startActivity（intent）之后活动未开始

Question

I am working on the driver application of a cab/taxi booking system. Application has foreground service. Service starts to work with this code in MainActivity:

Intent myService = new Intent(getApplicationContext(), OnLineForegroundService.class);
startForegroundService(myService);

This service starts NewOrderActivity by trigger using the following code:

Intent intent = new Intent(OnLineForegroundService.this, NewOrderActivity.class);
intent.putExtra("newOrder", newOrder);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                      
intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(intent);

After that in NewOrderActivity application starts TripActivity (by user tap):

//some finish service code
...

Intent intent = new Intent(NewOrderActivity.this, TripActivity.class);
intent.putExtra("order", newOrder);
startActivity(intent);
finish();

and the last step is the end of the trip:

//TripActivity

Intent i = new Intent(TripActivity.this, MainActivity.class);
i.putExtra("showOnLineDialog", true);
startActivity(i);
finishAffinity();

These actions are performed cyclically. Sometimes (very rarely) NewOrderActivity doesn't start after startActivity(intent) . Even code in onCreate(Bundle savedInstanceState) or onResume() in NewOrderActivity does not perform. Just nothing happens in the case when some activity is in the foreground. When the application is in the background (except foreground service) - application goes to the foreground and shows last opened activity but not NewOrderActivity. What could be the problem? I suppose that problem may be in Activity lifecycle and flags ( FLAG_ACTIVITY_NEW_TASK and FLAG_ACTIVITY_NO_HISTORY ) but not sure about it.

Manifest:

<application
    android:name=".TaxiApplication"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name=".ui.activities.SplashActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".ui.activities.MainActivity"
        android:screenOrientation="portrait" />
    <activity
        android:name=".ui.activities.NewOrderActivity"
        android:screenOrientation="portrait" />
    <activity
        android:name=".ui.activities.TripActivity"
        android:screenOrientation="portrait" />
    <service android:name=".services.OnLineForegroundService" />
</application>

Answer 1

I don't think starting an activity from a service with the service's context is a good idea, try using application context. Change this:

Intent intent = new Intent(OnLineForegroundService.this, NewOrderActivity.class);

to this:

Intent intent = new Intent(getApplicationContext(), NewOrderActivity.class);