Question

我想从activity创建FragmentPagerAdapter适配器。我怎么能这样做？

当我从一个片段调用时，我已经使用过这种方式，但现在我想要一个活动。

MyActivity.java

        // here error
            adapter = new FragmentPagerAdapter(getFragmentManager(),
                    images.getImageItem());
            viewPage.setAdapter(adapter);
            viewPage.setOnPageChangeListener(this);

FragmentPagerAdapter.java

public class FragmentPagerAdapter extends FragmentStatePagerAdapter {

private ArrayList<String> itemData;

public FragmentPagerAdapter(FragmentManager fm,
        ArrayList<String> itemData) {
    super(fm);
    this.itemData = itemData;
}
@Override
public int getCount() {
    return itemData.size();
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    super.destroyItem(container, position, object);
}
@Override
public Fragment getItem(int position) {
    FragmentImageView f = FragmentImageView.newInstance();
    f.setImageList(itemData.get(position));
    return f;
}
}

Answer 1

替换

str('abc').upper()  # returns 'ABC'

带

adapter = new FragmentPagerAdapter(getFragmentManager(),images.getImageItem());

adapter = new FragmentPagerAdapter(getSupportFragmentManager(), images.getImageItem());是getSupportFragmentManager的方法，不属于FragmentActivity，因此您的活动类必须实现Activity。请注意，您应该导入包FragmentActivity，不是com.support.v4.app.FragmentManager。

Answer 2

而不是getFragmentManager来电getSupportFragmentManager

 /**
     * Return the FragmentManager for interacting with fragments associated
     * with this activity.
     */
    public FragmentManager getSupportFragmentManager() {
        return mFragments.getSupportFragmentManager();
    }

所以你的代码将是

 adapter = new FragmentPagerAdapter(getSupportFragmentManager(),
                    images.getImageItem());
            viewPage.setAdapter(adapter);
            viewPage.setOnPageChangeListener(this);

从活动中调用FragmentPagerAdapter

2 个答案: