onPageScrolled()没有被调用

我正在努力熟悉ViewPager。 我的代码如下。 问题是没有调用onPageChangeListener方法。 可能是什么问题?

public class TabsViewPagerFragmentActivity extends SherlockFragmentActivity implements ViewPager.OnPageChangeListener { private ViewPager mViewPager; private PagerAdapter mPagerAdapter; private PageIndicator mIndicator; private static final String[] CONTENT = new String[] { "Home", "Popular", "Chat", "Profile"}; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ActionBar bar = getSupportActionBar(); View customview = LayoutInflater.from(this).inflate(R.layout.actionbar_custom_layout, null); ImageView im = (ImageView)customview.findViewById(R.id.add); /*im.getLayoutParams().height = h; im.getLayoutParams().width = h;*/ bar.setCustomView(customview); bar.setDisplayShowCustomEnabled(true); bar.setDisplayShowTitleEnabled(false); bar.setDisplayShowHomeEnabled(false); // Inflate the layout setContentView(R.layout.tabs_viewpager_layout); // Intialise ViewPager this.intialiseViewPager(); mIndicator = (TitlePageIndicator)findViewById(R.id.titles); mIndicator.setViewPager(mViewPager); TitlePageIndicator indicator = (TitlePageIndicator)findViewById(R.id.titles); indicator.setTextColor(0xAAfb891e); indicator.setSelectedColor(0xFFfb891e); } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add("Search") .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT); return true; } public int getCount() { return CONTENT.length; } protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); } private void intialiseViewPager() { this.mPagerAdapter = new PagerAdapter(super.getSupportFragmentManager(), fragments); this.mViewPager = (ViewPager)super.findViewById(R.id.viewpager); this.mViewPager.setAdapter(this.mPagerAdapter); this.mViewPager.setOnPageChangeListener(this); } public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { // TODO Auto-generated method stub System.out.println(positionOffsetPixels); } public void onPageSelected(int position) { // TODO Auto-generated method stub System.out.println(position); } public void onPageScrollStateChanged(int state) { // TODO Auto-generated method stub System.out.println(state); } } 

我的意思是我在滚动页面时没有在Logcat中打印任何内容。

Solutions Collecting From Web of "onPageScrolled()没有被调用"

好吧,我在一些试错后自己解决了这个问题。

自从我引入TitlePagerIndicator’mIndicator’以来,我不得不调用mIndicator.setOnPageChangeListener(this); 而不是mViewPager.setOnPageChangeListener(this);

System.out流不会打印到Logcat。 使用Log类代替Log.d("MyApp","message")

您编写代码的方式我猜您正在实现ViewPager.OnPageChangeListener

更改

this.mViewPager.setOnPageChangeListener(mIndicator);

this.mViewPager.setOnPageChangeListener(this);

我按照上面的提示,但不适合我。 在我的例子中,我使用了: mIndicator.setCurrentItem(position);

这可以帮助别人!