java - 让提交按钮适用于 recyclerview 适配器和主要 Activity 中的 edittext

Question

我正在使用 Java + RecyclerView + CardView 开发一个小型 Android 应用程序

回收器 View 工作正常但是......

我希望卡中的提交按钮从同一张卡中的 Edittext 字段获取文本并将其分配给变量。

我希望监听器像我一样是按钮的，而不是编辑文本的。

如果我要求它执行其他操作，该按钮可以正常工作，我相信问题在于从同一张卡中的 Edittext 中检索文本。

有谁知道怎么解决吗？

谢谢

我的适配器:

public class ExerciseAdapter extends RecyclerView.Adapter<ExerciseAdapter.ExerciseViewHolder> {

    private Context mCtx;
    private List<Exercise> mExerciselist;
    private OnItemClickListener mListener;

    public interface OnItemClickListener{
        void onSubClick(int position);//sub button
    }

    public void setOnItemClickListener(OnItemClickListener listener){
        mListener = listener;
    }

    public ExerciseAdapter(Context ctx, List<Exercise> exerciselist) {
        mCtx = ctx;
        this.mExerciselist = exerciselist;
    }

    @NonNull
    @Override
    public ExerciseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mCtx);
        View view = inflater.inflate(R.layout.exercise_card, null); //null is the parent
        return new ExerciseViewHolder(view, mListener);

    }


    @Override
    public void onBindViewHolder(@NonNull ExerciseViewHolder holder, int position) {

        Exercise exercise = mExerciselist.get(position);


        //bind title and view
        holder.textViewName.setText(exercise.getName());
        holder.textViewWt.setText(exercise.getWt());
        holder.textViewRep.setText(exercise.getRep());

    }


    @Override
    public int getItemCount() {
        return mExerciselist.size();
    }

    class ExerciseViewHolder extends RecyclerView.ViewHolder {

        TextView textViewName, textViewWt, textViewRep;
        Button subButton; // Sub button
        EditText wtIn, repIn;
        String wtstr, repstr;

        public ExerciseViewHolder(@NonNull View itemView, final OnItemClickListener listener) {
            super(itemView);

            textViewName = itemView.findViewById(R.id.exname); //populate card views
            textViewWt = itemView.findViewById(R.id.exwt);
            textViewRep = itemView.findViewById(R.id.exrep);
            subButton = itemView.findViewById(R.id.subex); //sub button
            wtIn = itemView.findViewById(R.id.inexwt);
            repIn = itemView.findViewById(R.id.inexrep);

            wtstr = wtIn.getText().toString();
            repstr = repIn.getText().toString();

            subButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(listener != null){
                        int position = getAdapterPosition();
                        if(position != RecyclerView.NO_POSITION){
                            listener.onSubClick(position);
                        }}
                }
            });

        }
    }


}

和主要 Activity :

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //init views
    mGYMDays = (TextView) findViewById(R.id.gymdaystext);
    inputGYMnum = (EditText) findViewById(R.id.inputnum);

    //load data
    loadData();


    //populate list
    final ArrayList<Exercise> exerciselist = new ArrayList<Exercise>();
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));


    //recycle view
    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    //adapter
    adapter = new ExerciseAdapter(this, exerciselist);
    recyclerView.setAdapter(adapter);


    //clicking
    adapter.setOnItemClickListener(new ExerciseAdapter.OnItemClickListener() {

        @Override
        public void onSubClick(int position) {

            Exercise exercise = exerciselist.get(position);
            EditText wtIn = (EditText)findViewById(R.id.inexwt);
            EditText repIn = (EditText) findViewById(R.id.inexrep);

            String newwt = wtIn.getText().toString();
            String newrep = repIn.getText().toString();

            exercise.Wt =  newwt ;
            exercise.Rep = newrep;


            adapter.notifyDataSetChanged();
        }
    });
}

Answer 1

更简洁的解决方案是通过 OnItemClickListener 接口(interface)本身传递两个 EditText 字符串。检查下面的代码，我通过接口(interface)传递字符串，然后仅在 MainActivity 中使用传递的字符串，而不是使用 position 来填充 View 等。

public class ExerciseAdapter extends RecyclerView.Adapter<ExerciseAdapter.ExerciseViewHolder> {

    private Context mCtx;
    private List<Exercise> mExerciselist;
    private OnItemClickListener mListener;

    public interface OnItemClickListener{
        void onSubClick(int position, String wtInText, String repInText);//sub button
    }

    public void setOnItemClickListener(OnItemClickListener listener){
        mListener = listener;
    }

    public ExerciseAdapter(Context ctx, List<Exercise> exerciselist) {
        mCtx = ctx;
        this.mExerciselist = exerciselist;
    }

    @NonNull
    @Override
    public ExerciseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mCtx);
        View view = inflater.inflate(R.layout.exercise_card, null); //null is the parent
        return new ExerciseViewHolder(view, mListener);

    }


    @Override
    public void onBindViewHolder(@NonNull ExerciseViewHolder holder, int position) {

        Exercise exercise = mExerciselist.get(position);


        //bind title and view
        holder.textViewName.setText(exercise.getName());
        holder.textViewWt.setText(exercise.getWt());
        holder.textViewRep.setText(exercise.getRep());

    }


    @Override
    public int getItemCount() {
        return mExerciselist.size();
    }

    class ExerciseViewHolder extends RecyclerView.ViewHolder {

        TextView textViewName, textViewWt, textViewRep;
        Button subButton; // Sub button
        EditText wtIn, repIn;
        String wtstr, repstr;

        public ExerciseViewHolder(@NonNull View itemView, final OnItemClickListener listener) {
            super(itemView);

            textViewName = itemView.findViewById(R.id.exname); //populate card views
            textViewWt = itemView.findViewById(R.id.exwt);
            textViewRep = itemView.findViewById(R.id.exrep);
            subButton = itemView.findViewById(R.id.subex); //sub button
            wtIn = itemView.findViewById(R.id.inexwt);
            repIn = itemView.findViewById(R.id.inexrep);

            wtstr = wtIn.getText().toString();
            repstr = repIn.getText().toString();

            subButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(listener != null){
                        int position = getAdapterPosition();
                        if(position != RecyclerView.NO_POSITION){
                            listener.onSubClick(position, wtstr , repstr);
                        }}
                }
            });

        }
    }


}

主要 Activity :

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //init views
    mGYMDays = (TextView) findViewById(R.id.gymdaystext);
    inputGYMnum = (EditText) findViewById(R.id.inputnum);

    //load data
    loadData();


    //populate list
    final ArrayList<Exercise> exerciselist = new ArrayList<Exercise>();
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));
    exerciselist.add(new Exercise("lat","32", "22"));


    //recycle view
    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    //adapter
    adapter = new ExerciseAdapter(this, exerciselist);
    recyclerView.setAdapter(adapter);


    //clicking
    adapter.setOnItemClickListener(new ExerciseAdapter.OnItemClickListener() {

        @Override
        public void onSubClick(int position, String wtInText, String repInText) {


            // We get the two Strings here directly without needing to use the position of populate the view and then get the edittext and then get the text....
            exercise.Wt =  wtInText;
            exercise.Rep = repInText;


            adapter.notifyDataSetChanged();
        }
    });
}