MainActivity

public class MainActivity extends AppCompatActivity {

    private String[] strings=new String[]{"流感","咳嗽","過敏","發燒","感冒","溼疹","便祕","痔瘡","協和","鼻炎","失眠","通風","上火","腳氣"};
    HotView hotView,history;
    EditText editText;
    SqliteDao dao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dao=new SqliteDao(MainActivity.this);
        editText=findViewById(R.id.et);
        hotView=findViewById(R.id.hotview);
        history=findViewById(R.id.history);
        for(String str:strings){
            TextView textView=new TextView(MainActivity.this);
            textView.setText(str);
            textView.setBackgroundResource(R.drawable.edit_bg);
            textView.setTextSize(24);
            hotView.addView(textView);
        }
        //查詢資料庫裡的資料
        List<Bean> beans = dao.selAll();
        if(beans.size()!=0){
            for(Bean bean:beans){
                TextView textView=new TextView(MainActivity.this);
                textView = new TextView(MainActivity.this);
                textView.setText(bean.getContent());
                textView.setTag(bean.getUuid());
                textView.setBackgroundResource(R.drawable.edit_bg);
                textView.setTextSize(24);
                history.addView(textView);
                //長按刪除
                textView.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        String tag= String.valueOf(v.getTag());
                        Log.i("TEST",tag+"--=-");
                        dao.del(tag);
                        history.removeView(v);
                        return true;
                    }
                });
            }
        }
        //點選搜尋圖片 新增資料
        findViewById(R.id.add).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TextView textView=new TextView(MainActivity.this);
                textView=new TextView(MainActivity.this);
                textView.setText(editText.getText().toString());
                textView.setBackgroundResource(R.drawable.edit_bg);
                textView.setTextSize(24);
                //判斷資料庫裡是否有此資料 有不新增 沒有就新增
                boolean b = dao.sel(editText.getText().toString());
                if(!editText.getText().toString().equals("") && b){
                    UUID uuid=UUID.randomUUID();
                    textView.setTag(uuid);
                    Log.i("TEST",String.valueOf(uuid));
                    dao.add(editText.getText().toString(),String.valueOf(uuid));
                    history.addView(textView);
                }
                //長按刪除
                textView.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        String tag= String.valueOf(v.getTag());
                        dao.del(tag);
                        history.removeView(v);
                        return true;
                    }
                });
            }
        });
        //點選清空所有 清空資料庫資料同時 檢視也清空
        findViewById(R.id.delAll).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dao.delAll();
                history.removeAllViews();
            }
        });
    }
}
 

HotView

public class HotView extends LinearLayout {

    private int mChildMaxHeight;
    //邊距
    private int mVSpace = 20;
    private int mHSpace = 20;


    public HotView(Context context) {
        super(context);
    }

    public HotView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        // 拿到父容器推薦的寬和高以及計算模式
        int sizeWidth=MeasureSpec.getSize(widthMeasureSpec);
        int sizeHeight=MeasureSpec.getSize(heightMeasureSpec);
        //測量孩子的大小
        measureChildren(widthMeasureSpec,heightMeasureSpec);
        //尋找孩子中最高的一個孩子,找到的值會放在mChildMaxHeight變數中
        findMaxChildMaxHeight();
        //初始化值
        int left=0,top=0;
        //迴圈所有的孩子
        int childCount=getChildCount();
        for(int i=0;i<childCount;i++){
            View view=getChildAt(i);
            //是否是一行的開頭
            if(left!=0){
                //需要換行了,因為放不下啦
                if((left+view.getMeasuredWidth())>sizeWidth){
                    //計算出下一行的top
                    top+=mChildMaxHeight+mVSpace;
                    left=0;
                }
            }
            left+=view.getMeasuredWidth()+mHSpace;
        }
        setMeasuredDimension(sizeWidth,(top+mChildMaxHeight)>sizeHeight?sizeHeight:top+mChildMaxHeight);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);

        findMaxChildMaxHeight();
        //開始安排孩子的位置

        //初始化值
        int left=0,top=0;
        //迴圈所有的孩子
        int childCount=getChildCount();
        for(int i=0;i<childCount;i++){
            View view=getChildAt(i);
            if(left!=0){
                if((left+view.getMeasuredWidth())>getWidth()){
                    //計算出下一行的top
                    top+=mChildMaxHeight+mVSpace;
                    left=0;
                }
            }
            //安排孩子的位置
            view.layout(left,top,left+view.getMeasuredWidth(),top+view.getMeasuredHeight());
            left+=view.getMeasuredWidth()+mHSpace;
        }
    }

    private void findMaxChildMaxHeight() {
        mChildMaxHeight=0;
        int childCount=getChildCount();
        for(int i=0;i<childCount;i++){
            View view=getChildAt(i);
            if(view.getMeasuredHeight()>mChildMaxHeight){
                mChildMaxHeight=view.getMeasuredHeight();
            }
        }
    }

}
 

資料庫的建立

public class SqliteHelper extends SQLiteOpenHelper {
    public SqliteHelper(Context context) {
        super(context, "User.db", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        //建立表
        db.execSQL("create table history(id integer primary key autoincrement," +
                "content text," +
                "uuid text)");

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}
 

資料庫資料的修改

public class SqliteDao {

    private SQLiteDatabase database;

    public SqliteDao(Context context) {
        database=new SqliteHelper(context).getWritableDatabase();
    }
    //新增
    public void add(String s, String string){
        ContentValues values=new ContentValues();
        values.put("content",s);
        values.put("uuid",string);
        database.insert("history",null,values);
    }
    //全部刪除
    public void delAll(){
        database.delete("history",null,null);
    }
    //單個查詢
    public boolean sel(String string){
        Cursor query = database.query("history", null, "content=?", new String[]{string}, null, null, null);
        return query.getCount()==0?true:false;
    }
    //查詢全部
    public List<Bean> selAll(){
        List<Bean> list=new ArrayList<>();
        Cursor query = database.query("history", null, null, null, null, null, null);
        while(query.moveToNext()){
            String content = query.getString(query.getColumnIndex("content"));
            String uuid = query.getString(query.getColumnIndex("uuid"));
            list.add(new Bean(content,uuid));
        }
        return list;
    }

    public void del(String tag) {
        database.delete("history","uuid=?",new String[]{tag});
    }
}

Bean類

public class Bean {
    private String content;
    private String uuid;

    public Bean(String content, String uuid) {
        this.content = content;
        this.uuid = uuid;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getUuid() {
        return uuid;
    }

    public void setUuid(String uuid) {
        this.uuid = uuid;
    }
}

acitivity_main.xml

<?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:orientation="vertical"
    android:layout_height="wrap_content"
    tools:context=".MainActivity">
    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <ImageView
            android:id="@+id/add"
            android:layout_width="40dp"
            android:layout_height="40dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:src="@drawable/search"
            />
        <EditText
            android:id="@+id/et"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/add"
            />
    </android.support.constraint.ConstraintLayout>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:textFontWeight="500"
        android:layout_marginLeft="20dp"
        android:text="搜尋歷史"/>
    <com.example.day04_demo01.view.HotView
        android:id="@+id/history"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        />
    <Button
        android:id="@+id/delAll"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="清空記錄"
        android:layout_gravity="center"
        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:layout_marginLeft="20dp"
        android:text="熱門搜尋"/>
    <com.example.day04_demo01.view.HotView
        android:id="@+id/hotview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        />
</LinearLayout>

單個textview佈局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:gravity="center"
        android:textSize="24sp"
        android:layout_weight="1"
        />
</LinearLayout>

edit_bg.xml TextView背景

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#00000000" />
    <corners android:radius="10px" />
    <stroke
        android:width="1px"
        android:color="#999999" />
</shape>

效果圖