@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_dictionary);
getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
setupNavMenu();
}
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new A(), "A");
adapter.addFragment(new B(), "B");
adapter.addFragment(new C(), "C");
adapter.addFragment(new D(), "D");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
问题是:当我启动活动时,我会得到第一个片段的视图(A),但下一个片段(B)没有加载视图,因此当我滑动到下一个视图(B)时,我得到了在前一个片段中加载的视图,所以现在它加载了片段C......
问题在于片段B的内容取决于片段A中的输入(数据保存在共享首选项中),因此我总是在片段B中获得默认值,因为它在片段A中被加载。
当我在片段D中时,这个错误也是一样的,所以当我向左滑动到片段C时,它将显示片段C并且还会加载片段B。