我遇到了一个关于FragmentPagerAdapter的奇怪问题。
MainActivity.java
@SuppressLint("ValidFragment")
public class MainActivity<DashboardActivity> extends FragmentActivity implements ActionBar.TabListener {
...
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(0)).setTabListener(this).setIcon(R.drawable.rating_good));
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(1)).setTabListener(this).setIcon(R.drawable.action_search));
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(2)).setTabListener(this).setIcon(R.drawable.action_search));
}
...
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
public Fragment getItem(int position) {
Fragment fragment = null;
switch(position) {
case 0:
fragment = new Fragment0();
break;
case 1:
fragment = new Fragment1();
break;
case 2:
fragment = new Fragment2();
break;
}
return fragment;
}
@Override
public int getCount() {
return 3;
}
/*
* Title
*/
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section0).toUpperCase(l);
case 1:
return getString(R.string.title_section1).toUpperCase(l);
case 2:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
当我尝试在3个选项卡之间切换时,public Fragment getItem(int position)返回错误的位置。当我创建只有2个选项卡的应用程序时,一切正常。添加超过2个选项卡会导致奇怪的问题。 从0切换到1位置-正常工作,从1切换到0位置-正常工作,从1切换到2位置-正常工作,但是,当我尝试从2返回到1位置时,public Fragment getItem(int position)-int位置返回“0”而不是“1”。 有人能帮我解决这个问题吗?