ViewPager不支持layout_height = wrap_content

Question

我正在使用以下布局构建一个Android应用程序.

众所周知,layout_height="wrap_content"这对ViewPager不起作用.

我的问题是如何动态地改变它.ViewPager的内容是从两个xml布局中膨胀的,vp_statistics.xml and vp_campaigns.xml.

这是ViewPager的xml

<LinearLayout
            android:id="@+id/topcontent_wrapper"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="vertical" >
</LinearLayout>

<LinearLayout
            android:id="@+id/viewpager_wrapper"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="vertical" >

            <android.support.v4.view.ViewPager
                android:id="@+id/viewpager"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
</LinearLayout>

这是我的PagerAdapter的代码

class MyPagerAdapter extends PagerAdapter{

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return 2;
}

public Object instantiateItem(View collection, int pos){
    LayoutInflater inflater =     (LayoutInflater)collection.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    int resId = 0;
    switch(pos){
    case 0:
        resId = R.layout.vp_statistics;
        break;
    case 1:
        resId = R.layout.vp_campaigns;
        break;
    }

    View view = inflater.inflate(resId, null);


    ((ViewPager)collection).addView(view, 0);

    return view;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    // TODO Auto-generated method stub
    ((ViewPager)container).removeView((View)object);
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {
    // TODO Auto-generated method stub
    return arg0 == ((View)arg1);
}

@Override
public Parcelable saveState() {
    // TODO Auto-generated method stub
    return null;
}

}

在我的Activity类的onCreate()方法中:

MyPagerAdapter adapter = new MyPagerAdapter();
ViewPager viewPager = (ViewPager)findViewById(R.id.viewpager);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(0);

有没有办法获得vp_statistics.xml和vp_campaigns.xml布局的高度,并动态分配给ViewPager (@id/viewpager)每次instantiateItem()调用对象？

Answer 1

1. 将weightSum=2属性添加到父级LinearLayout,然后进行设置orientation=vertical.
2. 设置顶级子LinearLayout layout_weight=1.另外,设置layout_height=0dip
3. LinearLayout使用layout_weight=1和将ViewPager包装到另一个layout_height=0dip

Answer 2

使用0dp代替wrap_content, 并动态更改

pager = new ViewPager(this);
        pager.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));