implement asynchronous login to prevent several common crashes

app/src/main/java/com/dkanada/gramophone/service/LoginService.java

@@ -0,0 +1,73 @@
+package com.dkanada.gramophone.service;
+
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.IBinder;
+import android.widget.Toast;
+
+import androidx.annotation.Nullable;
+
+import com.dkanada.gramophone.App;
+import com.dkanada.gramophone.BuildConfig;
+import com.dkanada.gramophone.R;
+import com.dkanada.gramophone.model.User;
+import com.dkanada.gramophone.util.PreferenceUtil;
+
+import org.jellyfin.apiclient.interaction.EmptyResponse;
+import org.jellyfin.apiclient.interaction.Response;
+import org.jellyfin.apiclient.model.session.ClientCapabilities;
+import org.jellyfin.apiclient.model.system.SystemInfo;
+
+public class LoginService extends Service {
+    public static final String PACKAGE_NAME = BuildConfig.APPLICATION_ID;
+
+    public static final String STATE_POLLING = PACKAGE_NAME + ".unknown";
+    public static final String STATE_ONLINE = PACKAGE_NAME + ".online";
+    public static final String STATE_OFFLINE = PACKAGE_NAME + ".offline";
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        sendBroadcast(new Intent(STATE_POLLING));
+        authenticate();
+
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    private void authenticate() {
+        User user = App.getDatabase().userDao().getUser(PreferenceUtil.getInstance(this).getUser());
+        Context context = this;
+
+        if (user == null) {
+            Toast.makeText(this, context.getResources().getString(R.string.error_unexpected), Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        App.getApiClient().ChangeServerLocation(user.server);
+        App.getApiClient().SetAuthenticationInfo(user.token, user.id);
+        App.getApiClient().GetSystemInfoAsync(new Response<SystemInfo>() {
+            @Override
+            public void onResponse(SystemInfo result) {
+                ClientCapabilities clientCapabilities = new ClientCapabilities();
+                clientCapabilities.setSupportsMediaControl(true);
+                clientCapabilities.setSupportsPersistentIdentifier(true);
+
+                App.getApiClient().ensureWebSocket();
+                App.getApiClient().ReportCapabilities(clientCapabilities, new EmptyResponse());
+
+                sendBroadcast(new Intent(STATE_ONLINE));
+            }
+
+            @Override
+            public void onError(Exception exception) {
+                sendBroadcast(new Intent(STATE_OFFLINE));
+            }
+        });
+    }
+}

app/src/main/java/com/dkanada/gramophone/service/receivers/NetworkReceiver.java

@@ -0,0 +1,24 @@
+package com.dkanada.gramophone.service.receivers;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+
+import com.dkanada.gramophone.service.LoginService;
+
+public class NetworkReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo netInfo = cm.getActiveNetworkInfo();
+
+        // network info will be null in airplane mode
+        if (netInfo != null && netInfo.isConnected()) {
+            context.sendBroadcast(new Intent(LoginService.STATE_ONLINE));
+        } else {
+            context.sendBroadcast(new Intent(LoginService.STATE_OFFLINE));
+        }
+    }
+}