我改变了幻灯片与
viewPager.setCurrentItem(index++, true);
但它的变化快。有没有办法手动设置动画速度?
But it changes to fast. Is there a way to set manually the animation speed?
和只发现有人在问同一个无处不在(除了计算器,也许我有运气在这里:)),没有答案。
Searched and only found somebody asking the same everywhere (besides StackOverflow, maybe I have luck here :)), without answers.
像:
https://groups.google.com/group/android-developers/browse_thread/thread/a13405c0b5833893?fwc=1
在此先感谢。
我想做我自己,(但使用反射,)都实现了解决方案。 我没有测试它尚未,但它的应该的工作还是需要稍加修改。测试在Galaxy Nexus的JB 4.2.1。你需要使用一个 ViewPagerCustomDuration
在XML,而不是 ViewPager
,然后你可以这样做:
I've wanted to do myself and have achieved a solution (using reflection, however). I haven't tested it yet but it should work or need minimal modification. Tested on Galaxy Nexus JB 4.2.1. You need to use a ViewPagerCustomDuration
in your XML instead of ViewPager
, and then you can do this:
ViewPagerCustomDuration vp = (ViewPagerCustomDuration) findViewById(R.id.myPager);
vp.setScrollDurationFactor(2); // make the animation twice as slow
ViewPagerCustomDuration.java
ViewPagerCustomDuration.java
:
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.animation.Interpolator;
import java.lang.reflect.Field;
public class ViewPagerCustomDuration extends ViewPager {
public ViewPagerCustomDuration(Context context) {
super(context);
postInitViewPager();
}
public ViewPagerCustomDuration(Context context, AttributeSet attrs) {
super(context, attrs);
postInitViewPager();
}
private ScrollerCustomDuration mScroller = null;
/**
* Override the Scroller instance with our own class so we can change the
* duration
*/
private void postInitViewPager() {
try {
Field scroller = ViewPager.class.getDeclaredField("mScroller");
scroller.setAccessible(true);
Field interpolator = ViewPager.class.getDeclaredField("sInterpolator");
interpolator.setAccessible(true);
mScroller = new ScrollerCustomDuration(getContext(),
(Interpolator) interpolator.get(null));
scroller.set(this, mScroller);
} catch (Exception e) {
}
}
/**
* Set the factor by which the duration will change
*/
public void setScrollDurationFactor(double scrollFactor) {
mScroller.setScrollDurationFactor(scrollFactor);
}
}
ScrollerCustomDuration.java
ScrollerCustomDuration.java
:
import android.annotation.SuppressLint;
import android.content.Context;
import android.view.animation.Interpolator;
import android.widget.Scroller;
public class ScrollerCustomDuration extends Scroller {
private double mScrollFactor = 1;
public ScrollerCustomDuration(Context context) {
super(context);
}
public ScrollerCustomDuration(Context context, Interpolator interpolator) {
super(context, interpolator);
}
@SuppressLint("NewApi")
public ScrollerCustomDuration(Context context, Interpolator interpolator, boolean flywheel) {
super(context, interpolator, flywheel);
}
/**
* Set the factor by which the duration will change
*/
public void setScrollDurationFactor(double scrollFactor) {
mScrollFactor = scrollFactor;
}
@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
super.startScroll(startX, startY, dx, dy, (int) (duration * mScrollFactor));
}
}
希望这可以帮助别人!
Hope this helps someone!
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