Bluetoothの切断接続に応じて、HomeFrgmentの表示を変化させる機能を実装

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

@@ -7,6 +7,7 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
+import android.widget.ImageView;
 import android.widget.TextView;
 
 import androidx.core.content.res.ResourcesCompat;
@@ -132,11 +133,58 @@ public class HomeFragment extends Fragment implements OnEventListener{
         return true;
     }
 
+    private boolean updateBluetoothSituation(Boolean Bluetoothconnect){
+        FrameLayout frameLayout;
+        TextView textView;
+        ImageView imageView;
+        try {
+            frameLayout=requireView().findViewById(R.id.situation_bg2);
+            textView=requireView().findViewById(R.id.Bluetoothsituation);
+            imageView=requireView().findViewById(R.id.Bluetoothsituationimage);
+        }catch (NullPointerException e) {
+            Log.d("HomeFragment", "updateUiState: view is null");
+            return false;
+        } catch (IllegalStateException e) {
+            Log.d("HomeFragment", "updateUiState: view is not attached");
+            getParentFragmentManager().beginTransaction().replace(R.id.fragmentContainerView, HomeFragment.newInstance("test", "test")).commit();
+            updateBluetoothSituation(Bluetoothconnect);
+            return false;
+        }
+        String connect="接続中";
+        String disconnect="切断中";
+        if (Bluetoothconnect) {
+            //接続状態にする
+            frameLayout.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.frame_style_orange, null));
+            textView.setText(connect);
+            imageView.setVisibility(View.GONE);
+        } else {
+            //降車状態にする
+            frameLayout.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.frame_style, null));
+            textView.setText(disconnect);
+            imageView.setVisibility(View.VISIBLE);
+        }
+
+        return true;
+    }
+
+
     @Override
-    public boolean onEvent(boolean isInCar) {
+    public boolean onEvent(boolean isInCar) {//乗車状態と降車状態の変更を受け取ってupdateUiState()に渡す
         Log.d("HomeFragment", "onEvent: called");
 
         return updateUiState(isInCar);
     }
+
+    @Override
+    public boolean onEvent2(boolean BluetoothConnect) {
+        return false;
+    }
+
+
+    @Override
+    public boolean onEvent2(Boolean Bluetoothconnect) {//Bluetoothの接続切断を受け取ってupdateBluetoothSituation()に渡す
+        updateBluetoothSituation(Bluetoothconnect);
+        return false;
+    }
 }
 

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

@@ -371,17 +371,21 @@ public class MainActivity extends AppCompatActivity {
 
             if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
                 //Do something if connected
+                //Bluetoothデバイスが接続されたときの処理
+                Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragmentContainerView);
+                Boolean Bluetoothconnect=true;
+                ((HomeFragment) fragment).onEvent2(Bluetoothconnect);//HomeFragmentの表示を接続にする
                 Log.d("BT", "Device connected");
 
-
-
                 Log.d("BT_Judge", "Registered: " + registeredId);
 
                 if (deviceHardwareAddress.equals(registeredId)) {
+                    //登録済みのデバイスだったときの処理
                     Log.d("BT_Judge", "登録済み");
                     e.putBoolean("connection_status",true);
 
                 } else{
+                    //登録していないデバイスだったときの処理
                     Log.d("BT_Judge", "未登録");
                     e.putBoolean("connection_status",false);
                 }
@@ -390,6 +394,10 @@ public class MainActivity extends AppCompatActivity {
             } else if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)&&!isInCar) {//bluetoothが切断されたときに乗車状態のとき
 
                 //Do something if disconnected
+                //デバイスが切断されたときの処理
+                Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragmentContainerView);
+                Boolean Bluetoothconnect=false;
+                ((HomeFragment) fragment).onEvent2(Bluetoothconnect);//HomeFragmentの表示を切断にする
                 if (deviceHardwareAddress.equals(registeredId)) {
                     // 5分待機する
                     Handler handler = new Handler();

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

@@ -3,4 +3,8 @@ package com.example.childguard;
 public interface OnEventListener {
 
     boolean onEvent(boolean state);
+
+    boolean onEvent2(boolean BluetoothConnect);
+
+    boolean onEvent2(Boolean Bluetoothconnect);
 }

app/src/main/res/layout/fragment_home.xml

@@ -49,6 +49,7 @@
         </FrameLayout>
 
         <FrameLayout
+            android:id="@+id/situation_bg2"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginLeft="20dp"
@@ -57,6 +58,7 @@
             android:background="@drawable/frame_style">
 
             <TextView
+                android:id="@+id/Bluetoothsituation"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="5dp"
@@ -73,6 +75,7 @@
                 android:textAlignment="center" />
 
             <ImageView
+                android:id="@+id/Bluetoothsituationimage"
                 android:layout_width="match_parent"
                 android:layout_height="100dp"
                 android:layout_marginTop="50dp"