GreenDao的簡單使用說明(三)多表的操作1:n

起浮沉落 10年前發布 | 34K 次閱讀 Android開發移動開發

來自： http://blog.csdn.net//chenguang79/article/details/50460718

我們在使用數據庫的時候，大多數都會是多表聯合操作，不會只有一個表的，下面我們就來說一下，多表的操作，這里先拿1：n來說。這是我們平時在設計數據庫時最常用的模式。下面我來看一下，GreenDao對1:n的模式是怎么處理的。

一，我們先要新建兩個表，用來實現1：n。我們先來修改MyDaoGenerator.java這個文件。代碼如下：

package pl.surecase.eu;

import de.greenrobot.daogenerator.DaoGenerator;
import de.greenrobot.daogenerator.Entity;
import de.greenrobot.daogenerator.Property;
import de.greenrobot.daogenerator.Schema;
import de.greenrobot.daogenerator.ToMany;

public class MyDaoGenerator {

    public static void main(String args[]) throws Exception {
        Schema schema = new Schema(3, "greendao");
        schema.setDefaultJavaPackageDao("com.guangda.dao");
        Entity userBean = schema.addEntity("Users");
        userBean.setTableName("Users");
        //userBean.addLongProperty("id").primaryKey().index().autoincrement();
        userBean.addIdProperty();
        userBean.addStringProperty("uSex");
        userBean.addStringProperty("uTelphone");
        userBean.addStringProperty("uAge");
        userBean.addStringProperty("uName");

        //上面是我們用于單表操作的時建立的表


        //下面是我們要建的兩個新表，一個上信息類別，一個是信自，它們的關系是1:n.
        //對于信息類別表，沒有什么好說的，和上面一樣，直接建立一個表就完了，我們主要來看一下信息表中，如何設置外鍵
        Entity infoTypeBean = schema.addEntity("infoType");
        //此處是用來實現序列化的接口
        infoTypeBean.implementsSerializable();
        infoTypeBean.addIdProperty();
        infoTypeBean.addStringProperty("infoName");

        //信息表進行建立
        Entity infoBean = schema.addEntity("infos");
        infoBean.implementsSerializable();
        infoBean.addIdProperty();
        infoBean.addStringProperty("infoTitle");
        infoBean.addStringProperty("infoAuthor");
        infoBean.addStringProperty("infoContent");
        //這里我們為信息表，添加一個typeId外鍵，它就是infoType表的id
        Property typeId = infoBean.addLongProperty("typeId").getProperty();

        //這里是重點，我們為這兩個表建立1:n的關系，并設置關聯字段。
        infoBean.addToOne(infoTypeBean, typeId);
        ToMany addToMany = infoTypeBean.addToMany(infoBean,typeId);
        addToMany.setName("infoes");

        new DaoGenerator().generateAll(schema, args[0]);
    }
}

我在代碼中加了比較詳細的注解，相信大家一看就明白了。

注意：

Schema schema = new Schema(3, "greendao");這里的版本號，你要比之前的版本號大1,原來咱們是1，我這里是3，是因為我當時寫代碼的時候，寫錯了一個地方，沒法子，就又升了一次。哈哈。。。。。。。。

二，修改我們封裝的DaoMaster.OpenHelper代碼，讓他進行升級，代碼如下

package com.example.cg.greendaolearn;


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

import com.guangda.dao.DaoMaster;
import com.guangda.dao.infoTypeDao;
import com.guangda.dao.infosDao;

/**
 * 封裝DaoMaster.OpenHelper方法, 在更新的時候,用來保存原來的數據
 * greenDao默認在更新的時候,會新建表,原來的數據就丟失了
 * Created by cg on 2015/12/28.
 */
public class THDevOpenHelper extends DaoMaster.OpenHelper {

    public THDevOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory) {
        super(context, name, factory);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        switch (oldVersion) {
            case 2:
                //創建新表，注意createTable()是靜態方法
                infosDao.createTable(db, true);
                infoTypeDao.createTable(db,true);

                // 加入新字段
                // db.execSQL("ALTER TABLE 'moments' ADD 'audio_path' TEXT;");

                // TODO
                break;
        }
    }
}

這里我們修改就是onUpgrade方法，在這里添加了創建新表的方法，在這里我多說一句，就是GreenDao在修改原表的時候，它會把原表刪除，這樣就會有一個問題，你原有的數據會丟，這樣，我們就要在這里處理一下，把原表數據存入臨時表中，然后再刪除，最后把數據再導回來。

三，生成建表，我們運行代碼，來看一下生成后的效果

這里有時候，我們在運行MyDaoGenerator.java代碼，生成類的時候，會提示GKB代碼無法運行，這是因為你在這個文件里寫了中文，它不認，就算是你把這個文件轉成了utf-8，也會報這個錯，這時候，我們只能用記事本打開這個文件，然后覆蓋保存，在保存時，編碼選擇 ANSI。就ok了，下面我們看一下，生成的文件列表

這樣，我們的新建的兩個表的bean和操作dao文件都已經生成好了。我們就可以進行后面的，增，刪，改，查工作了。

四，查看生成的bean文件

我們來看一下這里生成的infos.java和infoType.java兩個文件有什么特別之后。我們先來看一下infoType.java代碼，處了代碼被序列化外，我們發現里面多了一些方法，這里主要說一下與1：N關聯有關的方法

public List<infos> getInfoes() {
        if (infoes == null) {
            if (daoSession == null) {
                throw new DaoException("Entity is detached from DAO context");
            }
            infosDao targetDao = daoSession.getInfosDao();
            List<infos> infoesNew = targetDao._queryInfoType_Infoes(id);
            synchronized (this) {
                if(infoes == null) {
                    infoes = infoesNew;
                }
            }
        }
        return infoes;
    }

這個方法，一看名字就知道，這是得到信息列表的，也就是說，我們在得到一個信息分類的同時，只要點一下這個方法，你就可以同時得到此分類下所有的信息，這對于信息量比較少的操作來說，是相當方便的方法。但是對于大數據量來說，就沒有什么意義了。因為List這個分頁處理不行，你可能會說，我直接修改它的代碼不就完了嗎，這個可行，可是GreenDao給出的說明是這個類，最好不要進行修改。

它里面其它的方法，update,delete個人感覺沒什么意義，我一直開始以為，它會產生聯動的效果，就是刪除這個分類的時候，子信息也會被刪除，可是卻沒有發生。

我們再來看一下infos.java里面的代碼

public void setInfoType(infoType infoType) {
        synchronized (this) {
            this.infoType = infoType;
            typeId = infoType == null ? null : infoType.getId();
            infoType__resolvedKey = typeId;
        }
    }

這個個人感覺相當使用，就是我們在得到條信息的時候，可以同時取得它的分類信息。這個在顯示詳細信息的時候相當有用啊。

下面我寫的一些代碼片斷，就是兩個頁，一個顯示信息分類，點擊信息分類，顯示此分類下所有的信息。信息分類和信息的添加，依然采用，toolbar的menu，修改與刪除功能，是長按listView。下面我把代碼放出來：

1, DbService.java添加對兩個新類的操作方法

package com.example.cg.greendaolearn.db;

import android.content.Context;
import android.text.TextUtils;
import android.util.Log;

import com.guangda.dao.DaoSession;
import com.guangda.dao.UsersDao;
import com.guangda.dao.infoTypeDao;
import com.guangda.dao.infosDao;

import java.util.List;

import greendao.Users;
import greendao.infoType;
import greendao.infos;

/**
 * 用戶操作類
 * Created by cg on 2015/12/29.
 */
public class DbService {
    private static final String TAG = DbService.class.getSimpleName();
    private static DbService instance;
    private static Context appContext;
    private DaoSession mDaoSession;
    private UsersDao userDao;
    private infosDao infoDao;
    private infoTypeDao typeDao;


    private DbService() {
    }

    /**
     * 采用單例模式
     * @param context     上下文
     * @return            dbservice
     */
    public static DbService getInstance(Context context) {
        if (instance == null) {
            instance = new DbService();
            if (appContext == null){
                appContext = context.getApplicationContext();
            }
            instance.mDaoSession = BaseApplication.getDaoSession(context);
            instance.userDao = instance.mDaoSession.getUsersDao();
            instance.infoDao = instance.mDaoSession.getInfosDao();
            instance.typeDao = instance.mDaoSession.getInfoTypeDao();
        }
        return instance;
    }

    /**
     * 根據用戶id,取出用戶信息
     * @param id           用戶id
     * @return             用戶信息
     */
    public Users loadNote(long id) {
        if(!TextUtils.isEmpty(id + "")) {
            return userDao.load(id);
        }
        return  null;
    }

    /**
     * 取出所有數據
     * @return      所有數據信息
     */
    public List<Users> loadAllNote(){
        return userDao.loadAll();
    }

    /**
     * 生成按id倒排序的列表
     * @return      倒排數據
     */
    public List<Users> loadAllNoteByOrder()
    {
        return userDao.queryBuilder().orderDesc(UsersDao.Properties.Id).list();
    }

    /**
     * 根據查詢條件,返回數據列表
     * @param where        條件
     * @param params       參數
     * @return             數據列表
     */
    public List<Users> queryNote(String where, String... params){
        return userDao.queryRaw(where, params);
    }


    /**
     * 根據用戶信息,插件或修改信息
     * @param user              用戶信息
     * @return 插件或修改的用戶id
     */
    public long saveNote(Users user){
        return userDao.insertOrReplace(user);
    }


    /**
     * 批量插入或修改用戶信息
     * @param list      用戶信息列表
     */
    public void saveNoteLists(final List<Users> list){
        if(list == null || list.isEmpty()){
            return;
        }
        userDao.getSession().runInTx(new Runnable() {
            @Override
            public void run() {
                for(int i=0; i<list.size(); i++){
                    Users user = list.get(i);
                    userDao.insertOrReplace(user);
                }
            }
        });

    }

    /**
     * 刪除所有數據
     */
    public void deleteAllNote(){
        userDao.deleteAll();
    }

    /**
     * 根據id,刪除數據
     * @param id      用戶id
     */
    public void deleteNote(long id){
        userDao.deleteByKey(id);
        Log.i(TAG, "delete");
    }

    /**
     * 根據用戶類,刪除信息
     * @param user    用戶信息類
     */
    public void deleteNote(Users user){
        userDao.delete(user);
    }


    /**********************信息類別*********************************/

    /**
     * 添加或修改信息類別
     * @param iType     信息類別
     * @return          返回修改信息的id或是新增的信息id
     */
    public Long SaveInfoType(infoType iType)
    {
        return typeDao.insertOrReplace(iType);
    }

    /**
     * 根據類別id,刪除信息類別
     * @param id      信息id
     */
    public void deleteInfoType(long id)
    {
        typeDao.load(id).delete();

    }

    /**
     * 按id倒排序,來顯示所信息類別
     * @return      信息類別列表
     */
    public List<infoType> getAllInfoTypeList()
    {
        return  typeDao.queryBuilder().orderDesc(infoTypeDao.Properties.Id).list();
    }

    /**
     * 根據類別id,取出類別信息
     * @param id
     * @return
     */
    public infoType getInfoType(long id)
    {
        return typeDao.load(id);
    }


    /**********************信息列表*********************************/

    /**
     * 根據信息類別id,取出其類別下所有的信息
     * @param typeid         類別id
     * @return               信息列表
     */
    public List<infos> getInfosByTypeId(long typeid)
    {
        return typeDao.load(typeid).getInfoes();
    }

    /**
     * 添加或修改
     * @param info    信息
     * @return        添加或修改的id
     */
    public long saveInfo(infos info)
    {
        return infoDao.insertOrReplace(info);
    }

    /**
     * 返回所有新聞,用于測試類別刪除的同步性
     * @return    返回所有新聞
     */
    public List<infos> getAllInfos()
    {
        return infoDao.loadAll();
    }

    /**
     * 分頁顯示信息
     * @param typeid          信息類別
     * @param pageNum         當前頁數
     * @param pageSize        每頁顯示數
     * @return                信息列表
     */
    public List<infos> getInfosBypageSize(long typeid,int pageNum,int pageSize)
    {
        return infoDao.queryBuilder().where(infosDao.Properties.TypeId.eq(typeid)).offset(pageNum-1).limit(pageSize).list();
    }
}

2, 分類信息頁面布局代碼：

activity_two_table.xml

<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"
    tools:context="com.example.cg.greendaolearn.twoTableActivity"
    android:orientation="vertical"
    android:background="@color/cornflowerblue">

    <include
        layout="@layout/toolbar" />

    <ListView
        android:id="@+id/lv_twoTable"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

3, 分類信息頁面中listView的item布局：

activity_twotable_lv_item.xml

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

    <TextView
        android:id="@+id/txt_twotable_item_typeName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textColor="@color/greenyellow"/>

</LinearLayout>

4，信息列表的Adapter代碼：

twotable_type_adpter.java

package com.example.cg.greendaolearn.adpater;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.cg.greendaolearn.R;

import java.util.List;

import greendao.infoType;

/**
 * 兩表間，1:n中主表信息列表的adapter
 * Created by cg on 2016/1/4.
 */
public class twotable_type_adpter extends BaseAdapter {

    private List<infoType> list_type;
    private LayoutInflater inflater;

    public twotable_type_adpter(Context context,List<infoType> list_type) {
        this.inflater = LayoutInflater.from(context);
        this.list_type = list_type;
    }

    @Override
    public int getCount() {
        return list_type.size();
    }

    @Override
    public Object getItem(int position) {
        return list_type.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        twoTableType tType;
        if(convertView==null)
        {
            tType = new twoTableType();
            convertView = inflater.inflate(R.layout.activity_twotable_lv_item,null);
            tType.typeName = (TextView)convertView.findViewById(R.id.txt_twotable_item_typeName);

            convertView.setTag(tType);
        }else
        {
            tType = (twoTableType)convertView.getTag();
        }

        tType.typeName.setText(list_type.get(position).getInfoName());

        return convertView;
    }

    class twoTableType
    {
        TextView typeName;
    }
}

5, 信息列表程序代碼：

twoTableActivity.java

package com.example.cg.greendaolearn;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.cg.greendaolearn.adpater.twotable_type_adpter;
import com.example.cg.greendaolearn.db.DbService;

import java.util.ArrayList;
import java.util.List;

import greendao.infoType;

public class twoTableActivity extends AppCompatActivity implements twoTableDialogTypeFragment.addInfoTypeOnClickListener,twoTableDialogTypeItemFragment.txtClickListener {

    private Toolbar toolbar;                                                   //定義toolbar

    private ListView lv_twoTable;
    private List<infoType> list_type;
    private twotable_type_adpter tAdapter;

    private DbService db;

    private twoTableDialogTypeFragment twoDialogType;
    private twoTableDialogTypeItemFragment twoDialogTypeItem;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_two_table);

        toolbar = (Toolbar)this.findViewById(R.id.toolbar);
        toolbar.setTitle("多表操作");                     // 標題的文字需在setSupportActionBar之前，不然會無效
        setSupportActionBar(toolbar);

        db = DbService.getInstance(this);

        initControls();

        initData();
    }

    /**
     * 初始化控件
     */
    private void initControls() {
        lv_twoTable = (ListView)findViewById(R.id.lv_twoTable);
        lv_twoTable.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent dIntent = new Intent();
                dIntent.setClass(twoTableActivity.this,twoTableDetailActivity.class);
                dIntent.putExtra("typeId", list_type.get(position).getId());
                dIntent.putExtra("typeName", list_type.get(position).getInfoName());
                startActivity(dIntent);
            }
        });
        /**
         * 長按事件
         */
        lv_twoTable.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                twoDialogTypeItem = new twoTableDialogTypeItemFragment(list_type.get(position).getId(),position);
                twoDialogTypeItem.show(getFragmentManager(),"item");
                return true;
            }
        });
    }


    private void initData()
    {
        list_type = new ArrayList<>();
        list_type = db.getAllInfoTypeList();
        tAdapter = new twotable_type_adpter(this,list_type);
        lv_twoTable.setAdapter(tAdapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_two_table, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.menu_twoTable_typeAdd) {
            twoDialogType = new twoTableDialogTypeFragment(0,"",0);
            twoDialogType.show(getFragmentManager(),"add");
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    @Override
    public void OnaddInfoTypeOnClickListener(String typeName, long typeId,int postion) {
        infoType iType = new infoType();
        iType.setInfoName(typeName);
        if(typeId!=0)
        {
            iType.setId(typeId);
        }

        if(db.SaveInfoType(iType) < 1)
        {
            Toast.makeText(this, "數據修改失敗！", Toast.LENGTH_SHORT).show();
        }

        if(typeId!=0)
        {
            list_type.remove(postion);
        }
        list_type.add(postion,iType);
        tAdapter.notifyDataSetChanged();

        twoDialogType.dismiss();
    }

    @Override
    public void OntxtClickListener(int flag,long typeId,int postion) {
        //0：刪除 1：修改
        if(flag==0)
        {
            db.deleteInfoType(typeId);
            list_type.remove(postion);
            tAdapter.notifyDataSetChanged();
            Toast.makeText(this,"刪除成功！",Toast.LENGTH_SHORT).show();
        }else
        {
            twoDialogType = new twoTableDialogTypeFragment(list_type.get(postion).getId(),list_type.get(postion).getInfoName(),postion);
            twoDialogType.show(getFragmentManager(),"edit");
        }
        twoDialogTypeItem.dismiss();
    }
}

6，點擊add按鈕彈出框布局：

fragment_onetable_dialog.xml

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

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="新聞類別："
        android:textColor="@color/black"
        android:padding="5dp"/>
    <EditText
        android:id="@+id/edit_twotable_typeName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="2"
        android:textColor="@color/black"/>
</LinearLayout>

7，點擊add按鈕彈出框代碼：

twoTableDialogTypeFragment.java

package com.example.cg.greendaolearn;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;

/**
 * 兩表操作，1:n 新聞類別添加彈出框
 * Created by cg on 2016/1/4.
 */
public class twoTableDialogTypeFragment extends DialogFragment {


    private String typeName;
    private long typeId;
    private int postion;

    private String btnText;

    public twoTableDialogTypeFragment(long typeId,String typeName,int postion) {
        this.typeId = typeId;
        this.typeName = typeName;
        this.postion = postion;
    }

    public interface addInfoTypeOnClickListener
    {
        void OnaddInfoTypeOnClickListener(String typeName,long typeId,int postion);
    }

    private EditText edit_twotable_typeName;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        // Get the layout inflater
        LayoutInflater inflater = getActivity().getLayoutInflater();
        View view = inflater.inflate(R.layout.fragment_twotable_typedialog, null);

        edit_twotable_typeName = (EditText)view.findViewById(R.id.edit_twotable_typeName);
        edit_twotable_typeName.setText(typeName);

        if(typeId!=0)
        {
            btnText = "修改";
        }else
        {
            btnText = "添加";
        }

        builder.setView(view)
                .setTitle("添加新聞類別")
                .setPositiveButton(btnText,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {
                                addInfoTypeOnClickListener addtype = (addInfoTypeOnClickListener)getActivity();
                                addtype.OnaddInfoTypeOnClickListener(edit_twotable_typeName.getText().toString(),typeId,postion);
                            }
                        })
                .setNegativeButton("取消",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                edit_twotable_typeName.setText("");
                            }
                        });

        return builder.show();
    }
}

8,長按item彈出操作框布局：

fragment_twotable_typeitemdialog.xml

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

    <TextView
        android:id="@+id/txt_twotable_typeitem_edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="編輯"
        android:textSize="18sp"
        android:gravity="center"
        android:padding="15dp"/>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/gray"/>
    <TextView
        android:id="@+id/txt_twotable_typeitem_delete"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="刪除"
        android:textSize="18sp"
        android:gravity="center"
        android:padding="15dp"/>
</LinearLayout>

9，長按item彈出操作框代碼：

twoTableDialogTypeItemFragment.java

package com.example.cg.greendaolearn;

import android.app.DialogFragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.TextView;

/**
 * 兩表操作 1:n，長按彈出修改與刪除按鈕
 * Created by cg on 2016/1/4.
 */
public class twoTableDialogTypeItemFragment extends DialogFragment {


    public interface txtClickListener
    {
        void OntxtClickListener(int flag,long typeId,int postion);
    }

    private long typeId;
    private int postion;

    public twoTableDialogTypeItemFragment(long typeId,int postion) {
        this.typeId = typeId;
        this.postion = postion;
    }

    private TextView txt_twotable_typeitem_edit;
    private TextView txt_twotable_typeitem_delete;

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        txt_twotable_typeitem_edit = (TextView)view.findViewById(R.id.txt_twotable_typeitem_edit);
        txt_twotable_typeitem_edit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                txtClickListener txtClick = (txtClickListener)getActivity();
                txtClick.OntxtClickListener(1,typeId,postion);
            }
        });
        txt_twotable_typeitem_delete = (TextView)view.findViewById(R.id.txt_twotable_typeitem_delete);
        txt_twotable_typeitem_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                txtClickListener txtClick = (txtClickListener)getActivity();
                txtClick.OntxtClickListener(0,typeId,postion);
            }
        });
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
        View view = inflater.inflate(R.layout.fragment_twotable_typeitemdialog,container);

        return view;
    }
}

10,子頁，信息列表布局：

activity_two_table_detail.xml

<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"
    tools:context="com.example.cg.greendaolearn.twoTableDetailActivity"
    android:orientation="vertical">

    <include
        layout="@layout/toolbar" />

    <ListView
        android:id="@+id/lv_twoTable_detail"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

11,子頁，listview中item的布局：

activty_twotable_detail_lv_item.xml

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

    <TextView
        android:id="@+id/txt_twotable_detail_item_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textColor="@color/black"/>
    <TextView
        android:id="@+id/txt_twotable_detail_item_author"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textColor="@color/black"
        android:gravity="right"/>
    <TextView
        android:id="@+id/txt_twotable_detail_item_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textColor="@color/black"/>
</LinearLayout>

12, 子頁，Adatper代碼：

twotable_info_adpter.java

package com.example.cg.greendaolearn.adpater;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.cg.greendaolearn.R;

import java.util.List;

import greendao.infos;

/**
 * 兩表操作 1:n  子表的列表Adapter
 * Created by cg on 2016/1/4.
 */
public class twotable_info_adpter extends BaseAdapter {

    private List<infos> list_info;
    private LayoutInflater inflater;

    public twotable_info_adpter(Context context,List<infos> list_info) {
        this.inflater = LayoutInflater.from(context);
        this.list_info = list_info;
    }

    @Override
    public int getCount() {
        return list_info.size();
    }

    @Override
    public Object getItem(int position) {
        return list_info.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        infoDetail iDetail;
        if(convertView==null)
        {
            iDetail = new infoDetail();
            convertView = inflater.inflate(R.layout.activty_twotable_detail_lv_item,null);
            iDetail.title = (TextView)convertView.findViewById(R.id.txt_twotable_detail_item_title);
            iDetail.author = (TextView)convertView.findViewById(R.id.txt_twotable_detail_item_author);
            iDetail.content = (TextView)convertView.findViewById(R.id.txt_twotable_detail_item_content);

            convertView.setTag(iDetail);
        }else
        {
            iDetail = (infoDetail)convertView.getTag();
        }

        iDetail.title.setText(list_info.get(position).getInfoTitle());
        iDetail.author.setText(list_info.get(position).getInfoType().getInfoName() + "-" + list_info.get(position).getInfoAuthor());
        iDetail.content.setText(list_info.get(position).getInfoContent());

        return convertView;
    }

    class infoDetail
    {
        TextView title;
        TextView author;
        TextView content;
    }
}

13, 子頁，代碼：

twoTableDetailActivity.java

package com.example.cg.greendaolearn;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;

import com.example.cg.greendaolearn.adpater.twotable_info_adpter;
import com.example.cg.greendaolearn.db.DbService;

import java.util.ArrayList;
import java.util.List;

import greendao.infos;

public class twoTableDetailActivity extends AppCompatActivity implements twoTableDetailDailogFragment.addDetailClickListener {

    private Toolbar toolbar;                                                   //定義toolbar

    private ListView lv_twoTable_detail;
    private List<infos> list_info;
    private twotable_info_adpter iAdapter;

    public long typeId;
    public String typeName;

    private DbService db;

    private twoTableDetailDailogFragment detail;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_two_table_detail);

        typeId = getIntent().getLongExtra("typeId",0);
        typeName = getIntent().getStringExtra("typeName");

        toolbar = (Toolbar)this.findViewById(R.id.toolbar);
        toolbar.setTitle(typeName);                     // 標題的文字需在setSupportActionBar之前，不然會無效
        setSupportActionBar(toolbar);



        db = DbService.getInstance(this);

        initControls();

        initData();
    }

    /**
     * 初始化數據
     */
    private void initData() {
        list_info = new ArrayList<>();
        list_info = db.getInfosByTypeId(typeId);
        iAdapter = new twotable_info_adpter(this,list_info);
        lv_twoTable_detail.setAdapter(iAdapter);
    }

    /**
     * 初始化控件
     */
    private void initControls() {
        lv_twoTable_detail = (ListView)findViewById(R.id.lv_twoTable_detail);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_two_table_detail, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.menu_twoTable_detailAddAdd) {

            detail = new twoTableDetailDailogFragment("","","",0,0);
            detail.show(getFragmentManager(),"add");
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    @Override
    public void OnaddDetailClickListener(String title, String author, String content, long infoId, int postion) {
        infos info = new infos();
        info.setInfoAuthor(author);
        info.setInfoTitle(title);
        info.setInfoContent(content);
        info.setTypeId(typeId);

        db.saveInfo(info);
        detail.dismiss();

        list_info.add(0,info);
        iAdapter.notifyDataSetChanged();
    }
}

14, 子頁，添加信息布局：

fragment_twotable_typedetaildialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="標題："
            android:gravity="center"
            android:padding="5dp"/>
        <EditText
            android:id="@+id/edit_detail_title"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/black"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="作者："
            android:gravity="center"
            android:padding="5dp"/>
        <EditText
            android:id="@+id/edit_detail_author"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/black"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="內容："
            android:gravity="center"
            android:padding="5dp"/>
        <EditText
            android:id="@+id/edit_detail_content"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:lines="3"
            android:gravity="top|left"
            android:textColor="@color/black"/>
    </LinearLayout>
</LinearLayout>

15，子頁，添加代碼

oneTableItemDialogFragment.java

package com.example.cg.greendaolearn;

import android.app.DialogFragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.TextView;

/**
 * Created by cg on 2015/12/30.
 */
public class oneTableItemDialogFragment extends DialogFragment {

    private long id;                                  //用戶id
    private int postion;                              //list中的編號
    private TextView txt_onetable_update;
    private TextView txt_onetable_delete;

    public interface EditUserOnClickListener
    {
        //flag標識,0表示刪除,1表示修改
        void onEditUserOnClick(long id,int postion,int flag);
    }

    public oneTableItemDialogFragment(long id,int postion) {
        this.id = id;
        this.postion = postion;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
        View view = inflater.inflate(R.layout.fragment_onetable_itemdialog,container);

        return view;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        txt_onetable_update = (TextView)view.findViewById(R.id.txt_onetable_update);
        txt_onetable_update.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EditUserOnClickListener listener = (EditUserOnClickListener) getActivity();
                listener.onEditUserOnClick(id,postion,1);
            }
        });
        txt_onetable_delete = (TextView)view.findViewById(R.id.txt_onetable_delete);
        txt_onetable_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EditUserOnClickListener listener = (EditUserOnClickListener) getActivity();
                listener.onEditUserOnClick(id,postion,0);
            }
        });
    }
}

本文由用戶起浮沉落自行上傳分享，僅供網友學習交流。所有權歸原作者，若您的權利被侵害，請聯系管理員。

轉載本站原創文章，請注明出處，并保留原始鏈接、圖片水印。

本站是一個以用戶分享為主的開源技術平臺，歡迎各類分享！

本文地址：http://www.baiduhome.net/lib/view/open1455271012901.html

Android開發移動開發

GreenDao的簡單使用說明(三)多表的操作1:n

相關經驗

相關資訊

相關文檔

目錄