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我在其中有一个名为 RegisterActivity 的 Activity ，我正在实现包含两个 fragment 的 ViewPager。这是 Activity 代码
public class RegisterActivity extends AppCompatActivity{
private Context context;
private Toolbar toolbar;
private TabLayout tabLayout;
public static ViewPager viewPager;
private ViewPagerAdapter adapter;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
context = RegisterActivity.this;
viewPager = findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new FragmentOne(), "Step 1");
adapter.addFragment(new FragmentTwo(), "Step 2");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> fragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
@Override
public int getCount() {
return fragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
fragmentList.add(fragment);
fragmentTitleList.add(title);
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return fragmentTitleList.get(position);
}
}
第一个 fragment 有一个 NEXT 按钮。按下此按钮时，我希望 View 寻呼机滚动到 FragmentTWo。同样，FragmentTwo 有一个 BACK 按钮，我希望 View 寻呼机在按下 BACK 按钮(存在于 FragmentTwo 布局中)时滚动到 fragmentOne。