greendao和搜索功能

在 主build.gradle中

repositories {
    google()
    jcenter()
    mavenCentral() // add repository
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.0.0'
    classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

在app的build.gradle中

在开始：

apply plugin: 'org.greenrobot.greendao' // apply plugin

在dependencies上面加

greendao {
    schemaVersion 1//数据库版本号
    daoPackage 'com.com.sky.downloader.greendao'//设置DaoMaster、DaoSession、Dao包名
    targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录
    //targetGenDirTest：设置生成单元测试目录
    //generateTests：设置自动生成单元测试用例
}

最后到依赖：

implementation 'org.greenrobot:greendao:3.2.2' // add library

User类

@Entity(nameInDb = "t_user")
public class User {
    @Id(autoincrement = true)
    private Long id;
    @Property
    private String name;
    @Generated(hash = 873297011)
    public User(Long id, String name) {
        this.id = id;
        this.name = name;
    }
    @Generated(hash = 586692638)
    public User() {
    }
    public Long getId() {
        return this.id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return  name;
    }
}

MyApp类  初始化

public class MyApp extends Application{

    private static DaoSession daoSession;

    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize(this);
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(this, "text.db");
        DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDb());
        daoSession = daoMaster.newSession();
    }
    public static DaoSession getDaoSession(){
        return daoSession;
    }
}

MainActivity类

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private String mNames[] = {
            "笔记本", "空气净化器", "安卓手机",
            "超级大号圆珠笔", "空气滤芯", "超级大号钢笔",
            "气垫cc", "防晒霜"
    };
    /**
     * 请输入商品
     */
    private EditText mSuos;
    /**
     * 搜索
     */
    private Button mBtSuo;
    private MyViewGroup mMvg;
    private ListView mLv;
    /**
     * 清空历史记录
     */
    private Button mDel;
    private UserDao userDao;
    private String name;
    private List<User> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initChildViews();
        DaoSession daoSession = MyApp.getDaoSession();
        userDao = daoSession.getUserDao();
    }

    private void initChildViews() {


        ViewGroup.MarginLayoutParams lp = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        lp.leftMargin = 5;
        lp.rightMargin = 5;
        lp.topMargin = 5;
        lp.bottomMargin = 5;
        for (int i = 0; i < mNames.length; i++) {
            TextView view = new TextView(this);
            view.setText(mNames[i]);
            view.setTextSize(15);
            view.setPadding(15, 3, 15, 4);
            mMvg.addView(view, lp);

            final int finalI = i;
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mSuos.setText(mNames[finalI]);
                    list = userDao.queryBuilder().build().list();
                    User user2 = new User();
                    user2.setName(mNames[finalI]);
                    for (int i = 0; i <list.size() ; i++) {
                        String name1 = list.get(i).getName();
                        if(mNames[finalI].equals(name1)){
                            Toast.makeText(MainActivity.this,"数据库已有",Toast.LENGTH_SHORT).show();
                            return;
                        }
                    }
                    userDao.insert(user2);
                    select();
                }
            });

        }

    }

    private void initView() {
        mSuos = (EditText) findViewById(R.id.suos);
        mBtSuo = (Button) findViewById(R.id.bt_suo);
        mBtSuo.setOnClickListener(this);
        mMvg = (MyViewGroup) findViewById(R.id.mvg);
        mLv = (ListView) findViewById(R.id.lv);
        mDel = (Button) findViewById(R.id.del);
        mDel.setOnClickListener(this);


    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            default:
                break;
            case R.id.bt_suo:
                name = mSuos.getText().toString().trim();
                list = userDao.queryBuilder().build().list();
                User user = new User();
                user.setName(name);
                for (int i = 0; i <list.size() ; i++) {
                    String name1 = list.get(i).getName();
                    if(name.equals(name1)){
                        Toast.makeText(MainActivity.this,"数据库已有",Toast.LENGTH_SHORT).show();
                        Intent intent = new Intent(MainActivity.this, ListActivity.class);
                        intent.putExtra("name",name);
                        startActivity(intent);
                        return;
                    }
                }
                userDao.insert(user);
                select();

                Intent intent = new Intent(MainActivity.this, ListActivity.class);
                intent.putExtra("name",name);
                startActivity(intent);

                break;
            case R.id.del:
                             userDao.deleteAll();
                select();
                break;
        }
    }
    
    private void select(){
        list = userDao.queryBuilder().build().list();
        ArrayAdapter arrayAdapter = new ArrayAdapter(MainActivity.this,android.R.layout.simple_list_item_1, list);
        mLv.setAdapter(arrayAdapter);

    }
    
}

流式布局MyViewGroup类

public class MyViewGroup extends ViewGroup {

    //存储所有子View
    private List<List<View>> mAllChildViews = new ArrayList<>();
    //每一行的高度
    private List<Integer> mLineHeight = new ArrayList<>();

    public MyViewGroup(Context context) {
        this(context, null);
        // TODO Auto-generated constructor stub
    }
    public MyViewGroup(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
        // TODO Auto-generated constructor stub
    }
    public MyViewGroup(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub

        //父控件传进来的宽度和高度以及对应的测量模式
        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        //如果当前ViewGroup的宽高为wrap_content的情况
        int width = 0;//自己测量的 宽度
        int height = 0;//自己测量的高度
        //记录每一行的宽度和高度
        int lineWidth = 0;
        int lineHeight = 0;

        //获取子view的个数
        int childCount = getChildCount();
        for(int i = 0;i < childCount; i ++){
            View child = getChildAt(i);
            //测量子View的宽和高
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            //得到LayoutParams
            MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams();
            //子View占据的宽度
            int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
            //子View占据的高度
            int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
            //换行时候
            if(lineWidth + childWidth > sizeWidth){
                //对比得到最大的宽度
                width = Math.max(width, lineWidth);
                //重置lineWidth
                lineWidth = childWidth;
                //记录行高
                height += lineHeight;
                lineHeight = childHeight;
            }else{//不换行情况
                //叠加行宽
                lineWidth += childWidth;
                //得到最大行高
                lineHeight = Math.max(lineHeight, childHeight);
            }
            //处理最后一个子View的情况
            if(i == childCount -1){
                width = Math.max(width, lineWidth);
                height += lineHeight;
            }
        }
        //wrap_content
        setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width,
                modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        // TODO Auto-generated method stub
        mAllChildViews.clear();
        mLineHeight.clear();
        //获取当前ViewGroup的宽度
        int width = getWidth();

        int lineWidth = 0;
        int lineHeight = 0;
        //记录当前行的view
        List<View> lineViews = new ArrayList<View>();
        int childCount = getChildCount();
        for(int i = 0;i < childCount; i ++){
            View child = getChildAt(i);
            MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            //如果需要换行
            if(childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width){
                //记录LineHeight
                mLineHeight.add(lineHeight);
                //记录当前行的Views
                mAllChildViews.add(lineViews);
                //重置行的宽高
                lineWidth = 0;
                lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
                //重置view的集合
                lineViews = new ArrayList();
            }
            lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
            lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin);
            lineViews.add(child);
        }
        //处理最后一行
        mLineHeight.add(lineHeight);
        mAllChildViews.add(lineViews);

        //设置子View的位置
        int left = 0;
        int top = 0;
        //获取行数
        int lineCount = mAllChildViews.size();
        for(int i = 0; i < lineCount; i ++){
            //当前行的views和高度
            lineViews = mAllChildViews.get(i);
            lineHeight = mLineHeight.get(i);
            for(int j = 0; j < lineViews.size(); j ++){
                View child = lineViews.get(j);
                //判断是否显示
                if(child.getVisibility() == View.GONE){
                    continue;
                }
                MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
                int cLeft = left + lp.leftMargin;
                int cTop = top + lp.topMargin;
                int cRight = cLeft + child.getMeasuredWidth();
                int cBottom = cTop + child.getMeasuredHeight();
                //进行子View进行布局
                child.layout(cLeft, cTop, cRight, cBottom);
                left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
            }
            left = 0;
            top += lineHeight;
        }

    }
    /**
     * 与当前ViewGroup对应的LayoutParams
     */
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        // TODO Auto-generated method stub

        return new MarginLayoutParams(getContext(), attrs);
    }
}

布局

<?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:orientation="vertical"
    tools:context="com.example.administrator.yuekaomoni.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center_vertical"
        android:orientation="horizontal">
        <ImageView
            android:layout_width="45dp"
            android:layout_height="45dp"
            android:src="@drawable/leftjiantou"/>
        <EditText
            android:layout_width="350dp"
            android:layout_height="45dp"
            android:id="@+id/suos"
            android:hint="请输入商品"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="搜索"
            android:textColor="#fff"
            android:background="#FFEFA718"
            android:id="@+id/bt_suo"/>
    </LinearLayout>

    <com.example.administrator.yuekaomoni.sousuo.MyViewGroup
        android:layout_width="match_parent"
        android:layout_height="130dp"
        android:layout_marginTop="20dp"
        android:id="@+id/mvg"></com.example.administrator.yuekaomoni.sousuo.MyViewGroup>
    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/lv"></ListView>
<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="清空历史记录"
    android:id="@+id/del"/>
</LinearLayout>