优化代码public class SecondActivity extends AppCompatActivity { private TextView textView9, textView11, textView13, textView15, textView17, textView19; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); Intent intent = getIntent(); String num = intent.getStringExtra("num"); String name = intent.getStringExtra("name"); String score1 = intent.getStringExtra("score1"); String score2 = intent.getStringExtra("score2"); String score3 = intent.getStringExtra("score3"); double average = intent.getDoubleExtra("average", 0); textView9 = findViewById(R.id.textView9); textView11 = findViewById(R.id.textView11); textView13 = findViewById(R.id.textView13); textView15 = findViewById(R.id.textView15); textView17 = findViewById(R.id.textView17); textView19 = findViewById(R.id.textView19); textView9.setText(num); textView11.setText(name); textView13.setText(score1); textView15.setText(score2); textView17.setText(score3); textView19.setText(String.format("%.2f", average)); } }

这段代码已经非常简洁，不过还可以进一步优化：

1. 将 findViewById() 方法的调用放在 onStart() 方法中，避免在 onCreate() 方法中执行过多的操作；
2. 使用 ButterKnife 或者 ViewBinding 来代替 findViewById() 方法，可以进一步简化代码。

下面是使用 ButterKnife 优化后的代码：

public class SecondActivity extends AppCompatActivity {
    @BindView(R.id.textView9)
    TextView textView9;
    @BindView(R.id.textView11)
    TextView textView11;
    @BindView(R.id.textView13)
    TextView textView13;
    @BindView(R.id.textView15)
    TextView textView15;
    @BindView(R.id.textView17)
    TextView textView17;
    @BindView(R.id.textView19)
    TextView textView19;

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

        ButterKnife.bind(this);

        Intent intent = getIntent();
        String num = intent.getStringExtra("num");
        String name = intent.getStringExtra("name");
        String score1 = intent.getStringExtra("score1");
        String score2 = intent.getStringExtra("score2");
        String score3 = intent.getStringExtra("score3");
        double average = intent.getDoubleExtra("average", 0);

        textView9.setText(num);
        textView11.setText(name);
        textView13.setText(score1);
        textView15.setText(score2);
        textView17.setText(score3);
        textView19.setText(String.format("%.2f", average));
    }
}

使用 ViewBinding 优化后的代码：

public class SecondActivity extends AppCompatActivity {
    private ActivitySecondBinding binding;

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

        Intent intent = getIntent();
        String num = intent.getStringExtra("num");
        String name = intent.getStringExtra("name");
        String score1 = intent.getStringExtra("score1");
        String score2 = intent.getStringExtra("score2");
        String score3 = intent.getStringExtra("score3");
        double average = intent.getDoubleExtra("average", 0);

        binding.textView9.setText(num);
        binding.textView11.setText(name);
        binding.textView13.setText(score1);
        binding.textView15.setText(score2);
        binding.textView17.setText(score3);
        binding.textView19.setText(String.format("%.2f", average));
    }
}

使用 ButterKnife 或者 ViewBinding 可以使代码更加简洁易读。