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我在viewpager中有3个选项卡。让我们打电话给他们标签A,B,C。每个选项卡都有自己的片段,我们称它们为frag1,frag2,frag3 。 我想用替换标签A中的frag1和新的碎片frag4,并保持viewpager中的其他标签不变。 我试过更换片段,但它不起作用。我是否需要在我的pageradapter中实现某些内容?如何在viewpager选项卡中的位置替换片段?
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private FragmentManager mFragmentManager;
private Fragment frag = null;
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
mFragmentManager = fm;
}
public void onSwitchToNextFragment() {
mFragmentManager.beginTransaction().remove(frag)
.commit();
if (frag instanceof Fragment1){
Log.v("here","swapping");
frag = Fragment4.newInstance();
}
Log.v("here","notified");
notifyDataSetChanged();
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
frag = Fragment1.newInstance();
Log.v("here","in getitem");
return frag;
default:
Log.v("here","in default");
return Fragment2.newInstance();
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
public void switchFrag(){
onSwitchToNextFragment();
// mFragmentManager.beginTransaction().replace(R.id.container,frag).commit();
// mFragmentManager.beginTransaction().add(frag).commit();
notifyDataSetChanged();
}