Android开发流式布局关联数据库

效果如下

自定义View组合控件header_View

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <EditText
        android:id="@+id/search_edit"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="6"
        android:drawableLeft="@drawable/b"
        android:drawablePadding="5dp"
        android:paddingLeft="10dp"
        android:layout_marginTop="10dp"
        android:hint="搜索" />

    <TextView
        android:id="@+id/cancel_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center"
        android:layout_marginTop="10dp"
        android:textSize="20sp"
        android:text="添加" />
</LinearLayout>

组合控件标题MyHeaderView

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.day4.R;

public class MyXHView extends LinearLayout {
    private EditText mSearch;
    private TextView mCancel;

    public MyXHView(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.header_view, this);
        mSearch = findViewById(R.id.search_edit);
        mCancel = findViewById(R.id.cancel_text);
        mSearch.setBackgroundResource(R.drawable.edit_style);
    }

    public String getEditStr() {
        return mSearch.getText().toString();
    }

    public TextView getCancel() {
        return mCancel;
    }

    public EditText getEditSearch() {
        return mSearch;
    }
}

布局文件activity_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:layout_height="match_parent"
    android:background="#fff"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <!--自定义的标题栏-->
    <com.example.day4.weight.MyXHView
        android:id="@+id/header_View"
        android:layout_width="match_parent"
        android:layout_height="80dp" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="搜索历史"
            android:textSize="20sp" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_marginRight="10dp"
            android:id="@+id/delete_btn"
            android:src="@drawable/a" />
    </RelativeLayout>

    <com.example.day4.weight.MyFloatLayout
        android:id="@+id/MyFloat_Layout_History"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:textColor="@color/colorPrimaryDark" ></com.example.day4.weight.MyFloatLayout>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:textSize="20sp"
        android:text="热门搜索" />

    <com.example.day4.weight.MyFloatLayout
        android:id="@+id/MyFloat_Layout"
        android:layout_width="match_parent"
        app:textColor="@color/colorPrimaryDark"
        android:layout_height="wrap_content"></com.example.day4.weight.MyFloatLayout>
</LinearLayout>

创建流式布局类FlowLayout 继承LinearLayout

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.day4.R;

import java.util.ArrayList;

/**
 * 获取两种屏幕宽和高的方式
 * 最常用的是 DisplayMetrics
 * WindowManager 不常用了 我查看已经加上删除线 过时
 */
public class MyFloatLayout extends LinearLayout {
    private int mScreenWidth;
    private String mColor;
    public MyFloatLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
//        WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
//        Display display = manager.getDefaultDisplay();
//        display.getWidth();
        mScreenWidth = metrics.widthPixels;
        //设置这个布局垂直显示
        setOrientation(VERTICAL);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.GroupDemoView);
        if (typedArray!=null){
            mColor= (String) typedArray.getText(R.styleable.GroupDemoView_textColor);
        }
    }
    public void removeChildView(){
        //移除所有子控件
        removeAllViews();
    }

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

    public void setData(ArrayList<String> datas) {
        LinearLayout linearLayout = getLin();
        for (int i = 0; i < datas.size(); i++) {
            final String data = datas.get(i);
            int numWidth = 0;
            //得到一行LinearLayout到底有多少子控件 因为我要计算每个子控件加在一起的宽度
            int childCount = linearLayout.getChildCount();
            //这个for循环只是计算一行LinearLayout的所有子控件的宽的和
            for (int j = 0; j < childCount; j++) {
                //通过index得到每一个子控件
                TextView tv = (TextView) linearLayout.getChildAt(j);
                LayoutParams layoutParams = (LayoutParams) tv.getLayoutParams();
                int leftMargin = layoutParams.leftMargin;
                //测量这个tv的高和宽
                tv.measure(getMeasuredWidth(), getMeasuredHeight());
                numWidth += tv.getMeasuredWidth() + leftMargin + tv.getPaddingLeft() + tv.getPaddingRight();
            }
            TextView dataText = getText();
            dataText.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getContext(),data,Toast.LENGTH_SHORT).show();
                }
            });
            //设置属性
            LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            params.leftMargin = 10;
            params.topMargin = 10;
            dataText.setLayoutParams(params);
            dataText.setText(data);
            dataText.measure(getMeasuredWidth(), getMeasuredHeight());
            int dataTextWidth = dataText.getMeasuredWidth() + dataText.getPaddingLeft() + dataText.getPaddingRight();
            //考虑到一个字符串很长，就直接超过整个屏幕的高了
            if (dataTextWidth >= mScreenWidth) {
                String s = data.substring(0, 4);
                dataText.setText(s + "...");
                dataText.measure(getMeasuredWidth(), getMeasuredHeight());
                dataTextWidth = dataText.getMeasuredWidth();
            }
            if (mScreenWidth >= numWidth + dataTextWidth) {
                linearLayout.addView(dataText);
            } else {
                //这里面对LinearLayout重新赋值 通过getLin换行
                linearLayout = getLin();
                linearLayout.addView(dataText);
            }
        }
    }

    private TextView getText() {
        TextView textView = new TextView(getContext());
        textView.setTextSize(16);
        textView.setTextColor(Color.parseColor(mColor) );
        textView.setBackgroundResource(R.drawable.text_style);
        textView.setPadding(10, 5, 10, 5);
        return textView;
    }

    //初始化子LinearLayo
    private LinearLayout getLin() {

        LinearLayout linearLayout = new LinearLayout(getContext());
        //LayoutParams控制组件大小的一个工具类
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        linearLayout.setLayoutParams(params);
        //this本类对象
        this.addView(linearLayout);//只要重新添加View了自动换行了
        return linearLayout;
    }
}

MyOpenHelper 类 创建数据库

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class MyOpenHelper extends SQLiteOpenHelper {
    public MyOpenHelper(Context context) {
        super(context, "mydata", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table liu(id Integer primary key autoincrement,name text)");
    }

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

    }
}

封装Dao层 增删改查

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.widget.Toast;

import java.util.ArrayList;

public class MyDao {
    private MyOpenHelper helper;
    private SQLiteDatabase mData;
    private Context mContext;

    public MyDao(Context context) {
        mContext = context;
        helper = new MyOpenHelper(context);
        mData = helper.getWritableDatabase();
    }


    public void insertSqlite(String name) {
        ContentValues contentValues = new ContentValues();
        contentValues.put("name", name);
        mData.insert("liu", null, contentValues);
        Toast.makeText(mContext, "插入成功", Toast.LENGTH_SHORT).show();
    }

    public ArrayList<String> selectName() {
        ArrayList<String> list = new ArrayList<>();
        Cursor cursor = mData.query("liu", null, null, null, null, null, null, null);
        while (cursor.moveToNext()) {
            String name = cursor.getString(cursor.getColumnIndex("name"));
            list.add(name);
        }
        return list;
    }

    public void delete() {
        mData.execSQL("delete from liu");
    }

}

调用类 处理功能

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import com.example.day4.sqlitedemo.MyDao;
import com.example.day4.weight.MyFloatLayout;
import com.example.day4.weight.MyXHView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private String[] data = {"流感", "咳嗽", "过敏", "发烧", "感冒", "湿疹", "便秘", "痔疮", "协和", "鼻炎", "失眠", "痛风", "上火", "脚气", "抑郁症", "性欲", "乳腺增生", "头晕", "腰痛"};
    private MyFloatLayout MyFloat_Layout;
    private ArrayList<String> mList = new ArrayList<>();
    private ArrayList<String> mHistory = new ArrayList<>();
    private MyDao myDao;
    private MyXHView header_View;
    private ImageView delete_btn;
    private MyFloatLayout MyFloat_Layout_History;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myDao = new MyDao(this);
        mHistory = myDao.selectName();
        initData();
        initView();
        if (!mHistory.isEmpty()) {
            MyFloat_Layout_History.setData(mHistory);
        }
    }

    private void initData() {
        for (int i = 0; i < data.length; i++) {
            mList.add(data[i]);
        }
    }

    private void initView() {
        header_View = (MyXHView) findViewById(R.id.header_View);
        header_View.getCancel().setOnClickListener(this);
        delete_btn = (ImageView) findViewById(R.id.delete_btn);
        delete_btn.setOnClickListener(this);
        MyFloat_Layout_History = (MyFloatLayout) findViewById(R.id.MyFloat_Layout_History);
        MyFloat_Layout = (MyFloatLayout) findViewById(R.id.MyFloat_Layout);
        MyFloat_Layout.setData(mList);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.cancel_text:
                String name = header_View.getEditStr().trim();
                //判空处理
                if (name.equals("")) {
                    Toast.makeText(MainActivity.this, "输入不能为空", Toast.LENGTH_SHORT).show();
                } else {
                    myDao.insertSqlite(header_View.getEditStr().trim());
                    //自己封装了一个方法删除子控件
                    MyFloat_Layout_History.removeChildView();
                    mHistory.add(name);
                    MyFloat_Layout_History.setData(mHistory);
                    header_View.getEditSearch().setText("");
                }
                break;
            case R.id.delete_btn:
                myDao.delete();
                MyFloat_Layout_History.removeChildView();
                //记得清空历史记录
                mHistory.clear();
                break;
        }
    }
}

以上就是全部代码
项目路径 原代码