效果图
导入引用
导入Recyclerview依赖
implementation 'androidx.recyclerview:recyclerview:1.1.0'
导入dataBinding引用
dataBinding {
enabled = true
}
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;
}
@Bindable
public String getmAge() {
return mAge;
}
@Bindable
public String getmName() {
return mName;
}
@Bindable
public String getmSex() {
return mSex;
}
/**
* @param mName*/
public void setmName(String mName) {
this.mName = mName;
notifyPropertyChanged( BR.mName );
}
@Bindable
public 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(ListinformationList){ this.informationList = informationList; }
插入布局文件
@NonNull
@Override
public 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
@Override
public 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
@Override
public 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 @Override public 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 ); } @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { Information information = informationList.get( position ); holder.binding.setVariable( BR.information,informationList.get( position )); holder.binding.executePendingBindings(); } @Override public 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; } @Override public 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
@Override
public void InitListener(){
adapter.setOnItemClickListener( new MyRecyclerView.OnItemClickListener() {
@Override
public 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 );
}
@Override
public 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 );
}
@Override
public void InitListener(){
adapter.setOnItemClickListener( new MyRecyclerView.OnItemClickListener() {
@Override
public 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;
@Override
protected 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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