我想改变ViewPager的高度，因为它包含了一些高度不同的子项。我已经了解到wrap_content对于ViewPager是不可行的，因此我想在运行时更改其高度。 我尝试过以下代码，但没有效果：
pager.getLayoutParams().height=1000;
请问有人可以提供帮助吗？
CustomViewPager.class
（自定义ViewPager类）public class CustomViewPager extends ViewPager {
/**
* Constructor
*
* @param context
* the context
*/
public CustomViewPager(Context context) {
super(context);
}
/**
* Constructor
*
* @param context
* the context
* @param attrs
* the attribute set
*/
public CustomViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = 0;
for (int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
child.measure(widthMeasureSpec,
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
int h = child.getMeasuredHeight();
if (h > height)
height = h;
}
heightMeasureSpec = MeasureSpec.makeMeasureSpec(height,
MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
XML文件：
<com.arsoft.ex.viewpager.CustomViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</com.arsoft.ex.viewpager.CustomViewPager>
主类：
tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
pager = (CustomViewPager) findViewById(R.id.viewPager);
adapter = new MyPagerAdapter(getSupportFragmentManager());
pager.setAdapter(adapter);
final int pageMargin = (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 4, getResources()
.getDisplayMetrics());
pager.setPageMargin(pageMargin);
tabs.setViewPager(pager);
FragmentPagerAdapter:
public class MyPagerAdapter extends FragmentPagerAdapter {
private final String[] TITLES = { "Cook", "Recipe", "Comments" };
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
@Override
public int getCount() {
return TITLES.length;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0: **pager.getLayoutParams().height=100;**
return CookCardFragment.newInstance(position, pager);
case 1: **pager.getLayoutParams().height=400;**
return RecipeCardFragment.newInstance(position, pager);
case 2: **pager.getLayoutParams().height=1000;**
return CookCardFragment.newInstance(position, pager);
}
return null;
}
}