Android Java 自定义View

步骤

自定义 View 

public class CustomView extends View {
 
    private Paint paint;
 
    public CustomView(Context context) {
        super(context);
        init();
    }
 
    public CustomView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }
 
    private void init() {
        paint = new Paint();
        paint.setColor(Color.BLUE)