一个小实例——借书Demo

Step 1 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:background="#22ff55dd"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:gravity="center"
        android:text="借    书"
        android:textColor="#c51162"
        android:textSize="40sp"
        android:background="#ede7f6"
        android:layout_marginBottom="10dp"
        />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="读 者 ："
            android:textSize="18sp" />
        <EditText
            android:id="@+id/mEditName"
            android:layout_width= "150dp"
            android:layout_height="wrap_content"
            />
        </LinearLayout>
        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="性别 ："
            android:textSize="18sp" />

            <RadioGroup
                android:id="@+id/radioGroup"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
              <RadioButton
                    android:id="@+id/male"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="男"
                    android:textSize="16dp"
                    />
                <RadioButton
                    android:id="@+id/female"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="女"
                    android:textSize="16dp"
                    />

            </RadioGroup>
        </LinearLayout>

    </LinearLayout>

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

        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="借出时间 ："
            android:textSize="16sp" />
        <EditText
            android:id="@+id/borrowedTime"
            android:layout_width= "110dp"
            android:layout_height="wrap_content"
            android:inputType="datetime"
            />
        </LinearLayout>
        <LinearLayout
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:layout_height="wrap_content">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:gravity="center"
                android:text="返还时间 ：2020.06.30"
                android:textSize="16dp" />
        </LinearLayout>




    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="爱 好 ："
            android:textSize="18sp" />

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="历史"
            android:textSize="18sp"
            android:layout_marginLeft="16dp"
            android:id="@+id/isHistory" />
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="悬疑"
            android:textSize="18sp"
            android:id="@+id/isHorror" />
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="文艺"
            android:textSize="18sp"
            android:id="@+id/isArt" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:orientation="horizontal" >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="年 龄 ："
            android:textSize="18sp" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0"
            android:layout_marginLeft="50dp"
            android:textSize="16sp" />

        <SeekBar
            android:id="@+id/seekBar"
            android:layout_width="186dp"
            android:layout_height="match_parent"
            android:progress="18"
            android:max="100" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="100"
            android:textSize="16sp" />
    </LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#11223344"
    android:layout_marginTop="10dp"
    android:orientation="horizontal">
    <ImageView
        android:id="@+id/bookPic"
        android:layout_width="0dp"
        android:layout_height="150dp"
        android:layout_weight="1"
        android:src="@drawable/ic_launcher_foreground"
        />
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="150dp"
        android:layout_weight="1"
        android:orientation="vertical"
        >
        <TextView
            android:id="@+id/bookName"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:textSize="20sp"
            android:gravity="center_vertical"
            android:text="@string/bookName"
            />
        <TextView
            android:id="@+id/bookStyle"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:textSize="20sp"
            android:gravity="center_vertical"
            android:text="@string/bookStyle"
            />
        <TextView
            android:id="@+id/bookSuitableAge"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:textSize="20sp"
            android:gravity="center_vertical"
            android:text="@string/bookSuitableAge"
            />

    </LinearLayout>

</LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginTop="10dp">

        <Button
            android:id="@+id/search_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="查找"
            android:background="#e1bee7"/>
        <TextView
            android:id="@+id/showTip"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:textSize="16sp"
            android:gravity="center_vertical"
            android:text="无"
            />
        <Button
            android:id="@+id/next_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="下一个"
            android:background="#e1bee7"/>
    </LinearLayout>
</LinearLayout>

Step 2 初始化控件

public class MainActivity extends AppCompatActivity {


    private EditText readName;
    private RadioGroup mradioGroup;
    private RadioButton maleRadio;
    private  RadioButton femaleRadio;
    private TextView  borrowTime;
    private CheckBox historyCheckBox;
    private  CheckBox  horrorCheckBox;
    private  CheckBox  artCheckBox;
    private SeekBar  ageSeekBar;
    private ImageView bookImageView;
    private  TextView mBookName;
    private  TextView mBookStyle;
    private  TextView mBookSuitableAge;
    private Button  searchButton;
    private  TextView  searchTip;
    private  Button nextButton;

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

        //初始化控件
        initViews();
   
    }

    private void initViews() {
        readName = findViewById(R.id.mEditName);
        mradioGroup = findViewById(R.id.radioGroup);
        maleRadio = findViewById(R.id.male);
        femaleRadio = findViewById(R.id.female);
        borrowTime = findViewById(R.id.borrowedTime);
        historyCheckBox = findViewById(R.id.isHistory);
        horrorCheckBox = findViewById(R.id.isHorror);
        artCheckBox = findViewById(R.id.isArt);
        ageSeekBar = findViewById(R.id.seekBar);
        bookImageView = findViewById(R.id.bookPic);
        mBookName = findViewById(R.id.bookName);
        mBookStyle = findViewById(R.id.bookStyle);
        mBookSuitableAge = findViewById(R.id.bookSuitableAge);
        searchButton= findViewById(R.id.search_button);
        searchTip = findViewById(R.id.showTip);
        nextButton = findViewById(R.id.next_button);
                
        
        
    }
}

Step 3 初始化数据

第一步 创建数据model

public class Book {
    private  String name ;
    private  String style;
    private  int  suitableAge;
    private  int  pic;
    private  boolean isHistory;
    private  boolean isHorror;
    private  boolean isArt;


    public Book() {
    }

    public Book(String name, String style, int suitableAge, int pic, boolean isHistory, boolean isHorror, boolean isArt) {
        this.name = name;
        this.style = style;
        this.suitableAge = suitableAge;
        this.pic = pic;
        this.isHistory = isHistory;
        this.isHorror = isHorror;
        this.isArt = isArt;
    }
    setter &getter method
        ......
        
}

public class Reader {

    private  String  name;
    private  String  sex;
    private  int age;
    private  String dataTime;

    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getDataTime() {
        return dataTime;
    }

    public void setDataTime(String dataTime) {
        this.dataTime = dataTime;
    }
}

第二步 初始化数据

private void initData() {

    //初始化bookList
    bookList = new ArrayList<>();
    bookList.add(new Book("人生感悟","人生/哲学",20,R.drawable.aa,true,false,true));
    bookList.add(new Book("边城","剧情/文艺",30,R.drawable.bb,true,true,true));
    bookList.add(new Book("sapir","未知",20,R.drawable.cc,false,false,true));
    bookList.add(new Book("光辉岁月","剧情/人生",40,R.drawable.dd,true,false,true));
    bookList.add(new Book("宋词三百首","诗词",10,R.drawable.ee,true,false,false));
    bookList.add(new Book("荷花","散文",20,R.drawable.f,true,false,true));
    bookList.add(new Book("中国古代文学","文学",30,R.drawable.ff,true,false,true));
    bookList.add(new Book("无花果","剧情",40,R.drawable.gg,false,true,true));
    bookList.add(new Book("古镇记忆","散文",35,R.drawable.hh,true,true,false));

     reader = new Reader();
      bookResult = new ArrayList<>();

}

Step 4 添加监听器 实现基本功能

private void setListener() {
 readName.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) {
         if(reader!=null){
             reader.setName(s.toString());
         }
     }
 });
     mradioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
         @Override
         public void onCheckedChanged(RadioGroup group, int checkedId) {
             switch (checkedId){
                 case  R.id.male:
                     reader.setSex("男");
                     break;
                 case  R.id.female:
                     reader.setSex("女");
                     break;
                  default:
                      break;
             }
         }
     });
     borrowTime.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) {
                if(reader!=null){
                    //时间格式
                    SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
                    SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd");
                    java.util.Date  data=null;
                     borrowTime1 = s.toString();
                    try {
                     data=  format.parse(borrowTime1);
                        reader.setDataTime(format1.format(data));

                    } catch (ParseException e) {
                        e.printStackTrace();
                    }
                }
         }
     });
     historyCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
         @Override
         public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
               isHistory = isChecked;
         }
     });
    horrorCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            isHorror = isChecked;
        }
    });
    artCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            isArt= isChecked;
        }
    });

    ageSeekBar.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) {
             age = seekBar.getProgress();
             reader.setAge(age);
         Toast.makeText(MainActivity.this,"年龄："+age,Toast.LENGTH_SHORT).show();
        }
    });

    searchButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
             searchBook();
        }
    });
    nextButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


        }
    });
}

Step 5 查找Button 添加点击事件

private void searchBook() {
    //将resultBook清空
    if(bookResult == null)  bookResult = new ArrayList<>();
    bookResult.clear();
    currentIndex= 0;
    //遍历所有书籍
    for(int index = 0; index<bookList.size();index++){
        //将符合条件的书籍放在resultBook里面
        if(bookList.get(index).getSuitableAge()<age

         ){
            if(  bookList.get(index).isHistory()==isHistory
                    ||  bookList.get(index).isHorror()==isHorror
                    ||  bookList.get(index).isArt()==isArt){
                bookResult.add(bookList.get(index));

            }
        }

    }
    //设置显示index = 0 的第一本数据
    if(currentIndex<bookResult.size()){
        bookImageView.setImageResource(bookResult.get(currentIndex).getPic());
        //设置searchTip中的内容
        mBookName.setText(bookResult.get(currentIndex).getName());
        mBookStyle.setText(bookResult.get(currentIndex).getStyle());
       mBookSuitableAge.setText(bookResult.get(currentIndex).getSuitableAge()+"");
       searchTip.setText("符合条件的书共有"+bookResult.size()+"本");
        Toast.makeText(MainActivity.this,"姓名："+reader.getName()+",性别："+reader.getSex()+",年龄："+reader.getAge()+
                ",借出时间："+reader.getDataTime(),Toast.LENGTH_SHORT).show();
    }
}

Step 6 下一个Button 添加点击事件

nextButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {


            currentIndex++;
            if(currentIndex<bookResult.size()){
                bookImageView.setImageResource(bookResult.get(currentIndex).getPic());
                //设置searchTip中的内容
                mBookName.setText(bookResult.get(currentIndex).getName());
                mBookStyle.setText(bookResult.get(currentIndex).getStyle());
                mBookSuitableAge.setText(bookResult.get(currentIndex).getSuitableAge()+"");
                searchTip.setText("符合条件的书共有"+bookResult.size()+"本");
                Toast.makeText(MainActivity.this,"姓名："+reader.getName()+",性别："+reader.getSex()+",年龄："+reader.getAge()+
                        ",借出时间："+reader.getDataTime(),Toast.LENGTH_SHORT).show();


        }else{
            bookResult=new ArrayList<>();
            Toast.makeText(MainActivity.this,"没有啦",Toast.LENGTH_SHORT).show();

        }
    }
});

Step 6 测试结果图

GitHub地址

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