显示非活动类的吐司

如何解决显示非活动类的吐司

我想显示非活动类的敬酒，这是我的RecyclerView适配器。

我该怎么做？

我想在onLoadingStateChanged() switch语句中设置烤面包。

我尝试了一些旧代码，但似乎不起作用。

我不希望RecylerView适配器进入MainActivity

我的适配器活动：

public class TalesAdapter extends FirestorePagingAdapter<TalesDetails,TalesAdapter.TalesViewHolder> {

    public TalesAdapter(@NonNull FirestorePagingOptions<TalesDetails> options) {
        super(options);
    }



    @Override
    protected void onBindViewHolder(@NonNull TalesViewHolder holder,int position,@NonNull TalesDetails model) {
        holder.bind(model);

    }

    @NonNull
    @Override
    public TalesViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.talesrecyclerview,parent,false);
        return new TalesViewHolder(view);
    }
   

    @Override

    protected void onLoadingStateChanged(@NonNull LoadingState state) {
        switch (state) {
            case LOADING_INITIAL:
            case LOADING_MORE:
             //toast here
                break;

            case LOADED:
             //toast here
            case FINISHED:
             //toast here
                break;

            case ERROR:
             //toast here

                break;
        }

    }

    public class TalesViewHolder extends RecyclerView.ViewHolder  {

        private TextView Title;
        private TextView Matter;
        private TextView Name;

        public TalesViewHolder(View itemView ) {
            super(itemView);
            Name = itemView.findViewById(R.id.tvName);
            Title = itemView.findViewById(R.id.tvTitle);
            Matter = itemView.findViewById(R.id.tvMatter);
        }

        public void bind(TalesDetails tales){
            Name.setText(tales.name);
            Title.setText(tales.title);
            Matter.setText(tales.matter);

        }
    }
}

解决方法

您有两种可能：

1-创建Context变量

private Context context;

public TalesViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        context = parent.getContext();

        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.talesrecyclerview,parent,false);
        return new TalesViewHolder(view);
    }

2-使用implementation 'com.blankj:utilcodex:1.29.0'

ToastUtils.showShort("YOUR TEXT HERE");

,

声明YourActivity类的变量类型，并在构造TalesAdapter时传递活动引用

public class TalesAdapter extends FirestorePagingAdapter<TalesDetails,TalesAdapter.TalesViewHolder> {
Context mContext = null;

    public TalesAdapter(@NonNull FirestorePagingOptions<TalesDetails> options,Context mContext) {
        this.mContext = mContext;
        super(options);
    }
@Override

    protected void onLoadingStateChanged(@NonNull LoadingState state) {
        switch (state) {
            case LOADING_INITIAL:
            case LOADING_MORE:
             Toast.makeText(mContext,"your message",Toast.LENGTH_SHORT).show()
                break;

            case LOADED:
             //toast here
            case FINISHED:
             //toast here
                break;

            case ERROR:
             //toast here

                break;
        }

    }



}

,

您可以在适配器中创建构造函数 喜欢：

Context mContext;

public TalesAdapter(@NonNull FirestorePagingOptions<TalesDetails> options,Context mContext) {
        this.mContext = mContext;
        super(options);
    }



@Override   
    protected void onLoadingStateChanged(@NonNull LoadingState state) {
        switch (state) {
            case LOADING_INITIAL:
            case LOADING_MORE:
             Toast.makeText(mContext,"Taost",Toast.LENGTH_SHORT).show();
                break;
            case LOADED:
             Toast.makeText(mContext,Toast.LENGTH_SHORT).show();
              break;
            case FINISHED:
             Toast.makeText(mContext,Toast.LENGTH_SHORT).show();
                break;
            case ERROR:
             Toast.makeText(mContext,Toast.LENGTH_SHORT).show();
                break;
        }

    }

在您的活动中，无论是MainActivity.java还是该适配器在RecyclerView或ListView中的任何时间

Context mContext = this;
adapter = new TalesAdapter(mContext);
mRecycler.setAdapter(adapter)