wil*_*lek 4 android android-fragments android-viewpager
我有一个有2页的viewpager,在每个片段上我放了一个按钮来切换片段,但如果我改变方向切换不起作用.使用我的OnChangePageButtonClick界面切换片段I为什么会发生这种情况?
ViewPager活动:
public class ViewPagerMusic extends FragmentActivity implements OnChangePageButtonClick {
private ViewPager vp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_pager_music);
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(super.getSupportFragmentManager(), fragments);
vp = (ViewPager)findViewById(R.id.viewpager);
vp.setAdapter(viewPagerAdapter);
}
private class ViewPagerAdapter extends FragmentStatePagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position) {
case 0:
MainPage mainPage = new MainPage();
mainPage.setOnChengeButtonListener(ViewPagerMusic.this);
return mainPage;
case 1:
PlaylistPage playlistPage = new PlaylistPage();
playlistPage.setOnChengeButtonListener(ViewPagerMusic.this);
return playlistPage;
}
return null;
}
@Override
public int getCount() {
return 2;
}
}
@Override
public void selectPage(int page) {
vp.setCurrentItem(page);
}
}
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我的Frgamnets:
public class MainPage extends Fragment {
public MainPage() {
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.music_main_page, container, false);
ImageButton btnPlaylist = (ImageButton)v.findViewById(R.id.btnGoPlaylist2);
btnPlaylist.setOnClickListener(onButtonListener);
return v;
}
private OnClickListener onButtonListener = new OnClickListener() {
@Override
public void onClick(View view) {
onChangePageButtonClick.selectPage(1);
}
};
public void setOnBackButtonListener(OnChangePageButtonClick onChangePageButtonClick) {
this.onChangePageButtonClick = onChangePageButtonClick;
}
private OnChangePageButtonClick onChangePageButtonClick;
}
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播放列表片段类似于MainPage片段.
您的片段正在存储对ViewPagerMusic活动的引用.但是,在轮换之后,活动将被销毁并重新创建,因此片段现在包含对旧活动的引用.
您可以从片段中调用活动的方法,而不是存储对活动的引用,如下所示:
((ViewPagerMusic) getActivity()).selectPage(1);
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只需在视图分页器中创建此方法
@Override
public void selectPage(int page) {
vp.setCurrentItem(page);
}
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然后在您的onclick方法中调用它
((ViewPagerMusic)getActivity())。selectPage(1);
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