我正在尝试实现如下图所示的滚动条。
我尝试过使用 viewpager,但它一次只显示一项。我需要展示其中的 5 个不同尺寸的。中间的那个需要更大一些。
每个 Item 都是一个包含 ImageView 和 TexView 的 frameLayout,我在实现该部分时没有任何问题。问题是它需要是一个滚动条并且在滚动条中有很多项目,例如最多 15 个。但是在任何时候都应该只有 5 个项目可见,如下所示。我尝试了很多实现。请有人给我一个工作示例,因为我已经尝试了很多示例,但没有一个可以完美运行。我已经为此浪费了一个多星期。
最佳答案
您可以通过覆盖 PagerFragmentAdapter 中的 getPageWidth() 来控制它:
@Override
public float getPageWidth(int position) {
return(0.4f);
}
并确保您的图片尺寸不会太大,以便页面宽度适合多张图片。
以下是设置它的所有步骤:
1) 将 fragment 容器添加到您的 Activity 布局,您将在其中加载 PhotoPagerFragment:
<!-- PHOTO PAGER FRAGMENT -->
<FrameLayout
android:id="@+id/photoPagerFragmentContainer"
android:layout_width="match_parent"
android:layout_height="150dp"
android:tag="sticky"
android:layout_gravity="center_horizontal" >
</FrameLayout>
2) 在您的 Activity 的 onCreate()
中注入(inject) PhotoPagerFragment:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_layout);
//Insert the fragment
FragmentManager fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.photoPagerFragmentContainer);
if (fragment == null) {
fragment = new PhotoPagerFragment();
fm.beginTransaction()
.add(R.id.photoPagerFragmentContainer, fragment)
.commit();
}
}
3) 为您的 PhotoPagerFragment 创建布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/black"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="@+id/photoPager"
android:layout_width="fill_parent"
android:layout_height="120dp"
android:layout_marginTop="2dp"/>
</LinearLayout>
4) 创建您的 PhotoPagerFragment:
public class PhotoPagerFragment extends Fragment {
private ViewPager mPhotoPager;
private PagerAdapter mPhotoAdapter;
public static final String TAG = "PhotoPagerFragment";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_photo_pager, container, false);
mPhotoAdapter = new PhotoPagerFragmentAdapter(getActivity().getSupportFragmentManager());
mPhotoPager = (ViewPager) view.findViewById(R.id.photoPager);
mPhotoPager.setAdapter(mPhotoAdapter);
return view;
}
}
5) 和适配器:
public class PhotoPagerFragmentAdapter extends FragmentPagerAdapter {
private int[] Images = new int[] {
R.drawable.photo_1, R.drawable.photo_2,
R.drawable.photo_3, R.drawable.photo_4,
R.drawable.photo_5, R.drawable.photo_6
};
private int mCount = Images.length;
public PhotoPagerFragmentAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return PhotoDetailsFragment.newInstance(Images[position]);
}
@Override
public int getCount() {
return mCount;
}
@Override
public float getPageWidth(int position) {
return(0.4f);
}
public void setCount(int count) {
if (count > 0 && count <= 10) {
mCount = count;
notifyDataSetChanged();
}
}
}
6) 最后,您的 PhotoDetailsFragment 将显示每张图片:
public final class PhotoDetailsFragment extends Fragment {
private int photoResId;
private static final String TAG = "PhotoDetailsFragment";
public static final String EXTRA_PHOTO_ID = "com.sample.photo_res_id";
public static PhotoDetailsFragment newInstance(int photoResId) {
Bundle args = new Bundle();
args.putSerializable(EXTRA_PHOTO_ID, photoResId);
PhotoDetailsFragment fragment = new PhotoDetailsFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
photoResId = (Integer)getArguments().getSerializable(EXTRA_PHOTO_ID);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final ImageView image = new ImageView(getActivity());
image.setImageResource(photoResId);
// Hook up the clicks on the thumbnail views
image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
...
}
});
LinearLayout layout = new LinearLayout(getActivity());
layout.setLayoutParams(new LayoutParams(-1, -1));
layout.setGravity(Gravity.CENTER);
layout.addView(image);
return layout;
}
}
关于android - android中的画廊类型 ScrollView ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20858825/