Android|Android MVVM架构实现RecyclerView列表详解流程 AndroidMVVM架构实现RecyclerView列表

效果图
导入引用

导入Recyclerview依赖
导入dataBinding引用

代码解析

建立实体类
建立RecyclerView子项
适配器

建立适配器
设置子项点击事件
adapter全部代码

建立VM层

子项点击事件的使用
VM层代码

数据与视图交互

效果图

Android|Android MVVM架构实现RecyclerView列表详解流程

文章图片

导入引用
导入Recyclerview依赖

implementation 'androidx.recyclerview:recyclerview:1.1.0'

导入dataBinding引用

dataBinding {enabled = true}

【Android|Android MVVM架构实现RecyclerView列表详解流程】
代码解析
建立实体类

继承被观察者模式BaseObservable

@Bindable绑定字段

刷新数据 notifyPropertyChanged( BR.mName ); //BR自动生成

public class Information extends BaseObservable {public String mName; public String mSex; public String mAge; public List informationList; public Information(){}public Information(String mName,String mSex,String mAge){this.mName = mName; this.mSex = mSex; this.mAge = mAge; }@Bindablepublic String getmAge() {return mAge; }@Bindablepublic String getmName() {return mName; }@Bindablepublic String getmSex() {return mSex; }/*** @param mName*/public void setmName(String mName) {this.mName = mName; notifyPropertyChanged( BR.mName ); }@Bindablepublic List getInformationList() {return informationList; }/*** @param mSex */public void setmSex(String mSex) {this.mSex = mSex; notifyPropertyChanged( BR.mSex ); }/*** @param mAge */public void setmAge(String mAge) {this.mAge = mAge; notifyPropertyChanged( BR.mAge ); }/*** @param informationList */public void setInformationList(List informationList) {this.informationList = informationList; notifyPropertyChanged( BR.informationList ); }}

将视图层与数据层绑定

@{information.mName}

建立RecyclerView子项
导入实体类

适配器

建立适配器引入数据源

public MyRecyclerView(List informationList){this.informationList = informationList; }

插入布局文件

@NonNull@Overridepublic ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {ViewDataBinding binding = DataBindingUtil.inflate( LayoutInflater.from( parent.getContext()) , R.layout.recyclerview_item,parent,false); return new ViewHolder( binding,mOnItemClickListener ); }

设置数据

@Overridepublic void onBindViewHolder(@NonNull ViewHolder holder, int position) {Information information = informationList.get( position ); holder.binding.setVariable( BR.information,informationList.get( position )); holder.binding.executePendingBindings(); }

自定义ViewHolder类

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ViewDataBinding binding = null; OnItemClickListener listener; public ViewHolder(@NonNull ViewDataBinding binding,OnItemClickListener listener) {super( binding.getRoot() ); this.listener = listener; this.binding = binding; binding.getRoot().setOnClickListener( this ); }public ViewDataBinding getBinding(){return binding; }

设置子项点击事件定义接口

public interface OnItemClickListener {void onItemClick(View view, int position); }

继承View.OnClickListener点击事件

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener

获取接口实例

public ViewHolder(@NonNull ViewDataBinding binding,OnItemClickListener listener)

调用接口

@Overridepublic void onClick(View v) {if (listener != null){listener.onItemClick( v,getPosition() ); }}

开放接口

public void setOnItemClickListener(OnItemClickListener listener) {this.mOnItemClickListener = listener; }

adapter全部代码

public class MyRecyclerView extends RecyclerView.Adapter{private List informationList; private OnItemClickListener mOnItemClickListener; public MyRecyclerView(List informationList){this.informationList = informationList; }public interface OnItemClickListener {void onItemClick(View view, int position); }public void setOnItemClickListener(OnItemClickListener listener) {this.mOnItemClickListener = listener; }@NonNull@Overridepublic ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {ViewDataBinding binding = DataBindingUtil.inflate( LayoutInflater.from( parent.getContext()) , R.layout.recyclerview_item,parent,false); return new ViewHolder( binding,mOnItemClickListener ); }@Overridepublic void onBindViewHolder(@NonNull ViewHolder holder, int position) {Information information = informationList.get( position ); holder.binding.setVariable( BR.information,informationList.get( position )); holder.binding.executePendingBindings(); }@Overridepublic int getItemCount() {return informationList.size(); }class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ViewDataBinding binding = null; OnItemClickListener listener; public ViewHolder(@NonNull ViewDataBinding binding,OnItemClickListener listener) {super( binding.getRoot() ); this.listener = listener; this.binding = binding; binding.getRoot().setOnClickListener( this ); }public ViewDataBinding getBinding(){return binding; }@Overridepublic void onClick(View v) {if (listener != null){listener.onItemClick( v,getPosition() ); }}}}

建立VM层

子项点击事件的使用实现OnItemClickListener接口

@Overridepublic void InitListener(){adapter.setOnItemClickListener( new MyRecyclerView.OnItemClickListener() {@Overridepublic void onItemClick(View view, int position) {Toast.makeText( context,"位数："+position,Toast.LENGTH_SHORT ).show(); }} ); }

VM层代码

public class ViewModel implements IViewModel{public Information information; public List mList = new ArrayList<>(); private RecyclerView recyclerView; private Context context; private MyRecyclerView adapter; public ViewModel(Information information, RecyclerView recyclerView, Context context){this.information = information; this.recyclerView = recyclerView; this.context = context; InitRecyclerView(); InitData(); InitListener(); }private void InitRecyclerView(){recyclerView.setLayoutManager( new LinearLayoutManager( context ) ); adapter = new MyRecyclerView( mList ); recyclerView.setAdapter( adapter ); }@Overridepublic void InitData() {for (int i = 0; i < 10; i++) {mList.add( new Information( "张三"+i,"男",i+"" ) ); Log.d( "TAG",mList.get( i ).mName+"" ); }information.setInformationList( mList ); }@Overridepublic void InitListener(){adapter.setOnItemClickListener( new MyRecyclerView.OnItemClickListener() {@Overridepublic void onItemClick(View view, int position) {Toast.makeText( context,"位数："+position,Toast.LENGTH_SHORT ).show(); }} ); }}

数据与视图交互

public class MainActivity extends AppCompatActivity {private ActivityMainBinding binding; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate( savedInstanceState ); binding = DataBindingUtil.setContentView( this,R.layout.activity_main ); binding.setViewmodel( new ViewModel(new Information(),binding.myRecyclerView,MainActivity.this) ); }}

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