Question

我找到了一个使用片段而不使用tabBar的示例但现在我发现一个片段OnCreatView调用了previos片段，并且我对片段的生命周期没有任何控制

这是我的代码

public class AddTextActivity AppCompatActivity {

private PagerAdapter mPagerAdapter;
public static FragmentManager frmanager;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.cordinate);


    frmanager=getSupportFragmentManager();
    initialisePaging();


}

private void initialisePaging() {

    List<Fragment> fragments = new Vector<>();
    fragments.add(Fragment.instantiate(this,Frags.Addtext1.class.getName()));
    fragments.add(Fragment.instantiate(this,Frags.Addtext2.class.getName()));
    fragments.add(Fragment.instantiate(this,Frags.Addtext3.class.getName()));


    this.mPagerAdapter  = new PagerAdapter1(frmanager, fragments);

    ViewPager pager = (ViewPager)super.findViewById(R.id.viewpager);
    pager.setAdapter(this.mPagerAdapter);
}

这是pagerAdapter1

public class PagerAdapter1 extends FragmentPagerAdapter {

private List<Fragment> fragments;
/**
 * @param fm
 * @param fragments
 */
public PagerAdapter1(FragmentManager fm, List<Fragment> fragments) {
    super(fm);
    this.fragments = fragments;
}
/* (non-Javadoc)
 * @see android.support.v4.app.FragmentPagerAdapter#getItem(int)
 */
@Override
public Fragment getItem(int position) {
    return this.fragments.get(position);
}

/* (non-Javadoc)
 * @see android.support.v4.view.PagerAdapter#getCount()
 */
@Override
public int getCount() {
    return this.fragments.size();
}

}

所以现在我怎么能阻止调用下一个片段的onCreatView？

Answer 1

确定选择了哪个页面：

   mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
           // TODO insert your code here
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

片段的OnCreatView函数在previos片段上调用

1 个答案: