Android - 在運行時更改ViewPager的高度

Question

我想更改ViewPager的高度，因爲它包含一些高度不同的孩子。我讀過wrap_content不可能用於ViewPager，所以我想在運行時改變它的高度。 我都試過，但它不工作：

pager.getLayoutParams().height=1000; 

可能有人提供幫助嗎？

CustomViewPager.class

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> 

MainClass：

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; 
    } 

} 

Answer 1

我以前見過這個問題。 也許你可以使用fumction這樣的：

ViewPager vp = (CustomViewPager) findViewById(R.id.viewPager); 
... 
ViewGroup.LayoutParams params = vp.getLayoutParams(); 
params.height = 1000; 
vp.setLayoutParams(params); 

Answer 2

檢查我的回答，我能夠改變ViewPager的高度，當您更改頁面或改變它的高度子

https://stackoverflow.com/a/25710358/1835245