我正在使用Chris Bane的PhotoView在ViewPager中显示ImageViews。当用户放大图像时,我想禁用ViewPager的滚动。我已经找到了这个Hacky ViewPager,可以通过调用toggleLock()来启用/禁用滚动。
public class HackyViewPager extends ViewPager {
private boolean isLocked;
public HackyViewPager(Context context) {
super(context);
isLocked = false;
}
public HackyViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
isLocked = false;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (!isLocked) {
try {
return super.onInterceptTouchEvent(ev);
}
catch (IllegalArgumentException e) {
e.printStackTrace();
return false;
}
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return !isLocked && super.onTouchEvent(event);
}
public void toggleLock() {
isLocked = !isLocked;
}
public void setLocked(boolean isLocked) {
this.isLocked = isLocked;
}
public boolean isLocked() {
return isLocked;
}
}
因此,我的问题是我不确定何时必须调用toogleLock()。我想我必须实现一个监听器,但是我不确定哪个是最好的。在此先感谢您对我的帮助!
编辑:我自己想通了!
photoview.setOnMatrixChangeListener(new PhotoViewAttacher.OnMatrixChangedListener() {
@Override
public void onMatrixChanged(RectF rectF) {
if (photoview.getScale() > 1) {
sPager.setLocked(true);
} else {
sPager.setLocked(false);
}
}
});
最佳答案
对我来说,photoview.getScale() == 1
总是,我使用缩放。scaleFactor
中的setOnScaleChangeListener
仅是在特定时间的标度,与先前的值无关。我们需要计算累积scaleFactor
。
private float cumulScaleFactor = 1;
photoViewAttacher.setOnScaleChangeListener(new PhotoViewAttacher.OnScaleChangeListener() {
@Override
public void onScaleChange(final float scaleFactor, final float focusX, final float focusY) {
cumulScaleFactor = cumulScaleFactor * scaleFactor;
sPager.setLocked(isValueApproximate(1.0f, cumulScaleFactor));
}
});
private boolean isValueApproximate(final float expectedValue, final float value) {
final float errorMargin = 0.01f;
return Math.abs(expectedValue - value) < errorMargin;
}
关于android - PhotoView的缩放监听器,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/31523247/