针对Android8.0启动服务处理，getRunningService无效处理。

app/src/main/AndroidManifest.xml

@@ -4,7 +4,11 @@
 
     <uses-permission android:name="app.custom.permission" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
 
+    <queries>
+        <package android:name="com.youbay.classcard" />
+    </queries>
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

app/src/main/java/com/youbay/daemon/BootReceiver.java

@@ -6,6 +6,7 @@ import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.os.Build;
 
 /**
  * @author Administrator
@@ -34,13 +35,23 @@ public class BootReceiver extends BroadcastReceiver {
     }
 
     private void startIntent(Context context) {
-        if (isServiceRunning(context)) {
+
+        /*if (isServiceRunning(context)) {
             System.out.println("this daemon service is running ..");
         } else {
             final Intent daemonIntent = new Intent();
             daemonIntent.setAction(DAEMON_SERVICE_ACTION);
             daemonIntent.setComponent(new ComponentName(APP_PACKAGE_NAME, DAEMON_SERVICE_NAME));
             context.startService(daemonIntent);
+        }*/
+
+        final Intent daemonIntent = new Intent();
+        daemonIntent.setAction(DAEMON_SERVICE_ACTION);
+        daemonIntent.setComponent(new ComponentName(APP_PACKAGE_NAME, DAEMON_SERVICE_NAME));
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            context.startForegroundService(daemonIntent);
+        } else {
+            context.startService(daemonIntent);
         }
     }
 

app/src/main/java/com/youbay/daemon/DaemonService.java

 package com.youbay.daemon;
 
-import android.app.ActivityManager;
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
-import android.os.Bundle;
+import android.os.Build;
 import android.os.IBinder;
-import android.os.Message;
 import android.util.Log;
 
-import java.util.List;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
@@ -26,28 +25,40 @@ public class DaemonService extends Service {
     private static final String APP_SERVICE_NAME = "com.youbay.classcard.service.DaemonService";
     private static final String APP_SERVICE_ACTION = "com.youbay.classcard.service.DaemonService";
 
-    private boolean isRunning = false;
-    private final ExecutorService executorService = Executors.newSingleThreadExecutor(Executors.defaultThreadFactory());
     private final ScheduledExecutorService scheduledExecutor = Executors.newSingleThreadScheduledExecutor();
 
+    private String mTopActivityBefore = "";
+    private static final CharSequence CHANNEL_NAME = "demon-app";
+    private static final String CHANNEL_ID = "Daemon-1";
+
     @Override
     public void onCreate() {
         super.onCreate();
         Log.i(TAG, "DaemonService is onCreate");
-        //runProcess();
+
         scheduleCheckDaemonServiceAlive();
     }
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
-        Log.i(TAG, "on start command: ");
+        Log.i(TAG, "DaemonService is onStartCommand: ");
+        NotificationChannel channel = null;
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
+            channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
+            NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+            if (manager != null) {
+                manager.createNotificationChannel(channel);
+            }
+            channel.setSound(null, null);
+            Notification notification = new Notification.Builder(getApplicationContext(), CHANNEL_ID).build();
+            startForeground(11, notification);
+        }
         return START_STICKY;
     }
 
     @Override
     public void onDestroy() {
         Log.i(TAG, "ODestroy");
-        isRunning = false;
     }
 
     public DaemonService() {
@@ -63,43 +74,22 @@ public class DaemonService extends Service {
             @Override
             public void run() {
                 try {
-                    if (!isServiceRunning(DaemonService.this, APP_SERVICE_NAME)) {
+                    if (!isTopActivity(PACKAGE_NAME)) {
                         Log.d(TAG, "Class band daemon service is not alive, restart it by Daemon app");
                         final Intent daemonIntent = new Intent();
                         daemonIntent.setAction(APP_SERVICE_ACTION);
                         daemonIntent.setComponent(new ComponentName(PACKAGE_NAME, APP_SERVICE_NAME));
-                        startService(daemonIntent);
+                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                            startForegroundService(daemonIntent);
+                        } else {
+                            startService(daemonIntent);
+                        }
                     }
                 } catch (Exception e) {
                     Log.e(TAG, e.toString());
                 }
             }
-        }, 1000, 1000, TimeUnit.MILLISECONDS);
-    }
-
-    private void runProcess() {
-        isRunning = true;
-        executorService.execute(new Runnable() {
-            @Override
-            public void run() {
-                while (isRunning) {
-                    try {
-                        Thread.sleep(1000);
-                    } catch (InterruptedException e) {
-                        e.printStackTrace();
-                    }
-
-                    try {
-                        final Intent daemonIntent = new Intent();
-                        daemonIntent.setAction(APP_SERVICE_ACTION);
-                        daemonIntent.setComponent(new ComponentName(PACKAGE_NAME, APP_SERVICE_NAME));
-                        startService(daemonIntent);
-                    } catch (Exception e) {
-                        Log.e(TAG, e.toString());
-                    }
-                }
-            }
-        });
+        }, 1000, 2000, TimeUnit.MILLISECONDS);
     }
 
     public boolean isTopActivity(String packageName) {
@@ -110,32 +100,24 @@ public class DaemonService extends Service {
         if (start < 0 || end < 0 || end <= start) {
             return false;
         }
-
+        //Log.d(TAG, "s: " + start + " end:" + end + " result:" + result);
         String top = result.substring(start, end);
-        if (top.contentEquals(packageName)) {
+        if (mTopActivityBefore != null && !mTopActivityBefore.equals(result)) {
+            Log.d(TAG, "top Activity Before = " + mTopActivityBefore);
+            Log.d(TAG, "top Activity After  = " + result);
+            mTopActivityBefore = result;
+        }
+        // 不是com.youbay.classcard 包名或者 跳转到设置“允许在其他应用上”。
+        if (topSituation(result) || top.contentEquals(packageName)) {
             return true;
         }
         return false;
     }
 
-    /**
-     * 判断Service是否正在运行
-     *
-     * @param context     上下文
-     * @param serviceName Service 类全名
-     * @return true 表示正在运行，false 表示没有运行
-     */
-    public static boolean isServiceRunning(Context context, String serviceName) {
-        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
-        List<ActivityManager.RunningServiceInfo> serviceInfoList = manager.getRunningServices(200);
-        if (serviceInfoList.size() <= 0) {
-            return false;
-        }
-        for (ActivityManager.RunningServiceInfo info : serviceInfoList) {
-            //Log.d(TAG,info.service.getClassName());
-            if (info.service.getClassName().equals(serviceName)) {
-                return true;
-            }
+    //弹出授权界面默认是在顶部情况
+    private boolean topSituation(String activityName) {
+        if (activityName.contains("AppDrawOverlaySettingsActivity") || activityName.contains("GrantPermissionsActivity")) {
+            return true;
         }
         return false;
     }

app/src/main/java/com/youbay/daemon/MainActivity.java

 package com.youbay.daemon;
 
-import androidx.appcompat.app.AppCompatActivity;
-
-import android.content.ComponentName;
 import android.content.Intent;
-import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 import android.util.Log;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 public class MainActivity extends AppCompatActivity {
 
     private static final String TAG = "MainActivity";
@@ -17,10 +16,14 @@ public class MainActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         //setContentView(R.layout.activity_main);
-        Toast.makeText(this,"守护服务启动成功", Toast.LENGTH_SHORT).show();
-        Log.d(TAG,"守护服务启动成功");
-        startService(new Intent(this,DaemonService.class));
+        Toast.makeText(this, "守护服务启动成功", Toast.LENGTH_SHORT).show();
+        Log.d(TAG, "守护服务启动成功");
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            startForegroundService(new Intent(this, DaemonService.class));
+        } else {
+            startService(new Intent(this, DaemonService.class));
+        }
         /*PackageManager packageManager = getPackageManager();
         ComponentName componentName = new ComponentName(this, MainActivity.class);
         int res = packageManager.getComponentEnabledSetting(componentName);