自定义对话框中的 Android Recycler View 不显示

Question

I'm creating an Android app that shows a simple skin color picker using a custom Dialog and a (horizontal) Recycler View .

But when I show the Dialog (by clicking an Edit Text ), the Dialog appeared but the Recycler View didn't like this image below. The Dialog only showed the Button .

Did I miss something in my codes? Maybe in the Recycler View Adapter .

Here are the codes:

arrays.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="skinColors">
        <item>#f26ab8</item>
        <item>#531216</item>
        <item>#ee8c5c</item>
        <item>#8b1929</item>
        <item>#f5a20f</item>
        <item>#2b6c99</item>
        <item>#73def6</item>
        <item>#f89e0a</item>
        <item>#6e938a</item>
        <item>#132855</item>
    </string-array>
</resources>

item_card_view_color.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="150dp"
    android:layout_height="150dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardCornerRadius="10dp"
    android:layout_margin="10dp"
    android:id="@+id/cardViewColor">

</androidx.cardview.widget.CardView>

dialog_color_list_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="@color/white">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerViewColorList"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        app:layout_constraintBottom_toTopOf="@+id/buttonPilih"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:listitem="@layout/item_card_view_color"
        android:layout_marginBottom="10dp"/>

    <Button
        android:id="@+id/buttonPilih"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_margin="10dp"
        android:text="@string/pilih"
        android:textAllCaps="false"/>

</androidx.constraintlayout.widget.ConstraintLayout>

SkinColorHelper.java

public class SkinColorHelper {
    public static List<Integer> getSkinColorList(Context context) {
        String[] skinColorList = context.getResources().getStringArray(R.array.skinColors);
        List<Integer> output = new ArrayList<>();
        for(int i = 0; i < skinColorList.length; i++) {
            int color = Color.parseColor(skinColorList[i]);
            output.add(color);
        }
        return output;
    }
}

SkinColorPickerAdapter.java

public class SkinColorPickerAdapter extends RecyclerView.Adapter<SkinColorPickerAdapter.CardViewHolder> {
    private List<Integer> skinColorList = new ArrayList<>();

    public SkinColorPickerAdapter() {
    }

    void setSkinColorList(List<Integer> skinColorList) {
        this.skinColorList = skinColorList;
    }

    @NonNull
    @Override
    public CardViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        ItemCardViewColorBinding binding = ItemCardViewColorBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false);
        return new CardViewHolder(binding);
    }

    @Override
    public void onBindViewHolder(@NonNull SkinColorPickerAdapter.CardViewHolder holder, int position) {
        int color = skinColorList.get(position);
        holder.bind(color);
    }

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

    public class CardViewHolder extends RecyclerView.ViewHolder{
        private ItemCardViewColorBinding binding;

        public CardViewHolder(ItemCardViewColorBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }

        void bind(int color) {
            binding.cardViewColor.setBackgroundColor(color);
        }
    }
}

activity_input_measurement.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.patient.inputmeasurement.InputMeasurementActivity">

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginHorizontal="50dp">

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/editTextWarnaKulitJari"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:clickable="false"
                android:cursorVisible="false"
                android:drawableStart="@drawable/ic_baseline_circle_24"
                android:drawablePadding="10dp"
                android:gravity="center_vertical"
                android:hint="skin color picker"
                android:inputType="text"
                android:textColor="@color/black"
                android:textColorHint="@color/black"
                android:textSize="14sp" />
        </com.google.android.material.textfield.TextInputLayout>

    </LinearLayout>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/buttonSimpan"
        android:text="@string/simpan"
        android:textAllCaps="false"
        android:textSize="14sp"
        android:layout_margin="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

InputMeasurementActivity.java

public class InputMeasurementActivity extends AppCompatActivity implements View.OnClickListener {

    // GENERAL
    ActivityInputMeasurementBinding binding;
    String TAG = getClass().getSimpleName();
    ArrayList<HashMap<String, Object>> patientList = new ArrayList<>();
    Dialog dialog;
    DialogColorListPickerBinding dialogBinding;

    // KEYS FOR PATIENT DATA
    String keyPatientId = "id";
    String keyPatientName = "name";
    String keyPatientGender = "gender";
    String keyPatientNik = "nik";
    String keyPatientBirthDate = "birthDate";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityInputMeasurementBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        dialog = new Dialog(this);
        dialogBinding = DialogColorListPickerBinding.inflate(getLayoutInflater());

        initializeColorListPickerDialog();
        hideProgressBar();

        binding.editTextWarnaKulitJari.setOnClickListener(this);
    }

    // ON CLICK LISTENER
    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.editTextWarnaKulitJari) {
            dialog.show();
        }
    }

    private void showProgressBar() {
        binding.linearLayout.setVisibility(View.GONE);
        binding.progressBar.setVisibility(View.VISIBLE);
    }

    private void hideProgressBar() {
        binding.linearLayout.setVisibility(View.VISIBLE);
        binding.progressBar.setVisibility(View.GONE);
    }

    
    private void addDataToSkinColorRecylcerView() {
        List<Integer> colorList = SkinColorHelper.getSkinColorList(this);
        Log.d(TAG, "colorListSize: " + colorList.size() + " colorList: " + colorList.toString());

        SkinColorPickerAdapter adapter = new SkinColorPickerAdapter();
        adapter.setSkinColorList(colorList);
        adapter.notifyDataSetChanged();

        LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);

        dialogBinding.recyclerViewColorList.setLayoutManager(layoutManager);
        dialogBinding.recyclerViewColorList.setHasFixedSize(true);
        dialogBinding.recyclerViewColorList.setAdapter(adapter);
    }

    private void initializeColorListPickerDialog() {
        addDataToSkinColorRecylcerView();

        dialog.setContentView(R.layout.dialog_color_list_picker);
        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    }
}

Answer 1

UPDATE

I saw that your adapter was set up totally wrong. I think you got confused at the end of the closely same names in your app. But the good news are, that I fixed that for you. Here is your SkinColorPickerAdapter.class :

public class SkinColorPickerAdapter extends RecyclerView.Adapter<SkinColorPickerAdapter.CardViewHolder> {
    private List<Integer> skinColorList = new ArrayList<>();

    public SkinColorPickerAdapter() {
    }

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

    @Override
    public void onBindViewHolder(@NonNull SkinColorPickerAdapter.CardViewHolder holder, int position) {
        int color = skinColorList.get(position);
        holder.cardView.setCardBackgroundColor(color);
    }

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

    public void setSkinColorList(List<Integer> skinColorList) {
        this.skinColorList = skinColorList;
        notifyDataSetChanged();
    }


    public class CardViewHolder extends RecyclerView.ViewHolder{
        private CardView cardView;

        public CardViewHolder(View view) {
            super(view);
            this.cardView = view.findViewById(R.id.cardViewColor);
        }
    }
}

And here your InputMeasurementActivity.class:

public class InputMeasurementActivity extends AppCompatActivity implements View.OnClickListener {

    // GENERAL
    ActivityInputMeasurementBinding binding;
    String TAG = getClass().getSimpleName();
    ArrayList<HashMap<String, Object>> patientList = new ArrayList<>();
    AlertDialog dialog;
    AlertDialog.Builder dialogBuilder;

    // KEYS FOR PATIENT DATA
    String keyPatientId = "id";
    String keyPatientName = "name";
    String keyPatientGender = "gender";
    String keyPatientNik = "nik";
    String keyPatientBirthDate = "birthDate";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityInputMeasurementBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
        hideProgressBar();
        binding.editTextWarnaKulitJari.setOnClickListener(this);
    }

    // ON CLICK LISTENER
    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.editTextWarnaKulitJari) {
            initializeColorListPickerDialog();
        }
    }

    private void showProgressBar() {
        binding.linearLayout.setVisibility(View.GONE);
        binding.progressBar.setVisibility(View.VISIBLE);
    }

    private void hideProgressBar() {
        binding.linearLayout.setVisibility(View.VISIBLE);
        binding.progressBar.setVisibility(View.GONE);
    }




    private void initializeColorListPickerDialog() {


        List<Integer> colorList = SkinColorHelper.getSkinColorList(this);

        SkinColorPickerAdapter adapter = new SkinColorPickerAdapter();
        adapter.setSkinColorList(colorList);
        dialogBuilder = new AlertDialog.Builder(this);
        View view = getLayoutInflater().inflate(R.layout.dialog_color_list_picker,null);
        view.setClipToOutline(true);
        dialogBuilder.setView(view);


        RecyclerView recyclerView = view.findViewById(R.id.recyclerViewColorList);
        recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
        recyclerView.setHasFixedSize(true);
        SkinColorPickerAdapter skinColorPickerAdapter = new SkinColorPickerAdapter();
        skinColorPickerAdapter.setSkinColorList(colorList);
        recyclerView.setAdapter(skinColorPickerAdapter);
        dialog = dialogBuilder.create();
        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        dialog.show();

    }
}

And I changed the size of your recyclerView in your dialog_color_list_picker.xml :

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="@color/white">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerViewColorList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        app:layout_constraintBottom_toTopOf="@+id/buttonPilih"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:listitem="@layout/item_card_view_color"
        android:layout_marginBottom="10dp"/>

    <Button
        android:id="@+id/buttonPilih"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_margin="10dp"
        android:text="@string/pilih"
        android:textAllCaps="false"/>

</androidx.constraintlayout.widget.ConstraintLayout>

FINAL RESULT