GreenDao使用说明(三)多表的使用

我们在使用数据库的时候，大多数都会是多表联合操作，不会只有一个表的，下面我们就来说一下，多表的操作，这里先拿1：n来说。这是我们平时在设计数据库时最常用的模式。下面我来看一下，GreenDao对1:n的模式是怎么处理的。

一，我们先要新建两个表，用来实现1：n。我们先来修改MyDaoGenerator.Java这个文件。代码如下：

[java] view plain copy

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");
//上面是我们用于单表操作的时建立的表
//下面是我们要建的两个新表，一个上信息类别，一个是信自，它们的关系是1:n.
//对于信息类别表，没有什么好说的，和上面一样，直接建立一个表就完了，我们主要来看一下信息表中，如何设置外键
Entity infoTypeBean = schema.addEntity("infoType");
//此处是用来实现序列化的接口
infoTypeBean.implementsSerializable();
infoTypeBean.addIdProperty();
infoTypeBean.addStringProperty("infoName");
//信息表进行建立
Entity infoBean = schema.addEntity("infos");
infoBean.implementsSerializable();
infoBean.addIdProperty();
infoBean.addStringProperty("infoTitle");
infoBean.addStringProperty("infoAuthor");
infoBean.addStringProperty("infoContent");
//这里我们为信息表，添加一个typeId外键，它就是infoType表的id
Property typeId = infoBean.addLongProperty("typeId").getProperty();
//这里是重点，我们为这两个表建立1:n的关系，并设置关联字段。
infoBean.addToOne(infoTypeBean, typeId);
ToMany addToMany = infoTypeBean.addToMany(infoBean,typeId);
addToMany.setName("infoes");
new DaoGenerator().generateAll(schema, args[0]);
}
}

我在代码中加了比较详细的注解，相信大家一看就明白了。

注意：

Schema schema = new Schema(3, "greendao");这里的版本号，你要比之前的版本号大1,原来咱们是1，我这里是3，是因为我当时写代码的时候，写错了一个地方，没法子，就又升了一次。哈哈。。。。。。。。

二，修改我们封装的DaoMaster.OpenHelper代码，让他进行升级，代码如下

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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;
/**
* 封装DaoMaster.OpenHelper方法, 在更新的时候,用来保存原来的数据
* greenDao默认在更新的时候,会新建表,原来的数据就丢失了
* 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:
//创建新表，注意createTable()是静态方法
infosDao.createTable(db, true);
infoTypeDao.createTable(db,true);
// 加入新字段
// db.execSQL("ALTER TABLE 'moments' ADD 'audio_path' TEXT;");
// TODO
break;
}
}
}

这里我们修改就是onUpgrade方法，在这里添加了创建新表的方法，在这里我多说一句，就是GreenDao在修改原表的时候，它会把原表删除，这样就会有一个问题，你原有的数据会丢，这样，我们就要在这里处理一下，把原表数据存入临时表中，然后再删除，最后把数据再导回来。

三，生成建表，我们运行代码，来看一下生成后的效果

这里有时候，我们在运行MyDaoGenerator.java代码，生成类的时候，会提示GKB代码无法运行，这是因为你在这个文件里写了中文，它不认，就算是你把这个文件转成了utf-8，也会报这个错，这时候，我们只能用记事本打开这个文件，然后覆盖保存，在保存时，编码选择 ANSI。就ok了，下面我们看一下，生成的文件列表

这样，我们的新建的两个表的bean和操作dao文件都已经生成好了。我们就可以进行后面的，增，删，改，查工作了。

四，查看生成的bean文件

我们来看一下这里生成的infos.java和infoType.java两个文件有什么特别之后。我们先来看一下infoType.java代码，处了代码被序列化外，我们发现里面多了一些方法，这里主要说一下与1：N关联有关的方法

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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;
}

这个方法，一看名字就知道，这是得到信息列表的，也就是说，我们在得到一个信息分类的同时，只要点一下这个方法，你就可以同时得到此分类下所有的信息，这对于信息量比较少的操作来说，是相当方便的方法。但是对于大数据量来说，就没有什么意义了。因为List这个分页处理不行，你可能会说，我直接修改它的代码不就完了吗，这个可行，可是GreenDao给出的说明是这个类，最好不要进行修改。

它里面其它的方法，update,delete个人感觉没什么意义，我一直开始以为，它会产生联动的效果，就是删除这个分类的时候，子信息也会被删除，可是却没有发生。

我们再来看一下infos.java里面的代码

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

这个个人感觉相当使用，就是我们在得到条信息的时候，可以同时取得它的分类信息。这个在显示详细信息的时候相当有用啊。

下面我写的一些代码片断，就是两个页，一个显示信息分类，点击信息分类，显示此分类下所有的信息。信息分类和信息的添加，依然采用，toolbar的menu，修改与删除功能，是长按listView。下面我把代码放出来：

1, DbService.java添加对两个新类的操作方法

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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;
/**
* 用户操作类
* 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() {
}
/**
* 采用单例模式
* @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;
}
/**
* 根据用户id,取出用户信息
* @param id 用户id
* @return 用户信息
*/
public Users loadNote(long id) {
if(!TextUtils.isEmpty(id + "")) {
return userDao.load(id);
}
return null;
}
/**
* 取出所有数据
* @return 所有数据信息
*/
public List<Users> loadAllNote(){
return userDao.loadAll();
}
/**
* 生成按id倒排序的列表
* @return 倒排数据
*/
public List<Users> loadAllNoteByOrder()
{
return userDao.queryBuilder().orderDesc(UsersDao.Properties.Id).list();
}
/**
* 根据查询条件,返回数据列表
* @param where 条件
* @param params 参数
* @return 数据列表
*/
public List<Users> queryNote(String where, String... params){
return userDao.queryRaw(where, params);
}
/**
* 根据用户信息,插件或修改信息
* @param user 用户信息
* @return 插件或修改的用户id
*/
public long saveNote(Users user){
return userDao.insertOrReplace(user);
}
/**
* 批量插入或修改用户信息
* @param list 用户信息列表
*/
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);
}
}
});
}
/**
* 删除所有数据
*/
public void deleteAllNote(){
userDao.deleteAll();
}
/**
* 根据id,删除数据
* @param id 用户id
*/
public void deleteNote(long id){
userDao.deleteByKey(id);
Log.i(TAG, "delete");
}
/**
* 根据用户类,删除信息
* @param user 用户信息类
*/
public void deleteNote(Users user){
userDao.delete(user);
}
/**********************信息类别*********************************/
/**
* 添加或修改信息类别
* @param iType 信息类别
* @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);
}
/**
* 根据类别id,删除信息类别
* @param id 信息id
*/
public void deleteInfoType(long id)
{
typeDao.load(id).delete();
}
/**
* 按id倒排序,来显示所信息类别
* @return 信息类别列表
*/
public List<infoType> getAllInfoTypeList()
{
return typeDao.queryBuilder().orderDesc(infoTypeDao.Properties.Id).list();
}
/**
* 根据类别id,取出类别信息
* @param id
* @return
*/
public infoType getInfoType(long id)
{
return typeDao.load(id);
}
/**********************信息列表*********************************/
/**
* 根据信息类别id,取出其类别下所有的信息
* @param typeid 类别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);
}
/**
* 返回所有新闻,用于测试类别删除的同步性
* @return 返回所有新闻
*/
public List<infos> getAllInfos()
{
return infoDao.loadAll();
}
/**
* 分页显示信息
* @param typeid 信息类别
* @param pageNum 当前页数
* @param pageSize 每页显示数
* @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, 分类信息页面布局代码：

activity_two_table.xml

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<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, 分类信息页面中listView的item布局：

activity_twotable_lv_item.xml

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<?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代码：

twotable_type_adpter.java

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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;
/**
* 两表间，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, 信息列表程序代码：

twoTableActivity.java

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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; //定义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"); // 标题的文字需在setSupportActionBar之前，不然会无效
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);
}
});
/**
* 长按事件
*/
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, "数据修改失败！", 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：删除 1：修改
if(flag==0)
{
db.deleteInfoType(typeId);
list_type.remove(postion);
tAdapter.notifyDataSetChanged();
Toast.makeText(this,"删除成功！",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，点击add按钮弹出框布局：

fragment_onetable_dialog.xml

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<?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="新闻类别："
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，点击add按钮弹出框代码：

twoTableDialogTypeFragment.java

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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;
/**
* 两表操作，1:n 新闻类别添加弹出框
* 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("添加新闻类别")
.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,长按item弹出操作框布局：

fragment_twotable_typeitemdialog.xml

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<?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="编辑"
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="删除"
android:textSize="18sp"
android:gravity="center"
android:padding="15dp"/>
</LinearLayout>

9，长按item弹出操作框代码：

twoTableDialogTypeItemFragment.java

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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;
/**
* 两表操作 1:n，长按弹出修改与删除按钮
* 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,子页，信息列表布局：

activity_two_table_detail.xml

[html] view plain copy

<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,子页，listview中item的布局：

activty_twotable_detail_lv_item.xml

[html] view plain copy

<?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, 子页，Adatper代码：

twotable_info_adpter.java

[java] view plain copy

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;
/**
* 两表操作 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, 子页，代码：

twoTableDetailActivity.java

[java] view plain copy

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; //定义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); // 标题的文字需在setSupportActionBar之前，不然会无效
setSupportActionBar(toolbar);
db = DbService.getInstance(this);
initControls();
initData();
}
/**
* 初始化数据
*/
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, 子页，添加信息布局：

fragment_twotable_typedetaildialog.xml

[html] view plain copy

<?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="标题："
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="内容："
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，子页，添加代码

oneTableItemDialogFragment.java

[java] view plain copy

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; //用户id
private int postion; //list中的编号
private TextView txt_onetable_update;
private TextView txt_onetable_delete;
public interface EditUserOnClickListener
{
//flag标识,0表示删除,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);
}
});
}
}

GreenDao使用说明(三)多表的使用

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