流失布局添加

在这里插入图片描述
主界面 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:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <EditText
            android:id="@+id/edit_keys"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableLeft="@mipmap/ic_launcher"
            android:layout_weight="1"/>
        <Button
            android:layout_width="80dp"
            android:layout_height="50dp"
            android:id="@+id/btn_search"
            android:text="搜索"/>
    </LinearLayout>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:paddingLeft="20dp"
        android:textSize="20sp"
        android:gravity="center_vertical"
        android:text="搜索历史"/>

    <com.example.demoboss1.FlowLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/flow_history_layout"
        android:layout_weight="1">
    </com.example.demoboss1.FlowLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:paddingLeft="20dp"
        android:textSize="20sp"
        android:gravity="center_vertical"
        android:text="热门搜索"/>

    <com.example.demoboss1.FlowLayout
        android:layout_width="match_parent"
        android:id="@+id/flow_hot_layout"
        android:layout_weight="1"
        android:layout_height="match_parent">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="apple"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="iphone"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="华为"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="小米"
            android:textSize="20sp" />
    </com.example.demoboss1.FlowLayout>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="清除历史记录"/>
</LinearLayout>

主java

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private EditText editText;
    private Button btn;
    private FlowLayout flow_history_layout;
    private SqlDao sqlDao;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText=findViewById(R.id.edit_keys);
        btn=findViewById(R.id.btn_search);
        flow_history_layout=findViewById(R.id.flow_history_layout);
        btn.setOnClickListener(this);
        sqlDao=new SqlDao(MainActivity.this);
        List<String> data=sqlDao.query();
        for (int i = 0; i <data.size() ; i++) {
            flow_history_layout.addtext(data.get(i));
        }
    }
    @Override
    public void onClick(View v) {
        if (v.getId()==R.id.btn_search){
            String name = editText.getText().toString();
            ContentValues values=new ContentValues();
            values.put("name",name);
            sqlDao.insert("seven",null,values);
            flow_history_layout.addtext(name);
        }else {
            flow_history_layout.removeAllViews();

//            Cursor query = sqlDao.query("seven", null, null, null, null, null, null);
//            String ins="";
//            while (query.moveToNext()){
//                String name = query.getString(query.getColumnIndex("name"));
//                ins+=name;
//            }
//            Toast.makeText(MainActivity.this,ins.toString(),Toast.LENGTH_SHORT).show();
            sqlDao.delete("seven",null,null);

        }
    }
}

数据库操作

public class SqlDao {
    private final SQLiteDatabase db;
    public SqlDao(Context context){
        sqlate sql=new sqlate(context);
        db=sql.getReadableDatabase();
    }
    public long insert(String table, String nullColumnHack, ContentValues values){
        return db.insert(table,nullColumnHack,values);
    }

    public long delete(String table, String whereClause, String[] whereArgs){
        return db.delete(table,whereClause,whereArgs);
    }
    public List<String> query(){
        Cursor cursor = db.query("seven", null, null, null, null, null, null);
        List<String> list=new ArrayList<>();
        while (cursor.moveToNext()){
            String name=cursor.getString(cursor.getColumnIndex("name"));
            list.add(name);
        }
        return list;
    }
}

自定义view

public class FlowLayout extends FrameLayout{
    //每个子控件的横向间距
    private final static int H_DISTANCE=20;
    //每个子空间的纵向间距
    private final static int V_DISTANCE=20;
    public FlowLayout(@NonNull Context context) {
        super(context);
    }

    public FlowLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
    public FlowLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    public void addtext(String name){
        //获取布局
        TextView textView= (TextView) View.inflate(getContext(),R.layout.item,null);
        //给控件加名字
        textView.setText(name);
        textView.setTextSize(20);
        //宽高自适应
        LayoutParams params=new LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
        //宽高自适应放到每个控件中
        textView.setLayoutParams(params);
        //添加
        addView(textView);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        //获取本机的宽度
        int width = getWidth();
        ///行数
        int row=0;
        //子控件左边的坐标
        int diswidth=20;

        for (int i=0;i<getChildCount();i++){
            //获取每个子控件
            View view=getChildAt(i);
            //获取每个子控件的宽和高
            int viewWidth = view.getWidth();
            int viewheight = view.getHeight();
            if ((viewWidth+diswidth)>width){
                row++;
                diswidth=20;
            }
            int viewTop=row*viewheight+row*V_DISTANCE;
            view.layout(diswidth,viewTop,diswidth+viewWidth,viewTop+viewheight);
            diswidth+=(viewWidth+H_DISTANCE);
        }
    }
}

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