_constraintTop_toTopOf="@+id/guideline8"
            app:layout_constraintVertical_bias="0.492" />

        <ImageButton
            android:id="@+id/imageButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/refresh"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.166"
            app:layout_constraintStart_toStartOf="@+id/guideline2"
            app:layout_constraintTop_toTopOf="@+id/guideline9"
            app:layout_constraintVertical_bias="0.12"
            app:srcCompat="@drawable/ic_refresh_black_24dp" />

        <ImageButton
            android:id="@+id/imageButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/back"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/guideline2"
            app:layout_constraintHorizontal_bias="0.886"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/guideline9"
            app:layout_constraintVertical_bias="0.111"
            app:srcCompat="@drawable/ic_undo_black_24dp" />
    </android.support.constraint.ConstraintLayout>
</layout>

横屏界面代码：

<?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>

    </data>

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/left"
            android:textSize="24sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.251"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.084" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/reight"
            android:textSize="24sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.753"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.084" />

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#DB0F1A"
            android:text="@string/button1"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.074"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.468" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/textview"
            android:textSize="30sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.262"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.256" />

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/textview"
            android:text="@string/textview"
            android:textSize="30sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.76"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.256" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#1429DB"
            android:text="@string/button1"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.631"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.468" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#DB0F1A"
            android:text="@string/button2"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.371"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.468" />

        <Button
            android:id="@+id/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#1429DB"
            android:text="@string/button2"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.933"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.468" />

        <ImageButton
            android:id="@+id/imageButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/refresh"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.615"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.672"
            app:srcCompat="@drawable/ic_refresh_black_24dp" />

        <ImageButton
            android:id="@+id/imageButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/back"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.408"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.679"
            app:srcCompat="@drawable/ic_undo_black_24dp" />

        <Button
            android:id="@+id/button5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#DB0F1A"
            android:text="@string/button3"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.074"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.688" />

        <Button
            android:id="@+id/button6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button3"
            android:background="#1429DB"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.948"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.688" />
    </android.support.constraint.ConstraintLayout>

</layout>

values/英文strings:

<resources>
    <string name="app_name">Basketball</string>
    <string name="textview">hello</string>
    <string name="button1">+1</string>
    <string name="button2">+2</string>
    <string name="button3">+3</string>
    <string name="left">Team A</string>
    <string name="reight">Team B</string>
    <string name="refresh">refresh</string>
    <string name="back">back</string>
</resources>

中文strings：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">篮球记分器</string>
    <string name="textview">你好</string>
    <string name="button1">+1</string>
    <string name="button2">+2</string>
    <string name="button3">+3</string>
    <string name="left">A队</string>
    <string name="reight">B队</string>
</resources>