RecyclerView中的數據未從片段傳遞到適配器

Question

創建RecyclerView ，我注意到在Bundle中聲明的字符串沒有從Fragment傳遞到AlertDialog ，並且連接的文本視圖顯示為空白。 有誰知道出了什么問題？ 我是否需要針對這種情況或其他目的使用意圖？

用於片段：

Bundle bundle = new Bundle();
bundle.putString("goalreached",  getResources().getString(R.string.goal_reached));
bundle.putString("day",  getResources().getString(R.string.today));
bundle.putString("distance",  getResources().getString(R.string._3_2_km));
bundle.putString("calories",  getResources().getString(R.string._213_kcal));

用於適配器：

Bundle bundle = new Bundle();
String goalreached = bundle.getString("goalreached");   
String day = bundle.getString("day");
String distance = bundle.getString("distance");                        
String calories = bundle.getString("calories");

預期結果

當前結果

片段類

public class TabFragmentRV extends android.support.v4.app.Fragment {
    RecyclerView mRecyclerView;

    public TabFragmentRV() {}

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_rv, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        View v = getView();
        assert v != null;

        mRecyclerView = v.findViewById(R.id.my_recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));

        Bundle bundle = new Bundle();
        bundle.putString("goalreached",  getResources().getString(R.string.goal_reached));
        bundle.putString("day",  getResources().getString(R.string.today));
        bundle.putString("distance",  getResources().getString(R.string._3_2_km));
        bundle.putString("calories",  getResources().getString(R.string._213_kcal));

        super.onActivityCreated(savedInstanceState);

        initRVAdapter();
    }

    private void initRVAdapter(){
        List<Object> itemsList = new ArrayList<>();

        itemsList.add(new RVLineSeparator());
        itemsList.add(new RVTable("Stats", "Today", "Yesterday", "This week", "This month"));

        RVItemsAapter itemsListAdapter = new RVItemsAapter(getContext());
        mRecyclerView.setAdapter(itemsListAdapter);

        itemsListAdapter.setCallSMSFeed(itemsList);
        itemsListAdapter.notifyDataSetChanged();
    }
}

適配器類

public class RVItemsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private final static int TYPE_TABLE = 1, TYPE_SEPARATOR = 2;
    private ArrayList myArrayList = new ArrayList();
    private Context context;

    public RVItemsAdapter(Context context){
        this. context=context;
    }

    public void setCallSMSFeed(List<Object> myArrayList){
        this.myArrayList = (ArrayList) myArrayList;
    }

    @Override
    public int getItemViewType(int position) {
        if (myArrayList.get(position) instanceof TableRV) {
            return TYPE_TABLE;
        } else if (myArrayList.get(position) instanceof RVLineSeparator) {
            return TYPE_SEPARATOR;
        }
        throw new IllegalArgumentException("Item at position " + position + " is not an instance of either Phonecall or SMSmessage");
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        int viewType=holder.getItemViewType();
        switch (viewType){
            case TYPE_TABLE:
                TableRV tblRV = (TableRV) myArrayList.get(position);
                ((TblViewHolder)holder).bind(tblRV);
                break;
            case TYPE_SEPARATOR:
                ((SeparatorViewHolder)holder).showSeparatorDetails();
                break;
            default:
                throw new IllegalArgumentException("unexpected viewType: " + viewType);
        }
    }

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

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        int layout;
        RecyclerView.ViewHolder viewHolder;
        switch (viewType){
            case TYPE_TABLE:
                layout = R.layout.cardview_tableview_withexpandability;
                View tblView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new TblViewHolder(tblView);
                break;
            case TYPE_SEPARATOR:
                layout = R.layout.lineseparatorforrecyclerview;
                View separatorView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new SeparatorViewHolder(separatorView);
                break;
            default:
                throw new IllegalArgumentException("unexpected viewType: " + viewType);
        }
        return viewHolder;
    }

    public class TblViewHolder extends RecyclerView.ViewHolder {
        final Typeface iconFont = FontManager.getTypeface(context, FontManager.FONTAWESOME);

        private Button btnToday, btnYesterday, btnThisWeek, btnThisMonth;
        private TextView arrowexpandcollapseTextView, sectionNameTextView;

        TblViewHolder(View itemView) {
            super(itemView);

            btnMale.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    AlertDialog alertDialog = new AlertDialog.Builder(v.getContext()).create();

                    alertDialog.setButton(Dialog.BUTTON_NEUTRAL,"OK",new DialogInterface.OnClickListener(){
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });


                    LayoutInflater inflater = LayoutInflater.from(context);
                    @SuppressLint("InflateParams") View content = inflater.inflate(R.layout.dialog_stats, null);
                    alertDialog.setView(content);

                    Bundle bundle = getBundle();
                    String goalreached = bundle.getString("goalreached");   
                    String day = bundle.getString("day");
                    String distance = bundle.getString("distance");                        
                    String calories = bundle.getString("calories");


                    ImageView imgdialogMain = content.findViewById(R.id.imgView_genderA);
                    ivGenderA.setImageResource(R.drawable.ic_male);

                    TextView tvGoalReached = content.findViewById(R.id.txtView_dialog_goalreached);
                    tvGoalReached.setText(goalreached);


                    TextView tvDay = content.findViewById(R.id.txtView_day);
                    tvDay.setText(day);

                    TextView tvImgviewWalking = content.findViewById(R.id.imgView_walking);


                    TextView tvDistance = content.findViewById(R.id.txtView_distance);
                    tvDistance.setText(distance);

                    TextView tvImgviewFire = content.findViewById(R.id.imgView_fire);

                    TextView tvCaloriesBurned = content.findViewById(R.id.txtView_location);
                    tvCaloriesBurned.setText(calories);

                    alertDialog.show();
                }
            });
        }
    }
}

Answer 1

您需要將第一個創建的捆綁軟件傳遞到適配器中（可能是在創建適配器時）

這是帶有必要更改的課程

public class RVItemsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private final static int TYPE_TABLE = 1, TYPE_SEPARATOR = 2;
    private ArrayList myArrayList = new ArrayList();
    private Context context;
    //Added Global bundle
    Private Bundle mBundle;

    public RVItemsAdapter(Context context){
        this. context=context;
    }

    //Added Constructor
    public RVItemsAdapter(Context context, Bundle bundle){
        this.context=context;
        this.mBundle = bundle;
    } 

    public void setCallSMSFeed(List<Object> myArrayList){
        this.myArrayList = (ArrayList) myArrayList;
    }

    @Override
    public int getItemViewType(int position) {
        if (myArrayList.get(position) instanceof TableRV) {
            return TYPE_TABLE;
        } else if (myArrayList.get(position) instanceof RVLineSeparator) {
            return TYPE_SEPARATOR;
        }
        throw new IllegalArgumentException("Item at position " + position + " is not an instance of either Phonecall or SMSmessage");
    }

    //Update Bundle
    public void updateView(Bundle bundle){
        mBundle = bundle;
        this.notifyDataSetChanged();
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        int viewType=holder.getItemViewType();
        switch (viewType){
            case TYPE_TABLE:
                TableRV tblRV = (TableRV) myArrayList.get(position);
                ((TblViewHolder)holder).bind(tblRV);
                break;
            case TYPE_SEPARATOR:
                ((SeparatorViewHolder)holder).showSeparatorDetails();
                break;
            default:
                throw new IllegalArgumentException("unexpected viewType: " + viewType);
        }
    }

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

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        int layout;
        RecyclerView.ViewHolder viewHolder;
        switch (viewType){
            case TYPE_TABLE:
                layout = R.layout.cardview_tableview_withexpandability;
                View tblView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new TblViewHolder(tblView);
                break;
            case TYPE_SEPARATOR:
                layout = R.layout.lineseparatorforrecyclerview;
                View separatorView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new SeparatorViewHolder(separatorView);
                break;
            default:
                throw new IllegalArgumentException("unexpected viewType: " + viewType);
        }
        return viewHolder;
    }

    public class TblViewHolder extends RecyclerView.ViewHolder {
        final Typeface iconFont = FontManager.getTypeface(context, FontManager.FONTAWESOME);

        private Button btnToday, btnYesterday, btnThisWeek, btnThisMonth;
        private TextView arrowexpandcollapseTextView, sectionNameTextView;

        TblViewHolder(View itemView) {
            super(itemView);

            btnMale.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    AlertDialog alertDialog = new AlertDialog.Builder(v.getContext()).create();

                    alertDialog.setButton(Dialog.BUTTON_NEUTRAL,"OK",new DialogInterface.OnClickListener(){
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });


                    LayoutInflater inflater = LayoutInflater.from(context);
                    @SuppressLint("InflateParams") View content = inflater.inflate(R.layout.dialog_stats, null);
                    alertDialog.setView(content);

                    //Pulling String out of bundle
                    String goalreached = mBundle.getString("goalreached");   
                    String day = mBundle.getString("day");
                    String distance = mBundle.getString("distance");                        
                    String calories = mBundle.getString("calories");


                    ImageView imgdialogMain = content.findViewById(R.id.imgView_genderA);
                    ivGenderA.setImageResource(R.drawable.ic_male);

                    TextView tvGoalReached = content.findViewById(R.id.txtView_dialog_goalreached);
                    tvGoalReached.setText(goalreached);


                    TextView tvDay = content.findViewById(R.id.txtView_day);
                    tvDay.setText(day);

                    TextView tvImgviewWalking = content.findViewById(R.id.imgView_walking);


                    TextView tvDistance = content.findViewById(R.id.txtView_distance);
                    tvDistance.setText(distance);

                    TextView tvImgviewFire = content.findViewById(R.id.imgView_fire);

                    TextView tvCaloriesBurned = content.findViewById(R.id.txtView_location);
                    tvCaloriesBurned.setText(calories);

                    alertDialog.show();
                }
            });
        }
    }
}

當前，您只是在片段中創建一個新捆綁包，然后向其中添加字符串，然后對其進行任何操作，然后在適配器中創建另一個新捆綁包，並嘗試提取不存在的字符串。

要更新數據，您可以在需要更新數據時嘗試在適配器中調用類似的方法（但不確定notifyDataSetChanged（）是否可以從適配器內部運行）：

//Update Bundle
public void updateView(Bundle bundle){
    mBundle = bundle;
    this.notifyDataSetChanged();
}

Answer 2

您正在嘗試從此處的新捆綁包中獲取其他服務：

Bundle bundle = new Bundle();
String goalreached = bundle.getString("goalreached");
...

您需要獲取將信息存儲在其中的捆綁軟件。 捆綁包只是信息的“容器”，因此您需要先存儲它，然后再檢索它。

您永遠不會將捆綁軟件保存在任何地方，因此以后將無法閱讀。

我不確定您要在這里做什么，所以我不能舉一個例子，只需要檢查一下：

Bundle bundle = new Bundle();
bundle.putString("goalreached",  getResources().getString(R.string.goal_reached));
bundle.putString("day",  getResources().getString(R.string.today));
bundle.putString("distance",  getResources().getString(R.string._3_2_km));
bundle.putString("calories",  getResources().getString(R.string._213_kcal));

您正在創建該捆綁包，然后存儲信息，僅此而已。 您永遠不會將其存儲在任何地方。

捆綁軟件的基本用法是將其存儲在Intent上，然后檢索該Intent並獲取捆綁軟件。