从活动中调用一个片段

Question

我是android开发中的新成员。 我有一个活动和两个fragments.in第二个片段（EditProfileFragment）我有一个联系信息更新称为UPDATE的按钮。 我想单击更新按钮后，第一个片段（ProfileFragment）被替换为第二个片段（EditProfileFragment）。 的活动我用两个片段是这样的：

private void initFragment() { 
    fragments = new Vector<>(); 
    fragments.add(Fragment.instantiate(this, ProfileFragment.class.getName())); 
    fragments.add(Fragment.instantiate(this, EditProfileFragment.class.getName())); 
    adapterFragment = new PagerAdapterFragment(this.getSupportFragmentManager(), fragments); 
    ViewPager pager = (ViewPager) findViewById(R.id.vpg_main_content); 
    pager.setAdapter(adapterFragment); 

} 


private ProfileFragment getProfileFragment() { 
    if (profileFragment == null) { 
     profileFragment = (ProfileFragment) fragments.get(0); 
    } 
    return profileFragment; 
} 

private EditProfileFragment getEditProfileFragment() { 
    if (editProfileFragment == null) { 
     editProfileFragment = (EditProfileFragment) fragments.get(1); 
    } 
    return editProfileFragment; 
} 

和我的片段适配器：

public class PagerAdapterFragment extends FragmentPagerAdapter { 
private final List<Fragment> fragments; 
public PagerAdapterFragment(FragmentManager fm, 
List<Fragment> fragments) { 
super(fm); 
this.fragments = fragments; 
} 
@Override 
public Fragment getItem(int position) { 
return this.fragments.get(position); 
} 
@Override 
public int getCount() { 
return this.fragments.size(); 
} 
} 

这是我的更新语句：

 fragmentEditBtUpdate.setOnClickListener(
     new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
     id = contact.get_id(); 
     name = fragmentEditEditTextName.getText().toString(); 
     family = fragmentEditEditTextFamily.getText().toString(); 
     phoneNumber = fragmentEditEditTextPhoneNumber.getText().toString(); 
     contact = new Contact(id, name, family, phoneNumber, 
     mCurrentImagePath); 
     rowUpdate = 
     App.getInstanceImplementation().updateContact(contact); 
      Log.i("==>", "btnUpdateContact: " + rowUpdate); 
     editFragmentCallBack.setCurrentFragmentPosition(); 

     } 
    }); 

我EditProfileFragment创建回调监听：

public interface EditFragmentCallBack 
    { 
    Contact getContact(); 
    void finishProfile(); 
    void setCurrentFragmentPosition(); 
    } 

和活动实施：

@Override 
public void setCurrentFragmentPosition() { 
getSupportFragmentManager().beginTransaction().replace(R.id.vpg_main_content,profileFragment); 
} 

这是活动布局：

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true" 
tools:context="com.example.sayres.myapplication7.mvp.view.profile.ProfileActivity"> 

<android.support.design.widget.AppBarLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" /> 

</android.support.design.widget.AppBarLayout> 

<android.support.v4.view.ViewPager 
    android:id="@+id/vpg_main_content" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/> 

，但是当我点击按键，调editFragmentCallBack.setCurrentFragmentPosition();，没有任何反应！ 您的意见是什么？

Answer 1

我做了一些常e在我的程序结构和Use View View Pager setCurrentItem（）方法中，我终于可以解决我的问题了。这个链接对我非常有帮助。 guides.codepath.com

Answer 2

如果用beginTransaction()初始化事务应该由commit()

承诺呢？所以用这个

FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
fragmentTransaction.replace(R.id.vpg_main_content,profileFragment); 
fragmentTransaction.commit(); 

放入setCurrentFragmentPosition()和替换

getSupportFragmentManager().beginTransaction().replace(R.id.vpg_main_content,profileFragment); 

编辑

private void initFragment() { 
    List<Fragments> fragments=new ArrayList<> //declare it as global 
    fragments.add(new ProfileFragment.class); 
    fragments.add(new EditProfileFragment.class); 
    adapterFragment = new PagerAdapterFragment(this.getSupportFragmentManager(), fragments); 
    ViewPager pager = (ViewPager) findViewById(R.id.vpg_main_content); 
    pager.setAdapter(adapterFragment); 

} 


private ProfileFragment getProfileFragment() { 
    if (profileFragment == null) { 
     profileFragment = (ProfileFragment) fragments.get(0); 
    } 
    return profileFragment; 
} 

private EditProfileFragment getEditProfileFragment() { 
    if (editProfileFragment == null) { 
     editProfileFragment = (EditProfileFragment) fragments.get(1); 
    } 
    return editProfileFragment; 
} 

参考this

Answer 3

在你的Activity类，你想要去的片段

活动课

FragmentClass fragClass = FragmentClass.newInstance(You can send any data to fragment class); 
fragClass.show(getActivity().getFragmentManager(), ""); 

片段类

public static FragmentClass newInstance(Get Any Data from Activity Class) { 
    FragmentClass fragClass = new FragmentClass(); 

    return fragClass; 
    }