Androidを支える技術Iのサンプルに作ったカスタムビュー

HelloCustomView.java

public class HelloCustomView extends View {
    String first;
    String second;

    public HelloCustomView(Context context, AttributeSet attrs) {
        super(context, attrs);


        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.HelloCustomView, 0, 0);

        first = a.getString(R.styleable.HelloCustomView_firstText);
        second = a.getString(R.styleable.HelloCustomView_secondText);

        a.recycle();
        every5Secondes();
    }

    Paint bgpaint = new Paint();
    Paint fgpaint = new Paint();

    @Override
    protected void onDraw(Canvas canvas) {
        bgpaint.setStyle(Paint.Style.FILL);
        bgpaint.setColor(Color.RED);

        canvas.drawRect(0, 0, getWidth(), getHeight(), bgpaint);

        fgpaint.setColor(Color.BLACK);
        fgpaint.setTextSize(100);

        // String text = isAltText ? "Custom" : "Hello";
        String text = isAltText ? second : first;

        canvas.drawText(text, 10, 100, fgpaint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN) {
            Toast.makeText(getContext(), "touched!", Toast.LENGTH_LONG).show();
            return true;
        }
        return super.onTouchEvent(event);
    }

    Handler handler = new Handler();
    boolean isAltText = false;

    void every5Secondes() {
        isAltText = !isAltText;
        invalidate();

        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                every5Secondes();
            }
        }, 5000);
    }



}