MVVM 模式初体验

1.使layout 绑定databinding

image.png

2.创建ViewModel （这里使用的使rxjava+retrofit）

public class Bang_Meau_Vm extends ViewModel {
    public MutableLiveData> Bang_Music_list=new MutableLiveData<>();

    public void Get_Bang_Music_list(Context context , String bangId,String pn,String rn,String reqId){
        Api.getInstance().iRetrofit.Bang_Music_list(bangId,pn,rn,reqId).compose(ApiSubscribe.>io_main())
                .subscribe(new ApiResponse>(context) {
                    @Override
                    public void success(BaseRespon data) {
                        Bang_Music_list.setValue(data);
                    }
                });
    }
}

3.在activity或者frament中的使用

 private Bang_Meau_Vm bang_meau_vm;
 bang_meau_vm = ViewModelProviders.of(this).get(Bang_Meau_Vm.class);

4.databinding在activity 和frment以及自定义view中的使用
activity:

private BangMeauActivityBinding bangMeauActivityBinding;
bangMeauActivityBinding = DataBindingUtil.setContentView(this, R.layout.bang_meau_activity);

frament:

 private Frament_Rec_VM framentRecVM;
    private FramentRecBinding framentRecBinding;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        framentRecBinding= DataBindingUtil.inflate(inflater,R.layout.frament_rec,container,false);
        framentRecVM = ViewModelProviders.of(this).get(Frament_Rec_VM.class);
        StatusBarUtil.setTranslucentForImageViewInFragment(getActivity(),0, null);
        setVM();
        initdata();
        return framentRecBinding.getRoot();
    }

自定义view中:

 custombannerBinding= DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.custombanner,
                this,true);

5.在recycleview 中的adapter中的使用

通用的viewholder

public class BindingViewHolder  extends RecyclerView.ViewHolder {
    private T mBinding;
    public BindingViewHolder(@NonNull T binding) {
        super(binding.getRoot());
        mBinding = binding;
    }
    public T getBinding() {
        return mBinding;
    }
}

public class Bang_Meau_ItemApt extends RecyclerView.Adapter {
    private Context context;
    private List musicListBeans;
    private  BangMeauItemaptBinding bangMeauItemaptBinding;
    private Bang_Meau_ItemApt.OnItemClick onItemClick;

    public  Bang_Meau_ItemApt(Context context, List musicListBeans){
        this.context=context;
        this.musicListBeans=musicListBeans;
    }
    @NonNull
    @Override
    public BindingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
         bangMeauItemaptBinding= DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.bang_meau_itemapt,parent,false);
        return new BindingViewHolder(bangMeauItemaptBinding);
    }

    @Override
    public void onBindViewHolder(@NonNull BindingViewHolder holder, final int position) {
        ViewDataBinding binding = holder.getBinding();
        binding.setVariable(BR.bangmeauitem,musicListBeans.get(position));
        bangMeauItemaptBinding.tvBangMeauItemPos.setText(String.valueOf(position+1));
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onItemClick.OnItemClickListener(position);
            }
        });
    }

    @Override
    public int getItemCount() {
        return 5;
    }

    //ItemView 的点击接口
    public interface OnItemClick{
        void OnItemClickListener(int pos);
    }
    public void setOnItemClick(Bang_Meau_ItemApt.OnItemClick click){
        this.onItemClick=click;
    }
}

在grideview中使用

public class Gv_artist_albums_apt extends BaseAdapter {
    private Context context;
    private List artist_albums;
    public Gv_artist_albums_apt(Context context, List artist_albums){
        this.artist_albums=artist_albums;
        this.context=context;
    }
    @Override
    public int getCount() {
        return artist_albums.size();
    }

    @Override
    public Object getItem(int i) {
        return artist_albums.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        GvArtistAlbumsAptBinding gvArtistAlbumsAptBinding= DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.gv_artist_albums_apt,viewGroup,false);
        gvArtistAlbumsAptBinding.setVariable(BR.artistalbums, artist_albums.get(i));
        return gvArtistAlbumsAptBinding.getRoot();
    }
}