Adapter
public class AdvViewPagerAdapter extends FragmentPagerAdapter { private Context context; private Listurls; private List imgs; private List fragments; public AdvViewPagerAdapter(FragmentManager fm, Context context, List urls) { super(fm); this.context = context; this.urls = urls; // imgs = new ArrayList (); fragments = new ArrayList (); for (String url : urls) { MyImageFragment fragment = new MyImageFragment(context, url); fragments.add(fragment); } } @Override public int getCount() { return urls.size(); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public Fragment getItem(int position) { MLog.i(fragments.get(position)); return fragments.get(position); } }
Fragment
class MyImageFragment extends BaseFragment { private View view; private ImageView mImageView; private String url; public MyImageFragment(Context context, String url) { super(context); this.url = url; } @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { view = getLayout(inflater, container, R.layout.image_layout, false); initView(); Picasso.with(getContext()).load(url).into(mImageView); return view; } @Override public void initView() { mImageView = (ImageView) view.findViewById(R.id.image_layout_iv); } }
R.layout.image_layout
Test代码
public class WelcomeActivity extends BaseActivity { private ViewPager viewpager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_welcome); initView(); } @Override public void initView() { viewpager = (ViewPager) findViewById(R.id.viewpager); Listurls = new ArrayList (); urls.add("http://hiphotos.baidu.com/baidu/pic/item/4ec2d5628535e5dd3c10363671c6a7efce1b621f.png"); urls.add("http://hiphotos.baidu.com/baidu/pic/item/a8ec8a13632762d07842064fa6ec08fa503dc6c6.png"); urls.add("http://fanyi.baidu.com/static/translation/img/footer/app_e8ff780.png"); viewpager.setAdapter(new AdvViewPagerAdapter(getSupportFragmentManager(), getContext(), urls)); } }
!BaseActivity 继承自
android.support.v4.app.FragmentActivity
!BaseFragment 继承自
android.support.v4.app.Fragment
fragmentment没复写getItem()所以得不到子每个pager需要加载的fragment。
你的initView()方法在父类BaseFragment中有调用吗?还是单纯的抽象?在fragment中,context最好使用getActivity()来获取,会对Picasso友好一些,即Picasso.with(getActivity()),可以先试一下。
Fragment不是不建议有参的构造吗?另外毕加索的用法是,尽量定出长宽,如果不定的话用自动适配,比如:
Picasso.with(context) .load(url) .placeholder(res_holder) .error(res_holder) .config(Bitmap.Config.RGB_565) .fit() .centerInside() .into(view);
建议Picasso尽量设置详细点,有助于显示和控制。如果你说的空白,就是说连imageView的背景都没显示的话,还需查看Acitivty里面的代码,看是否是设置有问题。
该问题已关闭_(:3」∠)_