可以使用FragmentPagerAdapter.getPageWidth 在 ViewPager 中缩放页面。您将需要一个自定义 FragmentPagerAdapter。如果返回一个介于 0 和 1 之间的数字，则页面会缩小，宽度 > 1 会相应地放大页面。但这并不是很好，因为您无法在放大后的页面中滚动图像。
如果您将 ImageView 包装在 HorizontalScrollView 中，情况会好一些，您可以在页面内滚动图像，但如果您不是很快，页面之间的滑动手势会被 HorizontalScrollView 捕获。见this video。
因此，真正的解决方案是使用自定义的 HorizontalScrollView（参见 InterceptingHorizontalScrollView），它不允许拦截 onTouch 事件，但在用户滚动到末尾时也允许它（参见覆盖的 onOverScrolled）。请参阅this video 或下图了解区别。
编辑你不需要重写onInterceptTouchEvent，因为HorizontalScrollView默认拦截它们（所以滚动图片比分页优先级更高。）
最后，所有代码如下：
MainActivity.java
public class MainActivity extends Activity {
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the ViewPager
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setPageMargin(30);
mViewPager.setAdapter(new ImagePagerAdapter(getFragmentManager()));
}
private class ImagePagerAdapter extends FragmentPagerAdapter {
public ImagePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
switch(i) {
case 0:
return ImageFragment.newInstance(R.drawable.forest1);
case 1:
return ImageFragment.newInstance(R.drawable.forest2);
case 2:
return ImageFragment.newInstance(R.drawable.forest3);
default:
return ImageFragment.newInstance(R.drawable.ic_launcher);
}
}
@Override
public int getCount() {
return 3;
}
@Override
public float getPageWidth(int position)
{
// Here it is possible to scale page width
return super.getPageWidth(position);
}
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
ImageFragment.java
public class ImageFragment extends Fragment {
private static final String ARG_PARAM1 = "image_resid";
private int mImageResId;
public static ImageFragment newInstance(int image_resid) {
ImageFragment fragment = new ImageFragment();
Bundle args = new Bundle();
args.putInt(ARG_PARAM1, image_resid);
fragment.setArguments(args);
return fragment;
}
public ImageFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mImageResId = getArguments().getInt(ARG_PARAM1);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_image, container, false);
ImageView imageView = (ImageView)v.findViewById(R.id.imageView);
imageView.setImageResource(mImageResId);
return v;
}
}
fragment_image.xml
<com.gyebro.viewpagertest.InterceptingHorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="600dp"
android:layout_height="match_parent"
tools:context="com.gyebro.viewpagertest.ImageFragment">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:id="@+id/imageView"
android:src="@drawable/forest1" />
</com.gyebro.viewpagertest.InterceptingHorizontalScrollView>
InterceptingHorizontalScrollView.java
public class InterceptingHorizontalScrollView extends HorizontalScrollView {
public InterceptingHorizontalScrollView(Context context) {
super(context);
}
public InterceptingHorizontalScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public InterceptingHorizontalScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
/*@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (getParent() != null) {
switch (ev.getAction()) {
case MotionEvent.ACTION_MOVE:
getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
getParent().requestDisallowInterceptTouchEvent(false);
break;
}
}
return super.onInterceptTouchEvent(ev);
}*/
@Override
protected void onOverScrolled (int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
super.onOverScrolled(scrollX,scrollY,clampedX,clampedY);
// if clampedX == true, we've reached the end of the HorizontalScrollView so
// allow parent to intercept
if(clampedX) {
Log.d("InterceptingHorizontalScrollView", "Reached the end, allowing interception");
getParent().requestDisallowInterceptTouchEvent(false);
}
}
}