今天介紹一下單選的列表 透過簡單的程式碼就可以做出一個清晰易懂的選擇表單
那就馬上附上我的程式碼~

public class MainActivity extends AppCompatActivity {

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

        Button button=findViewById(R.id.btn);
        button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            dialog();
        }
    });

    }
    private void dialog(){
    final String choose[]={"A","B","C","D","以上皆是"};//創一個字串的陣列 要把它塞到dialog裡面
    
    AlertDialog.Builder builder=new AlertDialog.Builder(this);
    builder.setTitle("單選題"); //設置它的標題
    builder.setSingleChoiceItems(choose,0,new DialogInterface.OnClickListener() {
    //把它設置為單選的型態
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            Toast.makeText(MainActivity.this, "選擇了"+choose[i], Toast.LENGTH_SHORT).show();
            //提醒使用者點選了選項
        }
    });
    builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {

        }
    });
    builder.create().show(); //也是一樣記得創建他並顯示
    }

}

就能做出這樣子的dialog囉