我正在尝试放大水平ScrollView的内容。我创建了一个自定义类并处理放大的事件。以下是我的代码：
public class LockableScrollView extends HorizontalScrollView {
private GestureDetector mGestureDetector;
//private onDis mListener;
Context context;
public LockableScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
this.context = context;
}
// true if we can scroll the ScrollView
// false if we cannot scroll
private boolean scrollable = true;
/**
* This method used for setScrolling to ScrollView
*
* @param is
* True in onInterceptTouchEvent returns true else false
*
* */
public void setScrollingEnabled(boolean scrollable) {
this.scrollable = scrollable;
}
/**
* Check is scrollview isScrollable or not
* */
public boolean isScrollable() {
return scrollable;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
//
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
// if we can scroll pass the event to the superclass
if (scrollable)
return super.onTouchEvent(ev);
// only continue to handle the touch event if scrolling enabled
return scrollable;
// scrollable is always false at this point
default:
return super.onTouchEvent(ev);
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// Don't do anything with intercepted touch events if
// we are not scrollable
switch (ev.getAction()) {
case MotionEvent.ACTION_MOVE:
if (scrollable) {
// We're currently scrolling, so yes, intercept the
// touch event!
return super.dispatchTouchEvent(ev);
}
}
return false;
}
}
和活动：
in oncreate
gestureDetector = new GestureDetector(FullImageView.this.getActivity(), new GestureListener());
// animation for scalling
mScaleDetector = new ScaleGestureDetector(FullImageView.this.getActivity(), new ScaleGestureDetector.SimpleOnScaleGestureListener()
{
@Override
public boolean onScale(ScaleGestureDetector detector)
{
float scale = 1 - detector.getScaleFactor();
float prevScale = mScale;
mScale += scale;
if (mScale < 0.1f) // Minimum scale condition:
mScale = 0.1f;
if (mScale > 10f) // Maximum scale condition:
mScale = 10f;
ScaleAnimation scaleAnimation = new ScaleAnimation(1f / prevScale, 1f / mScale, 1f / prevScale, 1f / mScale, detector.getFocusX(), detector.getFocusY());
scaleAnimation.setDuration(0);
scaleAnimation.setFillAfter(true);
//ScrollView layout =(ScrollView) findViewById(R.id.horizontalScrollView1);
scrollView.startAnimation(scaleAnimation);
return true;
}
});
//zoom(4f,4f,new PointF(0,0));
//scrollView.setOnTouchListener(new MyScaleGestures(FullImageView.this.getActivity()));
//scrollView.requestDisallowInterceptTouchEvent(true);
scrollView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent event) {
// TODO Auto-generated method stub
mScaleDetector.onTouchEvent(event);
gestureDetector.onTouchEvent(event);
return gestureDetector.onTouchEvent(event);
}
});
}
private class GestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onDown(MotionEvent e) {
return true;
}
// event when double tap occurs
@Override
public boolean onDoubleTap(MotionEvent e) {
// double tap fired.
return true;
}
}
但我无法放大请帮忙。