varunon9

Full Source Code: https://github.com/varunon9/DynamicWallpaper/tree/always_running_service

Steps-

1. Create a Foreground Service (MyService.java)
2. Create a Manifest registered Broadcast Receiver (MyReceiver.java) which will start your Foreground Service
3. In onDestroy lifecycle of MyService, send a broadcast intent to MyReceiver
4. Launch the MyService on app start from MainActivity (see step 8)
5. With above 4 steps, MyService will always get re-started when killed as long as onDestroy of Service gets called
6. onDestroy method of Service is not always guaranteed to be called and hence it might not get started again

pkozlovskiy

CREATE TABLE document(
    _id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
);

CREATE TABLE tag(
    _id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL
);