MainActivity→Fragment1→Fragment2
の順で表示されるアプリを作成しております。
戻るボタンを押すことで、逆順に戻るようにしたいのですが、
Fragment2で戻るボタンを押すとFragment1について何も表示されなくなってしまいます。
デバックしてみたところ、戻るボタンを押した際に、MainActivityのonBackPressedメソッドが呼ばれていることは確認できていますので、Fragment2→Fragment1に遷移はできていると思われます。そのため、戻ってきた際にFragment1#onCreateViewメソッドが呼ばれていないということなのでしょうか。
原因について、わかる方がいらっしゃれば教えていただきたいです。
よろしくお願いします。
Java
1 2 3import android.support.v4.app.FragmentManager; 4import android.support.v4.app.FragmentTransaction; 5import android.support.v7.app.AppCompatActivity; 6import android.os.Bundle; 7 8public class MainActivity extends AppCompatActivity { 9 10 @Override 11 protected void onCreate(Bundle savedInstanceState) { 12 super.onCreate(savedInstanceState); 13 setContentView(R.layout.activity_main); 14 15 if(savedInstanceState == null){ 16 FragmentManager fragmentManager = getSupportFragmentManager(); 17 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 18 fragmentTransaction.addToBackStack(null); 19 fragmentTransaction.replace(R.id.container, new Fragment1()); 20 fragmentTransaction.commit(); 21 } 22 } 23 24 @Override 25 public void onBackPressed() { 26 FragmentManager fragmentManager = getSupportFragmentManager(); 27 if(fragmentManager != null) { 28 fragmentManager.popBackStack(); 29 } 30 super.onBackPressed(); 31 } 32}
Java
1 2import android.os.Bundle; 3import android.support.v4.app.Fragment; 4import android.support.v7.widget.LinearLayoutManager; 5import android.support.v7.widget.RecyclerView; 6import android.view.LayoutInflater; 7import android.view.View; 8import android.view.ViewGroup; 9import android.widget.Button; 10 11import java.util.ArrayList; 12 13 14public class Fragment1 extends Fragment { 15 16 private RecyclerView mRecyclerView; 17 private RecyclerView.Adapter mAdapter; 18 private RecyclerView.LayoutManager mLayoutManager; 19 public static int click_pos; 20 21 ArrayList<UserDataBean> userDataBeanList = new ArrayList<UserDataBean>(); 22 23 24 public Fragment1() { 25 // Required empty public constructor 26 } 27 28 @Override 29 public void onCreate(Bundle savedInstanceState) { 30 super.onCreate(savedInstanceState); 31 32 } 33 34 @Override 35 public View onCreateView(LayoutInflater inflater, ViewGroup container, 36 Bundle savedInstanceState) { 37 38 View view = inflater.inflate(R.layout.fragment_friend_list, container, false); 39 40 mRecyclerView = view.findViewById(R.id.my_recycler_view); 41 42 mRecyclerView.setHasFixedSize(true); 43 44 mLayoutManager = new LinearLayoutManager(getActivity()); 45 46 mRecyclerView.setLayoutManager(mLayoutManager); 47 48 UserDataBean userDataBean = ・・・ 49 userDataBeanList.add(userDataBean); 50 ・・・・ 51 userDataBeanList.add(userDataBean); 52 53 mAdapter = new Adapter1(userDataBeanList,getActivity()); 54 mRecyclerView.setAdapter(mAdapter); 55 56 return view; 57 } 58} 59
Java
1 2import android.content.Context; 3import android.support.v4.app.FragmentManager; 4import android.support.v4.app.FragmentTransaction; 5import android.support.v7.widget.RecyclerView; 6import android.view.LayoutInflater; 7import android.view.View; 8import android.view.ViewGroup; 9import android.widget.ImageView; 10import android.widget.TextView; 11import android.widget.Toast; 12 13import java.util.ArrayList; 14 15 16public class Adapter1 extends RecyclerView.Adapter<Adapter1.ViewHolder> implements View.OnClickListener { 17 18 private ArrayList<UserDataBean> userDataBeanList; 19 private Context context; 20 21 public Adapter1(ArrayList<UserDataBean> userDataBeanList, Context context) { 22 this.userDataBeanList = userDataBeanList; 23 this.context = context; 24 } 25 26 27 static class ViewHolder extends RecyclerView.ViewHolder { 28 ImageView imageView; 29 TextView textView; 30 TextView messageView; 31 32 ViewHolder(View v) { 33 super(v); 34 imageView = v.findViewById(R.id.image_view); 35 textView = v.findViewById(R.id.text_view); 36 messageView = v.findViewById(R.id.email_view); 37 } 38 } 39 40 @Override 41 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 42 View view = LayoutInflater.from(parent.getContext()) 43 .inflate(R.layout.list_items, parent, false); 44 45 return new ViewHolder(view); 46 47 } 48 49 @Override 50 public void onBindViewHolder(final ViewHolder holder, int position) { 51 holder.imageView.setImageResource(userDataBeanList.get(position).getPhotos()); 52 holder.textView.setText(userDataBeanList.get(position).getUserName()); 53 holder.messageView.setText(userDataBeanList.get(position).getMessage()); 54 55 holder.imageView.setOnClickListener(this); 56 holder.textView.setOnClickListener(this); 57 holder.messageView.setOnClickListener(this); 58 } 59 60 @Override 61 public int getItemCount() { 62 return userDataBeanList.size(); 63 } 64 65 @Override 66 public void onClick(View v) { 67 FragmentManager fragmentManager = ((MainActivity)context).getSupportFragmentManager(); 68 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 69 fragmentTransaction.addToBackStack(null); 70 fragmentTransaction.replace(R.id.container, new TalkFragment()); 71 fragmentTransaction.commit(); 72 } 73}
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2019/08/25 02:47 編集
2019/08/27 12:04
2019/08/29 12:57