Android无法设置文本视图的颜色

TextView textView = findViewById(R.id.text_view);
SpannableString spannableString = new SpannableString("Hello, World!");
ForegroundColorSpan colorSpan = new ForegroundColorSpan(Color.RED);
spannableString.setSpan(colorSpan, 0, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);

TextView textView = findViewById(R.id.text_view);
String htmlString = "<font color='#FF0000'>Hello, World!</font>";
Spanned spanned = Html.fromHtml(htmlString);
textView.setText(spanned);

public class CustomTextView extends TextView {
    private Paint paint;

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

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

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

    private void init() {
        paint = new Paint();
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.FILL);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawText(getText().toString(), 0, getText().length(), 0, getTextSize(), paint);
    }
}

<com.example.app.CustomTextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello, World!" />