0
我使用ViewPager顯示歡迎,註冊和其他一些屏幕。這些屏幕是由FragmentStatePagerAdapter控制片段:Picasso:java.lang.IllegalArgumentException:目標不能爲空
private static class TourPagerAdapter extends FragmentStatePagerAdapter {
public TourPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
WellcomeTourFragment ta = null;
switch (position) {
case 0:
ta = WellcomeTourFragment.newInstance(R.layout.welcome_fragment);
break;
case 1:
ta = WellcomeTourFragment.newInstance(R.layout.signup_fragment);
break;
第一片段(WellcomeFragment)顯示使用畢加索庫從網上下載了一些看法和背景圖片:
private ImageView bkgImage;
public static WellcomeTourFragment newInstance(int layoutId){
WellcomeTourFragment pane = new WellcomeTourFragment();
Bundle args = new Bundle();
args.putInt(LAYOUT_ID, layoutId);
pane.setArguments(args);
return pane;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final ViewGroup rootView = (ViewGroup) inflater.inflate(getArguments().getInt(LAYOUT_ID, -1), container, false);
this.bkgImage = (ImageView) rootView.findViewById(R.id.imgView_Background);
return rootView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Picasso.with(getActivity())
.load(IMG_uRL)
.into(this.bkgImage);
}
這裏我的問題是,我得到
java.lang.IllegalArgumentException:目標不能爲空。
我確定ImageView確實退出了我的welcome_fragment佈局。但真的不知道是什麼讓目標爲空。
請包含您的welcome_fragment佈局 –
您確定'rootView.findViewById(R.id.imgView_Background)'不會返回null嗎? –