一个小实例——选餐Demo

Step 1 写布局文件

<?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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="15dp"
        android:background="#B9B9F1"
        android:text="@string/start_select_food"
        android:textAlignment="center"
        android:textColorHint="#8a2bE2"
        android:textSize="30dp"
        android:textStyle="bold|italic"
        android:typeface="monospace"
        />


   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal"
       android:layout_marginBottom="15dp"


   >
    <TextView
        android:layout_width="50dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:text="@string/name"
        android:textSize="20dp"
        android:typeface="monospace" />
    <EditText
        android:id="@+id/name_editText"
        android:layout_width="350dp"
        android:layout_height="wrap_content"
        android:hint="请输入姓名"
        />


   </LinearLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginBottom="15dp"

        >
        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:text="性 别"
            android:textSize="20dp"
           />
        <RadioGroup
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:id="@+id/group_radio">

            <RadioButton
                android:id="@+id/maleRaidoButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="10dp"
                android:text="男"
                />
            <RadioButton
                android:id="@+id/femaleRaidoButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="女"
                />
        </RadioGroup>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginBottom="15dp"

        >
        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:text="喜 好"
            android:textSize="20dp"
            />

         <CheckBox
             android:id="@+id/hot_checkbox"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginRight="6dp"
             android:text="辣"  />
        <CheckBox
            android:id="@+id/fish_checkbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="6dp"
            android:text="海鲜"  />
        <CheckBox
            android:id="@+id/sour_checkbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="6dp"
            android:text="酸"  />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginBottom="15dp"
        >
        <TextView
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:text="预 算"
            android:textSize="20dp"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0元"
            />

        <SeekBar
            android:id="@+id/seekbar"
            android:layout_width="211dp"
            android:layout_height="match_parent"
            android:max="100" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="100元"
            />
    </LinearLayout>

    <Button
        android:id="@+id/search_menu_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查找菜品" />
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:orientation="vertical"
    android:layout_weight="1"
    >

    <ImageView
        android:id="@+id/food_imageView"
        android:src="@drawable/ic_launcher_foreground"
        android:layout_width="match_parent"
        android:layout_height="255dp" />

    <ToggleButton
        android:id="@+id/show_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textOff="下一个"
        android:textOn="显示信息" />

</LinearLayout>

Step 2 初始化控件

 private EditText mNameEditText ;
 private RadioGroup mSexRadioGroup;
 private CheckBox mHotCheckBox;
 private  CheckBox mFishCheckBox;
 private  CheckBox mSourCheckBox ;
 private SeekBar mSeekBar;
 private  Button mSearchButton;
 private ImageView mimageView;
 private ToggleButton mNextButton;
 private Person person;
private List<Food> foodResult;
private List<Food> foods;
private boolean isFish;
private boolean isHot;
private boolean isSour;
private int price;
private int currentIndex;


    private void findViews() {
        mNameEditText=findViewById(R.id.name_editText);
        mSexRadioGroup = findViewById(R.id.group_radio);
        mHotCheckBox = findViewById(R.id.hot_checkbox);
        mFishCheckBox = findViewById(R.id.fish_checkbox);
        mSourCheckBox = findViewById(R.id.sour_checkbox);
        mSeekBar = findViewById(R.id.seekbar);
        mSearchButton = findViewById(R.id.search_menu_button);
        mimageView = findViewById(R.id.food_imageView);
        mNextButton = findViewById(R.id.show_button);

    }

Step 3 初始化数据

private void initData() {
     foods = new ArrayList<>();
    //初始化食物数据
    foods.add(new Food("桂林米粉",25,R.drawable.guilin,false,false,true));
    foods.add(new Food("红烧肉",60,R.drawable.hongshaorou,false,false,false));
    foods.add(new Food("麻辣火锅",40,R.drawable.malahuoguo,true,false,false));
    foods.add(new Food("麻辣香锅",50,R.drawable.malaxiangguo,true,false,false));
    foods.add(new Food("木须肉",30,R.drawable.muxurou,false,false,false));
    foods.add(new Food("清蒸鲈鱼",65,R.drawable.qingzhengluyu,false,true,false));
    foods.add(new Food("水煮鱼",45,R.drawable.shuizhuyu,true,true,false));
    foods.add(new Food("酸辣汤",25,R.drawable.suanlatang,true,false,true));
    foods.add(new Food("西芹",23,R.drawable.xiqin,false,false,false));
    foods.add(new Food("娃娃菜",25,R.drawable.wawacai,false,false,false));
    foods.add(new Food("牛肉面",25,R.drawable.suncainiuroumian,false,false,true));

    //初始化person数据
     person = new Person();
     foodResult = new ArrayList<>();
}

Step 4 添加监听器 实现基本功能

private void setListeners() {

    //为EditText添加监听
    mNameEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
            //更它的内容
            if(person!=null){
                person.setName(s.toString());
            }
        }
    });
    //设置单选框listener
    mSexRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            switch (checkedId){

                case R.id.maleRaidoButton:
                      person.setSex("男");
                     break;
                case R.id.femaleRaidoButton:
                    person.setSex("女");
                    break;
                 default:
                     break;
            }
        }
    });

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

        }
    });

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

        }
    });

    mSourCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            isSour = 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) {
               price = seekBar.getProgress();
            Toast.makeText(MainActivity.this,"价格："+price,Toast.LENGTH_SHORT).show();
        }
    });

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

           }
        }
    });
}

Step 5 为Button添加监听器寻找菜品

private void seekFood() {

    /**
     * 1.将存放结果的食物集合清空
     * 2.遍历所有事物
     * 3.将符合条件的食物存在foodResult里
     * */
    if(foodResult==null){
        foodResult= new ArrayList<>();
    }

    foodResult.clear();
    //结果食物列表中的当前索引
    currentIndex = 0;
    for(int index = 0;index<foods.size() ;index++){
        Food food = foods.get(index);
        if(food != null){

          if(food.getPrice()<price){
              if( isHot ==true){
                  if(food.isHotFood())
                  foodResult.add(food);
              }else if(isFish == true){
                    if(food.isFishFood())
                      foodResult.add(food);
              } else if(isSour == true){
                     if(food.isSourFood())
                      foodResult.add(food);
              }
               if(isHot  && isFish ){

                   if(food.isHotFood()||food.isFishFood())
                       foodResult.add(food);
               } else if (isHot  && isSour ){
                   if(food.isHotFood()||food.isSourFood())
                       foodResult.add(food);
               }else if(isSour  && isFish ) {
                   if(food.isSourFood()||food.isFishFood())
                       foodResult.add(food);
               }
              if(isHot ==true && isFish == true &&isSour == true) {
                  if(food.isSourFood()||food.isFishFood()||food.isHotFood())
                      foodResult.add(food);
              }
          }


        }
    }

    //先显示第一张图片
    if(currentIndex<foodResult.size()){
        mimageView.setImageResource(foodResult.get(currentIndex).getPic());
    }
}

Step 6 为ToggleButton 添加监听器 显示信息和下一个

mNextButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
       if(mNextButton.isChecked()){
           currentIndex++;
           if(currentIndex<foodResult.size()){
               mimageView.setImageResource(foodResult.get(currentIndex).getPic());
           }
       }else{
           if(currentIndex<foodResult.size()){


               String foodName = foodResult.get(currentIndex).getName();
               //    String personName = mNameEditText.getText().toString();
               String  personName = person.getName();
               String  sex = person.getSex();
               Toast.makeText(MainActivity.this,"菜名："+ foodName+",人名："+personName +",性别："+sex,Toast.LENGTH_SHORT).show();

           }else{

               Toast.makeText(MainActivity.this,"没有啦!",Toast.LENGTH_SHORT).show();

           }
       }
    }
});

Step 7 测试结果

附 GitHub 地址

https://github.com/IgnorantGirl/ChooseMenuDemo

标签：false,选餐,void,private,foods,实例,Demo,new,public
来源： https://blog.csdn.net/qq_37687466/article/details/105876772