出了点小问题。我的动画不工作。我没有收到任何错误。只是我的动画不起作用。
这是我的代码。
public class MainActivity extends FragmentActivity {
private PagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.initialisePaging();
}
private void initialisePaging() {
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this, Tab1Fragment.class.getName()));
fragments.add(Fragment.instantiate(this, Tab2Fragment.class.getName()));
fragments.add(Fragment.instantiate(this, Tab3Fragment.class.getName()));
this.mPagerAdapter = new PagerAdapter(super.getSupportFragmentManager(), fragments);
ViewPager pager = (ViewPager)super.findViewById(R.id.pager);
pager.setAdapter(this.mPagerAdapter);
pager.setPageTransformer(true, new ZoomOutPageTransformer());
}
public static class Tab1Fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (ImageView)inflater.inflate(R.layout.tab_frag1_layout, container, false);
}
}
public static class Tab2Fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (ImageView)inflater.inflate(R.layout.tab_frag2_layout, container, false);
}
}
public static class Tab3Fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (ImageView)inflater.inflate(R.layout.tab_frag3_layout, container, false);
}
}
public static class PagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public PagerAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
}
public static class ZoomOutPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.85f;
private static final float MIN_ALPHA = 0.5f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
int pageHeight = view.getHeight();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
// view.setAlpha(0);
ViewHelper.setAlpha(view, 0);
} else if (position <= 1) { // [-1,1]
// Modify the default slide transition to shrink the page as well
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
// view.setTranslationX(horzMargin - vertMargin / 2);
ViewHelper.setTranslationX(view, horzMargin - vertMargin / 2);
} else {
// view.setTranslationX(-horzMargin + vertMargin / 2);
ViewHelper.setTranslationX(view, -horzMargin + vertMargin / 2);
}
// Scale the page down (between MIN_SCALE and 1)
// view.setScaleX(scaleFactor);
// view.setScaleY(scaleFactor);
ViewHelper.setScaleX(view, scaleFactor);
ViewHelper.setScaleY(view, scaleFactor);
// Fade the page relative to its size.
// view.setAlpha(MIN_ALPHA +
// (scaleFactor - MIN_SCALE) /
// (1 - MIN_SCALE) * (1 - MIN_ALPHA));
ViewHelper.setAlpha(view, MIN_ALPHA +
(scaleFactor - MIN_SCALE) /
(1 - MIN_SCALE) * (1 - MIN_ALPHA));
} else { // (1,+Infinity]
// This page is way off-screen to the right.
// view.setAlpha(0);
ViewHelper.setAlpha(view, 0);
}
}
}
}
其他一切工作正常。我想实现这一点。请帮我。
在我不使用 NineOldroids 实施之前。但即使在实施后，它也没有奏效。