app/src/main/java/com/example/childguard/GenerateQrFragment.java

@@ -1,12 +1,17 @@
 package com.example.childguard;
 
+import android.graphics.Bitmap;
+import android.graphics.drawable.BitmapDrawable;
 import android.os.Bundle;
 
 import androidx.fragment.app.Fragment;
+import androidx.print.PrintHelper;
 
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.Toast;
 
 /**
  * A simple {@link Fragment} subclass.
@@ -18,9 +23,10 @@ public class GenerateQrFragment extends Fragment {
     public GenerateQrFragment() {
         // Required empty public constructor
     }
-    public static GenerateQrFragment newInstance() {
+    public static GenerateQrFragment newInstance(String key) {
         GenerateQrFragment fragment = new GenerateQrFragment();
         Bundle args = new Bundle();
+        args.putString("key", key);
         fragment.setArguments(args);
         return fragment;
     }
@@ -40,7 +46,24 @@ public class GenerateQrFragment extends Fragment {
     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
 
+        QrUtils qrUtils = new QrUtils();
 
+        assert getArguments() != null;
+        Bitmap result = qrUtils.setContext(getContext()).getBitmap(getArguments().getString("key"));
 
+        ImageView imageView = view.findViewById(R.id.result_bitmap_image_view);
+        imageView.setImageBitmap(result);
+
+        view.findViewById(R.id.button_print).setOnClickListener( v -> {
+            PrintHelper photoPrinter = new PrintHelper(requireContext());
+            photoPrinter.setScaleMode(PrintHelper.SCALE_MODE_FIT);
+            photoPrinter.printBitmap("placeholder", result, () -> {
+                Toast.makeText(getContext(), "印刷完了", Toast.LENGTH_SHORT).show();
+            });
+        });
+
+        view.findViewById(R.id.button_cancel).setOnClickListener( v -> {
+            getParentFragmentManager().popBackStack();
+        });
     }
 }

app/src/main/java/com/example/childguard/HomeFragment.java

@@ -134,7 +134,7 @@ public class HomeFragment extends Fragment implements OnEventListener{
         transaction.commit();
     }
 
-    private void updateUiState(boolean state) {
+    private boolean updateUiState(boolean state) {
         Log.d("HomeFragment", "updateUiState: called");
         // Init
         TextView tv;
@@ -144,10 +144,12 @@ public class HomeFragment extends Fragment implements OnEventListener{
             fl = requireView().findViewById(R.id.situation_bg);
         } catch (NullPointerException e) {
             Log.d("HomeFragment", "updateUiState: view is null");
-            return;
+            return false;
-        } catch (Exception e) {
+        } catch (IllegalStateException e) {
-            Log.d("HomeFragment", "updateUiState: unknown error");
+            Log.d("HomeFragment", "updateUiState: view is not attached");
-            return;
+//            getParentFragmentManager().beginTransaction().replace(R.id.fragmentContainerView, HomeFragment.newInstance("test", "test")).commit();
+//            updateUiState(state);
+            return false;
         }
         String get_on = "\n乗車状態";
         String get_off = "\n降車状態";
@@ -160,12 +162,14 @@ public class HomeFragment extends Fragment implements OnEventListener{
             fl.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.frame_style, null));
             tv.setText(get_off);
         }
+
+        return true;
     }
 
     @Override
-    public void onEvent(boolean state) {
+    public boolean onEvent(boolean state) {
         Log.d("HomeFragment", "onEvent: called");
-        updateUiState(state);
+        return updateUiState(state);
     }
 }
 

app/src/main/java/com/example/childguard/MainActivity.java

@@ -64,6 +64,8 @@ public class MainActivity extends AppCompatActivity {
     BluetoothManager bluetoothManager;
     BluetoothAdapter bluetoothAdapter;
 
+    DocumentReference mDocRef;
+
     private HomeFragment homeFragment;
 
     public static final String TAG = "InspirationQuote";
@@ -157,14 +159,22 @@ public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onResume() {
+        Log.d("onResume", "called");
+        if (mDocRef == null) {
+            Log.d("onResume", "mDocRef is null");
             SharedPreferences sharedPreferences = getSharedPreferences("app_situation", MODE_PRIVATE);
             String IdPref = sharedPreferences.getString("ID", null);
             if (IdPref == null) {
                 Log.d("onResume", "ID not initialized.");
                 return;
             }
-        DocumentReference mDocRef = FirebaseFirestore.getInstance().document("users/" + IdPref);//現在の位置を取得
+            mDocRef = FirebaseFirestore.getInstance().document("users/" + IdPref);//現在の位置を取得
             initNotification(mDocRef);
+        }
+
+        if (mDocRef.getId().equals(null)) {
+            Log.d("onResume", "mDocRef.getId() is null");
+        }
 
         super.onResume();
     }
@@ -205,8 +215,11 @@ public class MainActivity extends AppCompatActivity {
                             E.putBoolean("car", true);
                             E.apply();
                         }
-
+                        // SupportFragmentManagerが現在表示しているFragmentを取得
-                        homeFragment.onEvent(!isInCar);
+                        Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragmentContainerView);
+                        if (fragment instanceof HomeFragment) {
+                            ((HomeFragment) fragment).updateUiState(!isInCar);
+                        }
                     }
                 }
                 flg = true;

app/src/main/java/com/example/childguard/OnEventListener.java

@@ -2,5 +2,5 @@ package com.example.childguard;
 
 public interface OnEventListener {
 
-    void onEvent(boolean state);
+    boolean onEvent(boolean state);
 }

app/src/main/java/com/example/childguard/SettingFragment.java

@@ -74,10 +74,7 @@ public class SettingFragment extends Fragment {
                 Log.d("HomeFragment", "already printed");
                 //画面遷移＆ID受け渡し
                 Toast.makeText(getActivity(), "再印刷", Toast.LENGTH_SHORT).show();
-                QrUtils qrUtils = new QrUtils();
+                getParentFragmentManager().beginTransaction().addToBackStack(null).replace(R.id.fragmentContainerView, GenerateQrFragment.newInstance(sharedPreferences.getString("ID", "none"))).commit();
-                PrintHelper printHelper = new PrintHelper(requireContext());
-                printHelper.setScaleMode(PrintHelper.SCALE_MODE_FIT);
-                printHelper.printBitmap("QRコード", qrUtils.setContext(getContext()).getBitmap(sharedPreferences.getString("ID", "placeholder")), () -> Toast.makeText(getContext(), "印刷完了", Toast.LENGTH_SHORT).show());
             } else {
                 String valueParent = "placeholder";
                 String valueBorn = "placeholder";
@@ -107,15 +104,7 @@ public class SettingFragment extends Fragment {
                             editor.apply();
 
                             Toast.makeText(getActivity(), "初回登録", Toast.LENGTH_SHORT).show();
-                            QrUtils qrUtils = new QrUtils();
+                            getParentFragmentManager().beginTransaction().addToBackStack(null).replace(R.id.fragmentContainerView, GenerateQrFragment.newInstance(documentReference.getId())).commit();
-                            PrintHelper printHelper = new PrintHelper(requireContext());
-                            printHelper.setScaleMode(PrintHelper.SCALE_MODE_FIT);
-                            printHelper.printBitmap("QRコード", qrUtils.setContext(getContext()).getBitmap(documentReference.getId()), new PrintHelper.OnPrintFinishCallback() {
-                                @Override
-                                public void onFinish() {
-                                    Toast.makeText(getContext(), "印刷完了", Toast.LENGTH_SHORT).show();
-                                }
-                            });
                         })
                         .addOnFailureListener(e -> {
                             //失敗したら