java - android - 描画を検証する方法

Question

私のアプリでは、顧客はプロセスの最後に署名する必要があります。以下のコードは、私がそれを機能させる方法です。

DrawView

public class DrawView 
extends View {

    private static final float STROKE_WIDTH = 5f;

    /** Need to track this so the dirty region can accommodate the stroke. **/
    private static final float HALF_STROKE_WIDTH = STROKE_WIDTH / 2;

    private Paint paint = new Paint();
    private Path path = new Path();

    /** Optimizes painting by invalidating the smallest possible area. */
    private float lastTouchX;
    private float lastTouchY;
    private final RectF dirtyRect = new RectF();

    public DrawView(Context context) {
        super(context);

        paint.setAntiAlias(true);
        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeJoin(Paint.Join.ROUND);
        paint.setStrokeWidth(STROKE_WIDTH);
    }

    /** Erases the signature. */
    public void clear() {
        path.reset();

        // Repaints the entire view.
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawPath(path, paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float eventX = event.getX();
        float eventY = event.getY();

        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            path.moveTo(eventX, eventY);
            lastTouchX = eventX;
            lastTouchY = eventY;
            // There is no end point yet, so don't waste cycles invalidating.
            return true;

        case MotionEvent.ACTION_MOVE:
        case MotionEvent.ACTION_UP:
            // Start tracking the dirty region.
            resetDirtyRect(eventX, eventY);

            // When the hardware tracks events faster than they are delivered,
            // the
            // event will contain a history of those skipped points.
            int historySize = event.getHistorySize();
            //Logger.debug("historySize : " + historySize);
            for (int i = 0; i < historySize; i++) {
                float historicalX = event.getHistoricalX(i);
                float historicalY = event.getHistoricalY(i);
                expandDirtyRect(historicalX, historicalY);
                path.lineTo(historicalX, historicalY);
            }
            path.lineTo(eventX, eventY);

            break;

        default:
            //Logger.debug("Ignored touch event: " + event.toString());
            return false;
        }

        // Include half the stroke width to avoid clipping.
        invalidate((int) (dirtyRect.left - HALF_STROKE_WIDTH), (int) (dirtyRect.top - HALF_STROKE_WIDTH), (int) (dirtyRect.right + HALF_STROKE_WIDTH), (int) (dirtyRect.bottom + HALF_STROKE_WIDTH));

        lastTouchX = eventX;
        lastTouchY = eventY;

        return true;
    }

    /** Called when replaying history to ensure the dirty region includes all
     * points. */
    private void expandDirtyRect(float historicalX, float historicalY) {
        if (historicalX < dirtyRect.left) {
            dirtyRect.left = historicalX;
        } else if (historicalX > dirtyRect.right) {
            dirtyRect.right = historicalX;
        }
        if (historicalY < dirtyRect.top) {
            dirtyRect.top = historicalY;
        } else if (historicalY > dirtyRect.bottom) {
            dirtyRect.bottom = historicalY;
        }
    }

    /** Resets the dirty region when the motion event occurs. */
    private void resetDirtyRect(float eventX, float eventY) {

        // The lastTouchX and lastTouchY were set when the ACTION_DOWN
        // motion event occurred.
        dirtyRect.left = Math.min(lastTouchX, eventX);
        dirtyRect.right = Math.max(lastTouchX, eventX);
        dirtyRect.top = Math.min(lastTouchY, eventY);
        dirtyRect.bottom = Math.max(lastTouchY, eventY);
    }
}

FrameLayout を使用して、このようにアプリに表示します。

FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
drawView = new DrawView(this);
drawView.requestFocus();
preview.addView(drawView);

正常に動作しています。私の質問は、これをどのように検証するかです。顧客がまだ署名していないというポップアップを表示するとします。ご意見をお聞かせください。