今天要介紹的用法是在Dialog裡面加入一個Recyclerview，馬上來看一下怎麼使用

dialog

首先先創一個dialog的layout，用來自定義dialog的樣式，這邊就簡單做一個

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:orientation="vertical"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="1dp">

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="2"
            android:text="Dialog"
            android:gravity="center"/>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerview"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="7" />
    </LinearLayout>

然後再創立一個layout，用來設定Recyclerview的樣式

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:orientation="vertical"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView4"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="分數:"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/textView5"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="5"
                android:text="TextView"
                android:textSize="20sp" />
        </LinearLayout>

        <TextView
            android:id="@+id/textView6"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            />

接著就回到程式碼部分，一樣要做一個adapter去綁定

Adatper

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private ArrayList<HashMap<String,String>> dataList;
    public MyAdapter(ArrayList<HashMap<String,String>> dataList) {
        this.dataList = dataList;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // 創建 ViewHolder 並連結項目佈局檔案
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder holder, int position) {
        // 在這裡綁定數據到 ViewHolder 的 View
        String itemView = String.valueOf(dataList.get(position));
        holder.textView5.setText(dataList.get(position).get("score"));

    }

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

    public class MyViewHolder extends RecyclerView.ViewHolder {

        private TextView textView5;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textView5 = itemView.findViewById(R.id.textView5);
        }
    }
}

主程式

public class MainActivity extends AppCompatActivity {
    private Dialog dialog;
    private RecyclerView recyclerView;
    private MyAdapter myAdapter;
    private ArrayList<HashMap<String,String>> dataList;
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dialog = new Dialog(this);
        dialog.setContentView(R.layout.recyclerview_dialog); // 設置對話框的佈局
        recyclerView = dialog.findViewById(R.id.recyclerview);
        dataList = new ArrayList<>();
        for(int i =0;i<=29;i++){
            HashMap<String,String> hashMap = new HashMap<>();
            hashMap.put("score",String.valueOf(new Random().nextInt(80) + 20));
            dataList.add(hashMap); // 添加到數據列表中
        }
        myAdapter = new MyAdapter(dataList);
        recyclerView.setAdapter(myAdapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this)); // 設置RecyclerView的佈局管理器
        button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dialog.show(); // 點擊按鈕時顯示對話框
            }
        });
    }
}

結果如下