自定义View 流式布局（历史搜索，热门搜索）

xml布局

HeadView的布局（headitem）

HeadView代码

public class HeadView extends LinearLayout {
    private Context mContext;
    private ImageView imageView;
    private EditText editText;

    public HeadView(Context context) {
        super(context);
        mContext=context;
        initView();
    }

    public HeadView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        mContext=context;
        initView();
    }

    public void initView(){
        //添加布局
        View view=View.inflate(mContext,R.layout.headitem,null);
        //获取资源ID
        imageView = view.findViewById(R.id.imageview);
        editText = view.findViewById(R.id.edit_text);
        imageView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                //6.在将要判断的地方，判断是否为空
                if(mCallBack!=null){
                    //7.执行回调方法，传入参数
                    mCallBack.getData(editText.getText().toString());
                }
            }
        });
        addView(view);
    }
    //3.定义成员变量
    CallBack mCallBack;
    //4.传入，并且给成员变量赋值
    //5.在想要的地方进行回调
    public void setOnCallBack(CallBack callBack){
        mCallBack=callBack;
    }
    //1.定义接口
    public interface CallBack{
        //2.定义方法，传入参数
        void getData(String edit);
    }
}

自定义属性在values下建一个attrs.xml

TitleView代码（自定义属性）

@SuppressLint("AppCompatCustomView")
public class TitleView extends TextView {

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

    public TitleView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.TitleView);
        int color = typedArray.getColor(R.styleable.TitleView_textColor, Color.BLACK);
        setTextColor(color);
        //属性回收
        typedArray.recycle();

    }
}

CustonFlowView中的代码

public class CustonFlowView extends LinearLayout {
    private int mChildHeight;//最高的孩子
    private int mLeft=20;//左边距
    private int mTop=20; //上边距
    public CustonFlowView(Context context) {
        super(context);
    }

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //定义父窗口的宽高
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        //测量孩子的大小
        measureChildren(widthMeasureSpec,heightMeasureSpec);
        //找到最高的孩子
        findMaxHeight();
        //初始化
        int left=0,top=0;

        int childCount = getChildCount();
        for (int i=0;iwidthSize){
                   top+=mChildHeight+mTop;
                   left=0;
               }
            }
            left+=view.getMeasuredWidth()+mLeft;
        }
        setMeasuredDimension(widthSize,(top+mChildHeight)>heightSize?heightSize:top+mChildHeight);


    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        findMaxHeight();
        //初始化
        int left=0,top=0;

        int childCount = getChildCount();
        for (int i=0;igetWidth()){
                    top+=mChildHeight+mTop;
                    left=0;
                }
            }
            view.layout(left,top,view.getMeasuredWidth()+left,top+mChildHeight);
            left+=view.getMeasuredWidth()+mLeft;
        }

    }

    private void findMaxHeight() {
        mChildHeight=0;
        int childCount = getChildCount();
        for(int i=0;imChildHeight){
                mChildHeight=view.getMeasuredHeight();
            }
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }
}

数据库
SqlieHelper

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

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table search(id integer primary key autoincrement," +
                "name text," +
                "mTag text)");

    }

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

    }
}

数据库中查询用到的bean类

public class NameBean {
    public String name;
    public String mTag;

    public NameBean(String name, String mTag) {
        this.name = name;
        this.mTag = mTag;
    }

    public String getName() {
        return name;
    }

    public String getmTag() {
        return mTag;
    }
}

Dao层

public class Dao {
    private SqliteHelper helper;
    private SQLiteDatabase database;
    public Dao(Context context){
        helper=new SqliteHelper(context);
        database=helper.getReadableDatabase();
    }
    //添加
    public void add(String name,String mTag){
        ContentValues values=new ContentValues();
        values.put("name",name);
        values.put("mTag",mTag);
        database.insert("search",null,values);
    }
    //查询
    public List select(){
        List list=new ArrayList<>();
        Cursor query = database.query("search", null, null, null, null, null, null);
        while (query.moveToNext()){
            String name = query.getString(query.getColumnIndex("name"));
            String mTag = query.getString(query.getColumnIndex("mTag"));
            NameBean bean=new NameBean(name,mTag);
            list.add(bean);

        }
        return list;
    }
    //删除
    public void delAll(){
        database.delete("search",null,null);
    }
    public void del(String tj){
        database.delete("search","mTag=?",new String[]{tj});
    }

}

Activity中的代码

public class SearchActivity extends AppCompatActivity {

    private HeadView headView;
    private CustonFlowView custonFlowView;
    private CustonFlowView hot_view;
    private String str[]=new String[]{"辣条","薯片","火腿肠","酸辣粉","米线","奶茶嫁给粉","麻辣烫","黄焖鸡","大虾","酸菜鱼"};
    private Dao dao;
    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_search);
        initView(savedInstanceState);
        initData();
    }

   private void initData() {
        dao=new Dao(this);
        //查询
       final List list = dao.select();
       for(int i=0;i

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