在父视图上使用触摸侦听器时如何在孩子上执行点击？

Question

我正在Frame Layout的帮助下对ScaleGestureDetector.OnScaleGestureListener进行放大，缩小和移动操作。

但是问题是我无法对此onClick的子视图执行ZoomableFrameLayout操作。该怎么做？

我正在使用的代码

public class ZoomableFrameLayout extends FrameLayout implements ScaleGestureDetector.OnScaleGestureListener {

private enum Mode {
    NONE,
    DRAG,
    ZOOM
}

private static final String TAG = "ZoomLayout";
private static final float MIN_ZOOM = 1.0f;
private static final float MAX_ZOOM = 2.0f;

private Mode mode = Mode.NONE;
private float scale = 1.0f;
private float lastScaleFactor = 0f;

// Where the finger first  touches the screen
private float startX = 0f;
private float startY = 0f;

// How much to translate the canvas
private float dx = 0f;
private float dy = 0f;
private float prevDx = 0f;
private float prevDy = 0f;

private boolean performClickOnChild;

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

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

public ZoomableFrameLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(context);
}

@SuppressLint("ClickableViewAccessibility")
public void init(Context context) {
    final ScaleGestureDetector scaleDetector = new ScaleGestureDetector(context, this);
    this.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
                switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) {
                    case MotionEvent.ACTION_DOWN:
                        Log.i(TAG, "DOWN");
                        if (scale > MIN_ZOOM) {
                            mode = Mode.DRAG;
                            startX = motionEvent.getX() - prevDx;
                            startY = motionEvent.getY() - prevDy;
                        }
                        break;
                    case MotionEvent.ACTION_MOVE:
                        if (mode == Mode.DRAG) {
                            dx = motionEvent.getX() - startX;
                            dy = motionEvent.getY() - startY;
                        }
                        break;
                    case MotionEvent.ACTION_POINTER_DOWN:
                        Log.i(TAG, "POINTER_DOWN");
                        mode = Mode.ZOOM;
                        break;
                    case MotionEvent.ACTION_POINTER_UP:
                        Log.i(TAG, "POINTER_UP");
                        break;
                    case MotionEvent.ACTION_UP:
                        Log.i(TAG, "UP");
                        mode = Mode.NONE;
                        prevDx = dx;
                        prevDy = dy;
                        break;
                }
                scaleDetector.onTouchEvent(motionEvent);

                if ((mode == Mode.DRAG && scale >= MIN_ZOOM) || mode == Mode.ZOOM) {
                    getParent().requestDisallowInterceptTouchEvent(true);
                    float maxDx = (child().getWidth() - (child().getWidth() / scale)) / 2 * scale;
                    float maxDy = (child().getHeight() - (child().getHeight() / scale)) / 2 * scale;
                    dx = Math.min(Math.max(dx, -maxDx), maxDx);
                    dy = Math.min(Math.max(dy, -maxDy), maxDy);
                    Log.i(TAG, "Width: " + child().getWidth() + ", scale " + scale + ", dx " + dx
                            + ", max " + maxDx);
                    applyScaleAndTranslation();
                }
                return true;
        }
    });
}

// ScaleGestureDetector

@Override
public boolean onScaleBegin(ScaleGestureDetector scaleDetector) {
    Log.i(TAG, "onScaleBegin");
    return true;
}

@Override
public boolean onScale(ScaleGestureDetector scaleDetector) {
    float scaleFactor = scaleDetector.getScaleFactor();
    Log.i(TAG, "onScale" + scaleFactor);
    if (lastScaleFactor == 0 || (Math.signum(scaleFactor) == Math.signum(lastScaleFactor))) {
        scale *= scaleFactor;
        scale = Math.max(MIN_ZOOM, Math.min(scale, MAX_ZOOM));
        lastScaleFactor = scaleFactor;
    } else {
        lastScaleFactor = 0;
    }
    return true;
}

@Override
public void onScaleEnd(ScaleGestureDetector scaleDetector) {
    Log.i(TAG, "onScaleEnd");
}

private void applyScaleAndTranslation() {
    child().setScaleX(scale);
    child().setScaleY(scale);
    child().setTranslationX(dx);
    child().setTranslationY(dy);
}

private View child() {
    return getChildAt(0);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    return true;
}
}