Add utility class to post notifications

app/src/org/commcare/utils/NotificationUtil.java

@@ -0,0 +1,48 @@
+package org.commcare.utils;
+
+import static android.content.Context.NOTIFICATION_SERVICE;
+
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+
+import androidx.core.app.NotificationCompat;
+
+import org.commcare.activities.DispatchActivity;
+import org.commcare.dalvik.R;
+
+/**
+ * Set of methods to post notifications to the user.
+ *
+ * @author avazirna
+ */
+public class NotificationUtil {
+    public static void showNotification(Context context, String notificationChannel, int notificationId,
+                                        String notificationTitle, String notificationText, Intent actionIntent) {
+
+        int pendingIntentFlags = PendingIntent.FLAG_UPDATE_CURRENT;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            pendingIntentFlags = pendingIntentFlags | PendingIntent.FLAG_IMMUTABLE;
+        }
+        PendingIntent contentIntent =
+                PendingIntent.getActivity(context, 0, actionIntent, pendingIntentFlags);
+
+        NotificationCompat.Builder notification =
+                new NotificationCompat.Builder(context, notificationChannel)
+                        .setContentTitle(notificationTitle)
+                        .setContentText(notificationText)
+                        .setContentIntent(contentIntent)
+                        .setSmallIcon(R.drawable.notification)
+                        .setPriority(NotificationCompat.PRIORITY_HIGH)
+                        .setWhen(System.currentTimeMillis());
+        ((NotificationManager) context.getSystemService(NOTIFICATION_SERVICE))
+                .notify(notificationId, notification.build());
+    }
+
+    public static void cancelNotification(Context context, int notificationId) {
+        ((NotificationManager) context.getSystemService(NOTIFICATION_SERVICE))
+                .cancel(notificationId);
+    }
+}