安卓学习---复习巩固

    本次主要针对以前学习的内容进行复习巩固,虽然也学习安卓两个月了,但 是感觉对于一些控件和布局的使用依然不是那么熟练,这一次主要是通过一个选餐的Demo进行复习巩固

内容

首先是布局文件:

?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="wrap_content"
    android:orientation="vertical"
    tools:context=".MainActivity">

<!--在顶部正中间设置一标题-->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#B9B9FF"
        android:text="开始选餐"
        android:textSize="30sp"
        android:textAlignment="center"
        android:textColor="#8A2BE2"
        android:textStyle="bold|italic"
        android:typeface="monospace"
        android:layout_marginBottom="10dp"
        />

<!--最外层的布局为了将整个屏幕的区域平分为两个部分-->
<LinearLayout
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="0dp"
        android:layout_weight="1">

        <LinearLayout
            android:layout_marginLeft="15dp"
            android:layout_width="match_parent"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:layout_height="45dp">

<!--输入姓名-->
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="姓名"
                android:textSize="22sp"/>
            <EditText
                android:id="@+id/nameEditText"
                android:layout_width="200dp"
                android:layout_height="wrap_content"
                android:hint="请输入姓名" />
        </LinearLayout>

<!--设置性别勾选框-->
        <LinearLayout
            android:layout_marginLeft="15dp"
            android:layout_width="match_parent"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:layout_height="45dp">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="性别"
                android:textSize="22sp" />

            <RadioGroup
                android:id="@+id/sexRadioGroup"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">

                <RadioButton
                    android:id="@+id/maleRadioButton"
                    android:layout_width="75dp"
                    android:layout_height="wrap_content"
                    android:text="男"
                    android:textSize="22sp"/>

                <RadioButton
                    android:id="@+id/femaleRadioButton"
                    android:layout_width="75dp"
                    android:layout_height="wrap_content"
                    android:text="女"
                    android:textSize="22sp"/>
            </RadioGroup>
        </LinearLayout>
        
<!--这两部分的勾选是不同的,起初本来都是想用CheckBox去实现的,但学习过程中又发现了RadioGroup控件,索性就把这个也学习了一遍,发现这两个控件的区别还是蛮大的。区别:
1.RadioButton点击选中后无法再次点击取消选中,而CheckBox可以实现
2.RadioButton不能同时点击选中多个,而CheckBox可选中多个
-->

 <!--设置口味的喜好勾选框-->
        <LinearLayout
            android:layout_marginLeft="15dp"
            android:layout_width="match_parent"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:layout_height="45dp">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="喜好"
                android:textSize="22sp" />

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <CheckBox
                    android:id="@+id/hotCheckBox"
                    android:text="辣"
                    android:textSize="22sp"
                    android:layout_width="65dp"
                    android:layout_height="wrap_content"/>
                <CheckBox
                    android:id="@+id/fishCheckBox"
                    android:text="海鲜"
                    android:textSize="22sp"
                    android:layout_width="100dp"
                    android:layout_height="wrap_content"/>
                <CheckBox
                    android:id="@+id/sourCheckBox"
                    android:text="酸"
                    android:textSize="22sp"
                    android:layout_width="65dp"
                    android:layout_height="wrap_content"/>
            </LinearLayout>
        </LinearLayout>

<!--顾客选择点餐的预算范围-->
        <LinearLayout
            android:layout_marginLeft="15dp"
            android:layout_width="match_parent"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:layout_height="45dp">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="预算"
                android:textSize="22sp" />

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0元"
                    android:textSize="22sp"/>
<!--SeekBar控件实现选择的滑动效果-->
                <SeekBar
                    android:id="@+id/seekBar"
                    android:layout_width="230dp"
                    android:max="100"
                    android:layout_height="wrap_content"/>

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="100元"
                    android:textSize="22sp"/>
            </LinearLayout>
        </LinearLayout>

<!--设置Button按钮----点击"寻找菜品"显示相应的菜品-->
        <Button
            android:id="@+id/searchButton"
            android:layout_width="300dp"
            android:layout_height="100dp"
            android:text="寻找菜品"
            android:layout_gravity="center_horizontal"
            android:gravity="center_horizontal"
            android:textSize="22sp"/>
        
    </LinearLayout>

<LinearLayout
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="0dp"
        android:layout_weight="1">
        
        <ImageView
            android:id="@+id/foodImageView"
            android:src="@drawable/ic_launcher_background"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="3"/>
        <!--用于切换下一个菜品,并可显示菜品及顾客的信息-->
        <ToggleButton
            android:id="@+id/showToggleButton"
            android:textOff="下一个"
            android:textOn="显示信息"
            android:layout_gravity="center_horizontal"
            android:gravity="center_horizontal"
            android:layout_width="300dp"
            android:layout_height="50dp"/>

    </LinearLayout>

</LinearLayout>

MainActivity

public class MainActivity extends AppCompatActivity {

    private EditText mNameEditText;
    private RadioGroup mSexRadioGroup;
    private CheckBox mHotCheckBox, mFishCheckBox, mSourCheckBox;
    private SeekBar mSeekBar;
    private Button mSearchButton;
    private ImageView mFoodImageView;
    private ToggleButton mToggleButton;

    private List<Food> mFoods;
    private Person mPerson;
    private List<Food> mFoodResult;

    private boolean mIsFish;
    private boolean mIsSour;
    private boolean mIsHot;
    private int mPrice;

    private int mCurrentIndex;

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

        //初始化控件
        findViews();

        //初始化数据
        initData();

        //为控件添加监听器,实现基本功能
        setListeners();

        //自测

    }

    private void findViews() {   //初始化控件
        mNameEditText = findViewById(R.id.nameEditText);
        mSexRadioGroup = findViewById(R.id.sexRadioGroup);
        mHotCheckBox = findViewById(R.id.hotCheckBox);
        mFishCheckBox = findViewById(R.id.fishCheckBox);
        mSourCheckBox = findViewById(R.id.sourCheckBox);
        mSeekBar = findViewById(R.id.seekBar);
        mSeekBar.setProgress(30);   //
        mSearchButton = findViewById(R.id.searchButton);
        mToggleButton = findViewById(R.id.showToggleButton);
        mToggleButton.setChecked(true);
        mFoodImageView = findViewById(R.id.foodImageView);
    }

    private void initData(){     //初始化数据
        mFoods = new ArrayList<>();
        mFoods.add(new Food("麻辣香锅", 55, R.drawable.malaxiangguo, true, false, false));
        mFoods.add(new Food("水煮鱼", 48, R.drawable.shuizhuyu, true, true, false));
        mFoods.add(new Food("麻辣火锅", 80, R.drawable.malahuoguo, true, true, false));
        mFoods.add(new Food("清蒸鲈鱼", 68, R.drawable.qingzhengluyu, false, true, false));
        mFoods.add(new Food("桂林米粉", 15, R.drawable.guilinmifen, false, false, false));
        mFoods.add(new Food("上汤娃娃菜", 28, R.drawable.shangtangwawacai, false, false, false));
        mFoods.add(new Food("红烧肉", 60, R.drawable.hongshaorou, false, false, false));
        mFoods.add(new Food("木须肉", 40, R.drawable.muxurou, false, false, false));
        mFoods.add(new Food("酸菜牛肉面", 35, R.drawable.suancainiutoumian, false, false, false));
        mFoods.add(new Food("西芹炒百合", 38, R.drawable.xiqinchaobaihe, false, false, false));
        mFoods.add(new Food("酸辣汤", 40, R.drawable.suanlatang, true, false, true));

        mPerson = new Person();
        mFoodResult = new ArrayList<>();
    }

    private void setListeners(){
        //设置单选框
        //RadioGroupListener radioGroupListener = new RadioGroupListener();
        mSexRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId){
                    case R.id.maleRadioButton:
                        mPerson.setSex("男");
                        break;
                    case R.id.femaleRadioButton:
                        mPerson.setSex("女");
                        break;
                }
            }
        });

        //设置复选框
        mFishCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                mIsFish = isChecked;

            }
        });
        mSourCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                mIsSour = isChecked;
            }
        });
        mHotCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                mIsHot = isChecked;
            }
        });

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                //int price = seekBar.getProgress();
                mPrice = seekBar.getProgress();
                Toast.makeText(MainActivity.this, "价格: " + mPrice, Toast.LENGTH_SHORT ).show();
                
            }
        });

        mSearchButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                search();
            }
        });

        mToggleButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mToggleButton.isChecked()){
                    mCurrentIndex++;
                    if (mCurrentIndex < mFoodResult.size()){
                        mFoodImageView.setImageResource(mFoodResult.get(mCurrentIndex).getPic());
                    }
                } else{
                    if (mCurrentIndex < mFoodResult.size()) {
                        String foodNmae = mFoodResult.get(mCurrentIndex).getName();
                        String personName = mNameEditText.getText().toString();
                        String sex = mPerson.getSex();
                        Toast.makeText(MainActivity.this, "菜名: " + foodNmae + "\n客户: " + personName + "\n性别: " + sex, Toast.LENGTH_SHORT ).show();
                    } else{
                        Toast.makeText(MainActivity.this, "抱歉,本店没有符合您口味的菜品!", Toast.LENGTH_SHORT ).show();
                    }
                }
            }
        });
    }

    //查找菜品
    private void search() {
        //结果列表每次都要清空
        //遍历所有的菜
        //如果符合条件,则加入到结果列表中

        //如果为空,先初始化
        if(mFoodResult == null){
            mFoodResult = new ArrayList<>();
        }

        //先清除之前的结果
        mFoodResult.clear();
        //当前显示的是结果中的第几个菜
        mCurrentIndex = 0;

        //对菜品进行遍历
        for (int index = 0; index < mFoods.size(); index++) {
            Food food = mFoods.get(index);
            if (food != null) {
                //如果价格要小于设定的价格且是顾客选择的口味
                if (food.getPrice() < mPrice &&
                        (food.isHot() == mIsHot || food.isFish() == mIsFish || food.isSour() == mIsSour)){
                            mFoodResult.add(food);
                }
            }
        }

        //先显示第一张图片
        if (mCurrentIndex < mFoodResult.size()) {
            mFoodImageView.setImageResource(mFoodResult.get(mCurrentIndex).getPic());
        }
    }


}

Food类

public class Food {
    private String name;
    private int price;
    private int pic;
    private boolean hot;
    private boolean fish;
    private boolean sour;

    //构造方法
    public Food(String name, int price, int pic, boolean hot, boolean fish, boolean sour) {
        this.name = name;
        this.price = price;
        this.pic = pic;
        this.hot = hot;
        this.fish = fish;
        this.sour = sour;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public int getPic() {
        return pic;
    }

    public void setPic(int pic) {
        this.pic = pic;
    }

    public boolean isHot() {
        return hot;
    }

    public void setHot(boolean hot) {
        this.hot = hot;
    }

    public boolean isFish() {
        return fish;
    }

    public void setFish(boolean fish) {
        this.fish = fish;
    }

    public boolean isSour() {
        return sour;
    }

    public void setSour(boolean sour) {
        this.sour = sour;
    }

    @Override
    public String toString() {
        return "Food{" +
                "name='" + name + '\'' +
                ", price='" + price + '\'' +
                ", pic=" + pic +
                ", hot=" + hot +
                ", fish=" + fish +
                ", sour=" + sour +
                '}';
    }
}

Person类

public class Person {

    private String name;
    private String sex;
    private Food food;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Food getFood() {
        return food;
    }

    public void setFood(Food food) {
        this.food = food;
    }
}

运行结果:

总结

这一次的Demo练习收获不少,熟悉了不少,同时也意识到自己的Java也需要加快进度去学习,理清Activity的实现过程。下一阶段将进一步巩固数据存储以及网络编程部分。

本文地址：https://blog.csdn.net/qq_45921336/article/details/107484399