一、需求UI图

直接拍了下自己手绘的UI需求图，如下所示。包含一个关闭的按钮，RecyclerView点击选择项，选择项中被选中项显示出一个表示被选中的图片，其余未选的项中该图片隐藏。

二、代码设计步骤

（1）三个弹窗中复用的drawable：dialog_background.xml

（2）radio_button_dialog.xml，其中包含RecyclerView，所以还需要设计对应的radio.button_dialog_item.xml和适配器RadioButtonDialogAdapter.java

（3）RadionButtonDialogFragment.java

（4）DialogUtils工具类中定义对应的showRadioButtonDialogFragment方法

（5）Activity中设置点击事件，复用showRadioButtonDialogFragment方法。
在调用方法之前，先定义了一个VehicleAlertSensitivity枚举类作为数据源。

三、源码

（1）dialog_background.xml
即最初的背景，可设置颜色，圆角等属性，供几个弹窗的xml复用。

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="15dp" />
    <solid android:color="@color/cardview_shadow_start_color" />
</shape>

（2）radio_button_dialog.xml，其中包含RecyclerView，所以还需要设计对应的radio.button_dialog_item.xml和适配器RadioButtonDialogAdapter.java

先看radio_button_dialog.xml，它包含三个控件，即标题TextView，关闭按钮ImageView，和一个RecyclerView。
代码如下：

<?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"
    android:background="@drawable/dialog_background">

    <ImageView
        android:id="@+id/close"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/close" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="90dp"
        android:layout_marginStart="30dp"
        android:textSize="26sp"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="@+id/close"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/close"
        app:layout_constraintTop_toTopOf="@+id/close" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="20dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/title" />

</androidx.constraintlayout.widget.ConstraintLayout>

其中的ImageView中对应的图片即一个关闭图片，从UI切图中放入drawable中即可。

由于使用到了RecyclerView，所以还需要写对应的list_item和适配器。

先写radio_button_dialog_item.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:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/content_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="12dp"
        android:text="偏离报警"
        android:textSize="26sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/selected_image"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_marginEnd="32dp"
        app:layout_constraintBottom_toBottomOf="@+id/content_text"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@+id/content_text"
        app:srcCompat="@drawable/radio_button_selected" />

    <View
        android:id="@+id/divider"
        android:layout_width="0dp"
        android:layout_height="1dp"
        android:layout_marginTop="12dp"
        android:background="@color/black"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/content_text" />

</androidx.constraintlayout.widget.ConstraintLayout>

其中的ImageView就是当前选项被选中时，该项中显示被选中的图片，直接导入UI切图即可，切图长这样：

还有一个注意点就是其中View控件的使用，实现了每一项中的下划线，很巧妙。

最后一个就是对应的适配器RadioButtonDialogAdapter.java的定义：

public class RadioButtonDialogAdapter extends RecyclerView.Adapter<RadioButtonDialogAdapter.RadioButtonDialogViewHolder> {
    
    

    List<String> items;
    int index;
    OnClickListener listener;
    Context context;

    public RadioButtonDialogAdapter(Context context, List<String> items, OnClickListener listener) {
    
    
        this.context = context;
        this.items = items;
        this.listener = listener;
    }

    @NonNull
    @Override
    public RadioButtonDialogViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    
    
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.radio_button_dialog_item, viewGroup, false);
        RadioButtonDialogViewHolder viewHolder = new RadioButtonDialogViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull RadioButtonDialogViewHolder radioButtonDialogViewHolder, int i) {
    
    
        String item = items.get(i);
        radioButtonDialogViewHolder.container.setOnClickListener(view -> {
    
    
            if (listener != null) {
    
    
                listener.onClick(i);
            }
        });
        radioButtonDialogViewHolder.contentText.setText(item);
        radioButtonDialogViewHolder.contentText.setTextColor(i == index ? context.getColor(R.color.green) : context.getColor(R.color.white));
        radioButtonDialogViewHolder.selectedImage.setVisibility(i == index ? View.VISIBLE : View.GONE);
        radioButtonDialogViewHolder.divider.setVisibility(i == items.size() - 1 ? View.GONE : View.VISIBLE);
    }

    @Override
    public int getItemCount() {
    
    
        return items == null ? 0 : items.size();
    }

    public void setIndex(int index) {
    
    
        this.index = index;
    }

    class RadioButtonDialogViewHolder extends RecyclerView.ViewHolder {
    
    

        ConstraintLayout container;
        TextView contentText;
        ImageView selectedImage;
        View divider;

        public RadioButtonDialogViewHolder(@NonNull View itemView) {
    
    
            super(itemView);

            container = itemView.findViewById(R.id.container);
            contentText = itemView.findViewById(R.id.content_text);
            selectedImage = itemView.findViewById(R.id.selected_image);
            divider = itemView.findViewById(R.id.divider);
        }
    }

    public interface OnClickListener {
    
    
        void onClick(int index);
    }
}

（3）RadionButtonDialogFragment.java
弹窗界面及对应点击事件设计

public class RadioButtonDialogFragment extends DialogFragment {
    
    

    List<String> items;

    private RadioButtonDialogFragmentListener listener;

    int index = 0;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,
                             @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    
    
        getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);

        View view = inflater.inflate(R.layout.radio_button_dialog, container, false);
        Bundle arguments = getArguments();
        String title = arguments.getString("title");
        items = arguments.getStringArrayList("data");
        index = arguments.getInt("index");
        ImageView closeImage = view.findViewById(R.id.close);
        TextView titleText = view.findViewById(R.id.title);
        RecyclerView list = view.findViewById(R.id.list);

        titleText.setText(title);

        RadioButtonDialogAdapter adapter = new RadioButtonDialogAdapter(getContext(), this.items, index -> {
    
    
            if (listener != null) {
    
    
                listener.onClick(index);
            }
            getDialog().cancel();
        });
        adapter.setIndex(index);
        list.setAdapter(adapter);
        list.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false));
        closeImage.setOnClickListener(v -> getDialog().cancel());
        return view;
    }

    @Override
    public void onStart() {
    
    
        super.onStart();
        Dialog dialog = getDialog();
        if (dialog != null ) {
    
    
            DisplayMetrics dm = new DisplayMetrics();
            getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
            int height = ViewGroup.LayoutParams.MATCH_PARENT;
            Window window = getDialog().getWindow();
            window.setLayout((int) (dm.widthPixels * 0.5), height);
            window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

            WindowManager.LayoutParams windowParams = window.getAttributes();
            windowParams.dimAmount = 0.5f;
            window.setAttributes(windowParams);
        }
    }

    public void setIndex(int index) {
    
    
        this.index = index;
    }

    public void setListener(RadioButtonDialogFragmentListener listener) {
    
    
        this.listener = listener;
    }

    public interface RadioButtonDialogFragmentListener {
    
    
        void onClick(int index);
    }
}

（4）DialogUtils工具类中定义showRadioButtonDialogFragment方法：

方法如下：

public static void showRadioButtonDialogFragment(
            AppCompatActivity activity,
            ArrayList<String> data,
            String title,
            int currentIndex,
            RadioButtonDialogFragment.RadioButtonDialogFragmentListener listener) {
    
    

        RadioButtonDialogFragment fragment = new RadioButtonDialogFragment();
        Bundle bundle = new Bundle();
        bundle.putString("title", title);
        bundle.putStringArrayList("data", data);
        bundle.putInt("index", currentIndex);
        fragment.setArguments(bundle);
        fragment.setListener(listener);
        fragment.show(activity.getSupportFragmentManager(), "fragment");
    }

（5）在Activity中设置点击事件，复用showRadioButtonDialogFragment方法实现多个功能相同的弹窗显示。

在调用点击事件之前，对于不同的数据项，定义不同的枚举类放置数据，如RecycleView中如果有三行选项，内容分别为标准、低、高时，定义如下枚举类供后续调用：

public enum VehicleAlertSensitivity {
    
    

    STANDARD(0X01,"标准"),
    LOW(0x02,"低"),
    HIGH(0x03,"高");

    private int code;
    private String content;

    public int getCode() {
    
    
        return code;
    }

    public String getContent() {
    
    
        return content;
    }

    VehicleAlertSensitivity(int code, String content) {
    
    
        this.code = code;
        this.content = content;
    }

    public static int getCode(String content) {
    
    
        for (VehicleAlertSensitivity mode : VehicleAlertSensitivity.values()) {
    
    
            if (content == mode.getContent()) {
    
    
                return mode.getCode();
            }
        }
        return -1;
    }

    public static String getContent(int code) {
    
    
        for (VehicleAlertSensitivity mode : VehicleAlertSensitivity.values()) {
    
    
            if (code == mode.getCode()) {
    
    
                return mode.getContent();
            }
        }
        return "";
    }

    public static ArrayList<String> getAllContents() {
    
    
        ArrayList<String> contents = new ArrayList<>();
        for (VehicleAlertSensitivity mode : VehicleAlertSensitivity.values()) {
    
    
            contents.add(mode.getContent());
        }
        return contents;
    }
}

在准备好枚举类的数据后，接下来继续看点击事件显示弹窗的功能实现：

（1）先声明一个存储数据的ArrayList：

    ArrayList<String> vehicleAlertSensitivities;

（2）使用刚刚定义的枚举类.getAllContents（）获取数据给刚刚定义的ArrayList。

vehicleAlertSensitivities = VehicleAlertSensitivity.getAllContents();

（3）接着就是对对应的点击事件调用显示弹窗的方法，实现显示弹窗的功能

        alarmSensitivityContainer.setItemClickListener(() -> {
    
    
            DialogUtils.showRadioButtonDialogFragment(
                    AssistDrivingActivity.this,
                    vehicleAlertSensitivities,
                    String.format(getString(R.string.setting_dialog_title), "车" + getString(R.string.alarm_sensitivity)),
                    maintainLaneAlarmSensitivityIndex,
                    index -> {
    
    
                        maintainLaneAlarmSensitivityIndex = index;
                        alarmSensitivityContainer.setBottomTextContent(vehicleAlertSensitivities.get(maintainLaneAlarmSensitivityIndex));
                    });
        });

上面的代码如下图所示：