アプリに登録されているBluetoothデバイスの切断時に乗車状態のとき５分間のタイマを起動し、５分後にもBluetoothが切断されたままで乗車状態であるときに通知が送られるようにしました。また、同様の記述をMainActivityにも行い、バックグラウンド時だけでなくアプリ起動時も使えるようにしました。

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

@@ -1,6 +1,5 @@
 package com.example.childguard;
 
-import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.util.Log;

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

@@ -4,9 +4,7 @@ import android.annotation.SuppressLint;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
-import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
-import android.bluetooth.BluetoothManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -17,11 +15,10 @@ import android.graphics.Color;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.Handler;
 import android.os.Vibrator;
-import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 import android.util.Log;
-import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.Toast;
 
@@ -44,8 +41,6 @@ import java.util.Map;
 public class MainActivity extends AppCompatActivity {
 
     FirebaseFirestore db;
-    BluetoothManager bluetoothManager;
-    BluetoothAdapter bluetoothAdapter;
 
 
     DocumentReference mDocRef;
@@ -114,6 +109,7 @@ public class MainActivity extends AppCompatActivity {
                         .commit();
             }
             firebaselink();
+            Bluetooth_status();
             return true;
         });
 
@@ -168,7 +164,7 @@ public class MainActivity extends AppCompatActivity {
                 E.apply();//確定処理
                 Log.d("nt", "レスポンスを検知しました1");
                 //FireBaseで更新された情報の判定
-                if (documentSnapshot.getBoolean("isReported") == false) {//isReportedがfalseのとき=サイト上で保護者ボタンが押されたとき
+                if (!documentSnapshot.getBoolean("isReported")) {//isReportedがfalseのとき=サイト上で保護者ボタンが押されたとき
                     if (fragment instanceof HomeFragment) {//fragmentがHomeFragmentのインスタンスかの判定
 //                        changessituation();//  changessituation()メソッドを処理→アプリ側の乗降状態を変化
                         ((HomeFragment) fragment).onEvent(!isInCar);
@@ -193,54 +189,6 @@ public class MainActivity extends AppCompatActivity {
     }
 
 
-    //Bluetoothの検知機能
-
-    private final BroadcastReceiver receiver = new BroadcastReceiver() {
-
-
-                //PreferenceManager.getDefaultSharedPreferences("myPreferences",Context.MODE_PRIVATE);
-
-        @Override
-        public void onReceive(Context context, Intent intent) {
-            SharedPreferences pref= PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
-            SharedPreferences.Editor e=pref.edit();
-            String action = intent.getAction(); // may need to chain this to a recognizing function
-            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
-
-//            HomeFragment homeFragment=new HomeFragment();
-
-            if (ActivityCompat.checkSelfPermission(context, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
-                Log.d("BT", "No permission to connect bluetooth devices");
-                return;
-            }
-            String deviceHardwareAddress = device.getAddress(); // MAC address
-
-            if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
-                //Do something if connected
-                Log.d("BT", "Device connected");
-
-                String registeredId = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("bluetooth_device_id", "none");
-
-                Log.d("BT_Judge", "Registered: " + registeredId);
-
-                if (deviceHardwareAddress.equals(registeredId)) {
-                    Log.d("BT_Judge", "登録済み");
-                    e.putBoolean("connection_status",true);
-
-                } else{
-                    Log.d("BT_Judge", "未登録");
-                    e.putBoolean("connection_status",false);
-                }
-                e.apply();
-
-            } else if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
-                //Do something if disconnected
-                Log.d("BT", "Device disconnected");
-                e.putBoolean("connection_status",false);
-                e.apply();
-            }
-        }
-    };
 
 
     public void firebaselink() {//Firebaseのドキュメントの取得
@@ -325,6 +273,7 @@ public class MainActivity extends AppCompatActivity {
         notificationManager.notify(R.string.app_name, builder.build());//通知の表示
     }
 
+
     @Override
     public void onStop() {//アプリをバックグラウンドにした時のメソッド
         super.onStop();
@@ -332,5 +281,131 @@ public class MainActivity extends AppCompatActivity {
         startService(intent);//TestServiceを起動
     }
 
+    public void NotificationBluetooth(Context context) {//実際に通知を行うメソッド
+        final String CHANNEL_ID = "my_channel_id";
+        // 通知がクリックされたときに送信されるIntent
+        Intent intent = new Intent(context, MainActivity.class);
+        intent.setAction("OPEN_ACTIVITY");
+        // PendingIntentの作成
+        int requestCode = 100;
+        int flags = 0;
+        PendingIntent pendingIntent = PendingIntent.getActivity(context, requestCode, intent, flags | PendingIntent.FLAG_IMMUTABLE);
+
+        ((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).vibrate(2000);//バイブレーション
+
+        @SuppressLint("NotificationTrampoline") NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "CHANNEL_ID")
+                .setSmallIcon(android.R.drawable.ic_menu_info_details)
+                .setContentTitle("子供の置き去りをしていませんか？")//通知のタイトル
+                .setContentText("Bluetoothと車の切断から5分が経過しました")//通知の本文
+                .setContentIntent(pendingIntent)//通知をタップするとActivityへ移動する
+                .setAutoCancel(true)//通知をタップすると削除する
+                .setPriority(NotificationCompat.PRIORITY_HIGH) // プライオリティを高く設定
+                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC); // ロック画面に表示する
+
+        // NotificationChannelの作成（Android 8.0以降）
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
+            if (notificationManager != null) {
+                NotificationChannel channel = new NotificationChannel(
+                        CHANNEL_ID,
+                        "Channel Name",
+                        NotificationManager.IMPORTANCE_HIGH
+                );
+
+                channel.setDescription("Channel Description");
+                channel.enableLights(true);
+                channel.setLightColor(Color.RED);
+                channel.enableVibration(true);
+                notificationManager.createNotificationChannel(channel);
+            }
+        }
+
+
+        NotificationManager notificationManager = (NotificationManager)context.getSystemService(context.NOTIFICATION_SERVICE);
+        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
+            return;
+        }
+        notificationManager.notify(R.string.app_name, builder.build());//通知の表示
+    }
+
+
+
+
+
+    public void Bluetooth_status() {
+        IntentFilter intentFilter = new IntentFilter();
+        intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
+        intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
+
+        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+            Log.d("BT", "No permission to connect bluetooth devices");
+            return;
+        } else {
+            Log.d("BT", "Permission to connect bluetooth devices granted");
+        }
+        registerReceiver(receiver, intentFilter);
+    }
+
+
+    private final BroadcastReceiver receiver = new BroadcastReceiver() {
+
+
+        //PreferenceManager.getDefaultSharedPreferences("myPreferences",Context.MODE_PRIVATE);
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            SharedPreferences pref=getSharedPreferences("Bluetooth_situation",MODE_PRIVATE);
+            SharedPreferences.Editor e=pref.edit();
+            String action = intent.getAction(); // may need to chain this to a recognizing function
+            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
+            Boolean isInCar = pref.getBoolean("isInCarPref", false);
+
+
+            if (ActivityCompat.checkSelfPermission(context, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+                Log.d("BT", "No permission to connect bluetooth devices");
+                return;
+            }
+            String deviceHardwareAddress = device.getAddress(); // MAC address
+
+            String registeredId = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("bluetooth_device_id", "none");
+
+            if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
+                //Do something if connected
+                Log.d("BT", "Device connected");
+
+
+
+                Log.d("BT_Judge", "Registered: " + registeredId);
+
+                if (deviceHardwareAddress.equals(registeredId)) {
+                    Log.d("BT_Judge", "登録済み");
+                    e.putBoolean("connection_status",true);
+
+                } else{
+                    Log.d("BT_Judge", "未登録");
+                    e.putBoolean("connection_status",false);
+                }
+                e.apply();
+
+            } 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
+                if (deviceHardwareAddress.equals(registeredId)) {
+                    // 5分待機する
+                    Handler handler = new Handler();
+                    handler.postDelayed(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)&&!isInCar) {//その後bluetoothを再接続したり降車状態になったりしていない＝置き去りが発生した可能性大
+                                NotificationBluetooth(getApplicationContext());//通知を行うメソッド
+                            }}
+
+                    }, 5*60*1000); // 5分をミリ秒に変換
+                }
+            }else {
+                Log.d("BT", "Device disconnected");
+            }
+        }
+};
 }
 

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

@@ -1,7 +1,6 @@
 package com.example.childguard;
 
 import android.annotation.SuppressLint;
-import android.app.Activity;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
@@ -10,35 +9,24 @@ import android.bluetooth.BluetoothDevice;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
-import android.content.SharedPreferences;
 import android.content.IntentFilter;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.graphics.Color;
 import android.os.Build;
-import android.os.Bundle;
 import android.os.Handler;
 import android.os.IBinder;
-import android.os.Looper;
 import android.os.Vibrator;
 import android.preference.PreferenceManager;
 import android.util.Log;
-import android.widget.Toast;
 
 import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
 import androidx.core.app.NotificationCompat;
-import androidx.recyclerview.widget.DividerItemDecoration;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.widget.RecyclerView;
 
 import com.google.firebase.firestore.DocumentReference;
 import com.google.firebase.firestore.FirebaseFirestore;
 
-import java.text.DateFormat;
-import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -48,8 +36,6 @@ public class TestService extends Service {
 
     public static final String TAG = "InspirationQuote";
 
-;
-
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
@@ -95,9 +81,7 @@ public class TestService extends Service {
                         NotificationSetting();//通知に関する設定のメソッド
                         Notification(getApplicationContext());//通知を行うメソッド
                     }
-                } else if(!isInCar){//isReportedがfalse=サイト上で降車状態のとき
+                } else {//isReportedがfalse=サイト上で降車状態のとき
-                    ResetReported();//ResetReported();を処理→FireBaseのisReportedをfalseにする
-                }else {
                     ResetReported();//ResetReported();を処理→FireBaseのisReportedをfalseにする
                 }
             }
@@ -248,10 +232,11 @@ public class TestService extends Service {
 
         @Override
         public void onReceive(Context context, Intent intent) {
-            SharedPreferences pref= PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
+            SharedPreferences pref=getSharedPreferences("Bluetooth_situation",MODE_PRIVATE);
             SharedPreferences.Editor e=pref.edit();
             String action = intent.getAction(); // may need to chain this to a recognizing function
             BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
+            Boolean isInCar = pref.getBoolean("isInCarPref", false);
 
 
             if (ActivityCompat.checkSelfPermission(context, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
@@ -280,17 +265,23 @@ public class TestService extends Service {
                 }
                 e.apply();
 
-            } else if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
+            } 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
                 if (deviceHardwareAddress.equals(registeredId)) {
-                    Log.d("BT_Judge", "登録済み切断");
+                    // 5分待機する
-                    e.putBoolean("connection_status",false);
+                    Handler handler = new Handler();
+                    handler.postDelayed(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)&&!isInCar) {//その後bluetoothを再接続したり降車状態になったりしていない＝置き去りが発生した可能性大
+                                NotificationBluetooth(getApplicationContext());//通知を行うメソッド
+                            }}
 
+                    }, 5 *60 *1000); // 5分をミリ秒に変換
                 }
+            }else {
                 Log.d("BT", "Device disconnected");
-                e.apply();
-                NotificationBluetooth(getApplicationContext());
-
             }
         }
     };