在引导时启动 Android 服务

Question

I'm building a simple service app which runs on boot time. The problem is I want this application is only based on service, there will be no activity. I have BrodcastReceiever class and Service class but I couldn't figure how this service will work on device. I edit the run configuration as nothing. When i add activity it works But as i said this must be just a service application. Why it is not working?

manifest.xml

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
<application
    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/Theme.TestService">

    <service
        android:name=".MyService"
        android:enabled="true"
        android:exported="true">

    </service>

    <receiver android:name=".BootDeviceReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED"/>
        </intent-filter>
    </receiver>


</application>

BroadcastReceiver.java

public class BootDeviceReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    Log.d("testLog","broadCast started");

    if(Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())){
      Intent intentService = new Intent(context,MyService.class);
        intentService.setAction(Intent.ACTION_MAIN);
        intentService.addCategory(Intent.CATEGORY_LAUNCHER);

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            context.startForegroundService(intentService);
        }else{
            context.startService(intentService);
        }
    }
}
}

The log doesn't show up in onReceive function.

Thanks for any helps.

Answer 1

This is not possible. When you install your app on a device, your components are all in the "stopped state". They will not be triggered by Android while in the "stopped state". In order to get your components out of this state, the user must, manually, start your app at least once. The only way for the user to start your app is to launch an Activity . And the only way for the user to launch an Activity is for you to have an Activity in your app, and a matching <activity> declaration in your manifest, with an <intent-filter> containing ACTION=MAIN and CATEGORY=LAUNCHER.