如何为TextView创建自定义视图并动态更改文本

public class CustomTextView extends TextView {

    public CustomTextView(Context context) {
        super(context);
        init();
    }

    public CustomTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CustomTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        // 初始化设置，如字体、颜色等
        setTypeface(Typeface.DEFAULT_BOLD);
        setTextColor(Color.BLUE);
    }

    public void updateText(String newText) {
        setText(newText);
    }
}

<!-- res/layout/activity_main.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <com.example.myapp.CustomTextView
        android:id="@+id/customTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Initial Text" />
</LinearLayout>

public class MainActivity extends AppCompatActivity {

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

        CustomTextView customTextView = findViewById(R.id.customTextView);
        customTextView.updateText("New Dynamic Text");
    }
}