- 一个好用的依赖注入框架ButterKnife
- 一个ORM框架GreenDao
- 一个快速强大的recycler帮助框架BaseRecyclerViewAdapterHelper
在gradle中添加
apply plugin: 'com.jakewharton.butterknife' dependencies { compile 'com.jakewharton:butterknife:8.4.0' annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0' }在root中添加
buildscript { repositories { mavenCentral() } dependencies { classpath 'com.jakewharton:butterknife-gradle-plugin:8.4.0' } }
private EditText username;
username = findViewById(R.id.user);
@BindView(R.id.user) EditText username;
@OnClick(R.id.home_add)
void add() {
Intent intent = new Intent(this,EditNoteActivity.class);
startActivityForResult(intent,REQUEST_EDIT);
}
greenDAO is a light & fast ORM for Android that maps objects to SQLite databases. Being highly optimized for Android, greenDAO offers great performance and consumes minimal memory.
greenDAO是一个将对象映射到SQLite数据库的轻量、快速的ORM框架。对Android高度优化，greenDAO拥有高性能低内存消耗。
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1'
}
}
apply plugin: 'org.greenrobot.greendao'
dependencies {
compile 'org.greenrobot:greendao:3.2.0'
}
@Entity
public class Note {
@Id
private Long id;
private Long addTime;
private String title;
private String content;
}
@Entity
public class Note {
@Id
private Long id;
private Long addTime;
private String title;
private String content;
@Generated(hash = 128193520)
public Note(Long id, Long addTime, String title, String content) {
this.id = id;
this.addTime = addTime;
this.title = title;
this.content = content;
}
@Generated(hash = 1272611929)
public Note() {
}
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public Long getAddTime() {
return this.addTime;
}
public void setAddTime(Long addTime) {
this.addTime = addTime;
}
public String getTitle() {
return this.title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return this.content;
}
public void setContent(String content) {
this.content = content;
}
}
//获取一个Session对象，即和数据库的连接。
DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(context, "note.db", null);
DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDb());
daoSession = daoMaster.newSession();
//获取NoteDao，就可以直接对NoteDao进行增删改查操作了。
NoteDao mNoteDao = daoSession.getNoteDao();
//查询Note，按addtime降序查询。
List<Note> list = mNoteDao.queryBuilder().offset(index*size).limit(size).orderDesc(NoteDao.Properties.AddTime).list();
其他相关操作可以查看 greenDao的文档
- 优化Adapter代码
- 添加Item事件
- 添加列表加载动画
- 添加头部、尾部
- 上拉加载
- 添加分组
- 自定义不同的item类型
- 设置空布局
- 添加拖拽、滑动删除
- 分组的伸缩栏
- 自定义ViewHolder
allprojects { repositories { ... maven { url "https://jitpack.io" } } }dependencies { compile 'com.github.CymChad:BaseRecyclerViewAdapterHelper:VERSION_CODE' }
使用方法可以查看代码，或者查看他们的 文档
我这里主要采用了MVP模式，类比较多，直放上个别代码，具体看这里。
public interface HomeContract {
interface View {
/**
* 设置SwipeRefreshLayout的刷新动画显示
* @param isShow 是否显示
*/
void showSwipe(boolean isShow);
/**
* 获取Note成功
* @param notes note列表
*/
void getNoteSuccess(List<Note> notes);
/**
* 加载更多note成功
* @param notes note列表
*/
void loadMoreNoteSuccess(List<Note> notes);
/**
* 列表到底
* @param canLoad 能否加载更多
*/
void loadEnd(boolean canLoad);
}
interface Presenter {
/**
* 刷新note列表
*/
void refreshNote();
/**
* 初始化方法
*/
void start();
/**
* 加载更多note
*/
void loadMoreNote();
/**
* 删除note
* @param id note id
*/
void removeNote(Long id);
}
}
public class HomePresenter implements HomeContract.Presenter {
private Context context;
/**
* view 控制视图
*/
private HomeContract.View mView;
/**
* 分页的当前页
*/
private int index = 0;
/**
* 每页的数量
*/
private int size = 8;
/**
* 是否到底
*/
private boolean isEnd = false;
/**
* 加载线程
*/
private static Handler handler = new Handler();
/**
* 用来操作数据库的对象
*/
private NoteDao mNoteDao;
public HomePresenter(Context context, HomeContract.View mView) {
this.context = context;
this.mView = mView;
//初始化NoteDao
mNoteDao = DAO.getInstance(context).getSession().getNoteDao();
}
@Override
public void refreshNote() {
//刷新重置页面
index = 0;
isEnd = false;
//开启刷新动画
mView.showSwipe(true);
//延时1秒执行查询并传送数据到view中
handler.postDelayed(new Runnable() {
@Override
public void run() {
List<Note> list = mNoteDao.queryBuilder().offset(index*size).limit(size).orderDesc(NoteDao.Properties.AddTime).list();
mView.getNoteSuccess(list);
//关闭刷新动画
mView.showSwipe(false);
}
},1000);
}
@Override
public void start() {
refreshNote();
}
@Override
public void loadMoreNote() {
//如果到底则不加载
if(isEnd) return;
//延时1秒执行查询并传送数据到view中
handler.postDelayed(new Runnable() {
@Override
public void run() {
//查询
List<Note> list = mNoteDao.queryBuilder().offset((++index)*size).limit(size).orderDesc(NoteDao.Properties.AddTime).list();
//传送数据到view中
mView.loadMoreNoteSuccess(list);
//如果查询结果小于每页数量，则到底，告诉view不能加载了。
if(list.size()<size) {
isEnd = true;
mView.loadEnd(!isEnd);
}
}
},1000);
}
@Override
public void removeNote(Long id) {
//根据id删除note
mNoteDao.deleteByKey(id);
}
}
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener,
HomeContract.View{
/**
* 编辑或添加的activity的请求flag
*/
public final static int REQUEST_EDIT = 1000;
/**
* 绑定recyclerview
*/
@BindView(R.id.home_recycler)
RecyclerView recyclerView;
/**
* 绑定添加按钮
*/
@BindView(R.id.home_add)
Button addButton;
/**
* 绑定SwipeRefreshLayout，下拉刷新控件
*/
@BindView(R.id.home_swipe)
SwipeRefreshLayout swipeRefreshLayout;
/**
* 声明Presenter
*/
private HomeContract.Presenter mPresenter;
/**
* recycler的adapter
*/
private Adapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//初始化presenter
mPresenter = new HomePresenter(this,this);
setContentView(R.layout.activity_main);
//绑定控件
ButterKnife.bind(this);
//绑定刷新监听
swipeRefreshLayout.setOnRefreshListener(this);
initRecyclerView();
mPresenter.start();
}
private void initRecyclerView() {
//设置recyclerview的layoutManager
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//初始化adapter
mAdapter = new Adapter(this,null);
recyclerView.setAdapter(mAdapter);
//设置加载更多监听
mAdapter.setOnLoadMoreListener(new BaseQuickAdapter.RequestLoadMoreListener() {
@Override
public void onLoadMoreRequested() {
//加载更多
mPresenter.loadMoreNote();
}
});
//设置侧滑、拖拽
ItemDragAndSwipeCallback itemDragAndSwipeCallback = new ItemDragAndSwipeCallback(mAdapter);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(itemDragAndSwipeCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
mAdapter.enableSwipeItem();
//初始化侧滑监听
OnItemSwipeListener onItemSwipeListener = new OnItemSwipeListener() {
@Override
public void onItemSwipeStart(RecyclerView.ViewHolder viewHolder, int pos) {}
@Override
public void clearView(RecyclerView.ViewHolder viewHolder, int pos) {}
@Override
public void onItemSwiped(RecyclerView.ViewHolder viewHolder, int pos) {
//删除note
mPresenter.removeNote(mAdapter.getItem(pos).getId());
}
@Override
public void onItemSwipeMoving(Canvas canvas, RecyclerView.ViewHolder viewHolder, float v, float v1, boolean b) {
}
};
//绑定侧滑监听
mAdapter.setOnItemSwipeListener(onItemSwipeListener);
//添加点击监听
recyclerView.addOnItemTouchListener(new OnItemClickListener() {
@Override
public void onSimpleItemClick(BaseQuickAdapter baseQuickAdapter, View view, int i) {
//把note的id传入intent，启动编辑的activity
Note note = (Note) baseQuickAdapter.getItem(i);
Intent intent = new Intent(getApplicationContext(),EditNoteActivity.class);
intent.putExtra("id",note.getId());
startActivityForResult(intent,REQUEST_EDIT);
}
});
}
//绑定添加按钮的监听
@OnClick(R.id.home_add)
void add() {
Intent intent = new Intent(this,EditNoteActivity.class);
startActivityForResult(intent,REQUEST_EDIT);
}
@Override
public void onRefresh() {
mPresenter.refreshNote();
}
@Override
public void showSwipe(boolean isShow) {
//设置刷新动画是否开启
swipeRefreshLayout.setRefreshing(isShow);
}
@Override
public void getNoteSuccess(List<Note> notes) {
//重新设置新的数据并刷新
mAdapter.setNewData(notes);
}
@Override
public void loadMoreNoteSuccess(List<Note> notes) {
//加入更多数据
mAdapter.addData(notes);
mAdapter.loadMoreComplete();
}
@Override
public void loadEnd(boolean canLoad) {
if(canLoad) {
}else {
// mAdapter.setEnableLoadMore(canLoad);
//显示没有更多数据
mAdapter.loadMoreEnd();
}
}
/**
* BaseItemDraggableAdapter是一个可以拖拽的适配器，如果不需要可以继承BaseQuickAdapter。
*/
private class Adapter extends BaseItemDraggableAdapter<Note,BaseViewHolder> {
private Context context;
public Adapter(Context context,List<Note> data) {
//传入布局
super(R.layout.home_note_item, data);
this.context = context;
}
@Override
protected void convert(BaseViewHolder baseViewHolder, final Note note) {
//设置标题
baseViewHolder.setText(R.id.home_note_item_title,note.getTitle());
//设置内容
baseViewHolder.setText(R.id.home_note_item_content,note.getContent());
//设置时间
java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = new Date(note.getAddTime());
baseViewHolder.setText(R.id.home_note_item_time,formatter.format(date));
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//请求编辑并且返回成功则刷新note列表
if(requestCode == REQUEST_EDIT && resultCode == RESULT_OK) {
mPresenter.refreshNote();
}
}
}