使用 Fragments + viepage 和 recyclerView 创建 ActionBar 选项卡

Question

大家好，我是 android 的菜鸟，所以请多多包涵！

我使用下面的示例创建了一个带有四个选项卡式片段的 recyclerview，每个片段显示我正在为其创建应用程序的本地团队的列表（卡片视图）。

Recyclerview example

我想在每个片段中添加一个 onclicklistener 并尝试使用 if position 方法，就像我几年前创建类似应用程序时所做的那样，但 get position 方法已被贬值。

我知道我可以在适配器中放置 onviewbind 方法，但我被告知这不是最好的方法，（我无法让它工作）并且点击侦听器应该放置在片段中，因为这样你可以重用我想要做的适配器，因为当有人在其中一个片段中进行选择时，我想在另一个片段中创建另一个列表，然后将包含一个可扩展列表。

我的适配器

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

private String[] mDataset;

public static class MyViewHolder extends RecyclerView.ViewHolder{
    public CardView mCardView;
    public TextView mTextView;
    public MyViewHolder(View v){
        super(v);

        mCardView = (CardView) v.findViewById(R.id.card_view);
        mTextView = (TextView) v.findViewById(R.id.tv_text);

    }

}

public MyAdapter(String[] myDataset){
    mDataset = myDataset;
}

@Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_item, parent, false);
    MyViewHolder vh = new MyViewHolder(v);
    return vh;
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position){
    holder.mTextView.setText(mDataset[position]);
}

@Override
public int getItemCount() { return mDataset.length; }

我的片段

public class BlankFragment extends Fragment {

public BlankFragment() {
    // Required empty public constructor
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_blank, container, false);

    RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
    rv.setHasFixedSize(true);
    MyAdapter adapter = new MyAdapter(new String[]{"Example One", "Example Two", "Example Three", "Example Four", "Example Five" , "Example Six" , "Example Seven"});
    rv.setAdapter(adapter);

    LinearLayoutManager llm = new LinearLayoutManager(getActivity());
    rv.setLayoutManager(llm);

    return rootView;
}

}

我已经尝试了各种方法来使其正常工作，但我一直面临错误或贬值的代码。

任何人都可以将我链接到教程吗？这将帮助我或帮助我使用一些代码来解决这个问题！提前致谢

Answer 1

您可以在适配器中创建一个接口，如 onItemClickedListener，使用方法 onItemClicked(int position) 和适配器中的公共方法 setOnItemClickListener 来初始化适配器中的 onItemClickedListener 实例，从片段和 onBindViewHolder添加setOnClickListener，检查onItemClickListener是否不为空，然后调用方法onItemClicked(int position)，你的代码会是这样的

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private String[] mDataset;

    private onItemClickListener onItemClickListener;

    interface onItemClickListener{
        void onItemClicked(int position)
    }

    public void setOnItemClickListener(onItemClickListener 
    onItemClickListener){
        this.onItemClickListener = onItemClickListener;
    }

    public static class MyViewHolder extends RecyclerView.ViewHolder{
        public CardView mCardView;
        public TextView mTextView;

        public MyViewHolder(View v){
            super(v);

            mCardView = (CardView) v.findViewById(R.id.card_view);
            mTextView = (TextView) v.findViewById(R.id.tv_text);

        }

    }

    public MyAdapter(String[] myDataset){
        mDataset = myDataset;
    }

    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_item, parent, false);
        MyViewHolder vh = new MyViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position){
        holder.mTextView.setText(mDataset[position]);
        holder.mTextView.setOnClickListener(new View.OnClickListener(){
            @Override
                public void onClick(View v) {
                    if (onItemClickListener != null) {
                        onItemClickListener.onItemClicked(position);
                    }
                }
        });
    }

    @Override
    public int getItemCount() { return mDataset.length; }

    }

你的片段看起来像

public class BlankFragment extends Fragment {

public BlankFragment() {
    // Required empty public constructor
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_blank, container, false);

    RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
    rv.setHasFixedSize(true);
    MyAdapter adapter = new MyAdapter(new String[]{"Example One", "Example Two", "Example Three", "Example Four", "Example Five" , "Example Six" , "Example Seven"});
    rv.setAdapter(adapter);
    adapter.setOnItemClickListener(new MyAdapter.onItemClickListener){
             @Override
            public void onItemClicked(int pos) {
         // DO here what you want ot do on item clicked
            }
    });
    LinearLayoutManager llm = new LinearLayoutManager(getActivity());
    rv.setLayoutManager(llm);

    return rootView;
}
}