Move creation of singleton Picasso to Application onCreate

This allows using cached images for notifications

app/src/main/AndroidManifest.xml

@@ -16,7 +16,8 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme">
+        android:theme="@style/AppTheme"
+        android:name="app.insti.InstiAppApplication">
 
         <meta-data
             android:name="com.google.android.gms.version"

app/src/main/java/app/insti/InstiAppApplication.java

+package app.insti;
+
+import android.app.Application;
+
+import com.squareup.picasso.Picasso;
+
+import java.io.File;
+
+import okhttp3.Cache;
+import okhttp3.OkHttpClient;
+
+public class InstiAppApplication extends Application {
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        try {
+            initPicasso();
+        } catch (IllegalStateException ignored) {}
+    }
+
+    public void initPicasso() {
+        Picasso.Builder builder = new Picasso.Builder(getApplicationContext());
+        OkHttpClient.Builder client = new OkHttpClient.Builder();
+        Cache cache = new Cache(new File(getApplicationContext().getCacheDir(), "http-cache"), 100 * 1024 * 1024);
+        client.cache(cache);
+        builder.downloader(new com.squareup.picasso.OkHttp3Downloader((
+                client.build()
+        )));
+        Picasso built = builder.build();
+        built.setIndicatorsEnabled(false);
+        built.setLoggingEnabled(false);
+        Picasso.setSingletonInstance(built);
+    }
+}

app/src/main/java/app/insti/InstiAppFirebaseMessagingService.java

@@ -13,7 +13,6 @@ import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.media.RingtoneManager;
 import android.net.Uri;
-import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationManagerCompat;

app/src/main/java/app/insti/activity/MainActivity.java

@@ -38,7 +38,6 @@ import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.squareup.picasso.Picasso;
 
-import java.io.File;
 import java.util.List;
 
 import app.insti.Constants;
@@ -47,12 +46,12 @@ import app.insti.SessionManager;
 import app.insti.api.EmptyCallback;
 import app.insti.api.RetrofitInterface;
 import app.insti.api.ServiceGenerator;
-import app.insti.api.request.UserFCMPatchRequest;
 import app.insti.api.model.Body;
 import app.insti.api.model.Event;
 import app.insti.api.model.Notification;
 import app.insti.api.model.Role;
 import app.insti.api.model.User;
+import app.insti.api.request.UserFCMPatchRequest;
 import app.insti.fragment.BackHandledFragment;
 import app.insti.fragment.BodyFragment;
 import app.insti.fragment.CalendarFragment;
@@ -68,8 +67,6 @@ import app.insti.fragment.QuickLinksFragment;
 import app.insti.fragment.SettingsFragment;
 import app.insti.fragment.TrainingBlogFragment;
 import app.insti.fragment.UserFragment;
-import okhttp3.Cache;
-import okhttp3.OkHttpClient;
 import retrofit2.Call;
 import retrofit2.Response;
 
@@ -116,10 +113,6 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        try {
-            initPicasso();
-        } catch (IllegalStateException ignored) {
-        }
 
         ServiceGenerator serviceGenerator = new ServiceGenerator(getApplicationContext());
         this.retrofitInterface = serviceGenerator.getRetrofitInterface();
@@ -608,20 +601,6 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
         return "sessionid=" + session.getSessionID();
     }
 
-    public void initPicasso() {
-        Picasso.Builder builder = new Picasso.Builder(getApplicationContext());
-        OkHttpClient.Builder client = new OkHttpClient.Builder();
-        Cache cache = new Cache(new File(getApplicationContext().getCacheDir(), "http-cache"), 100 * 1024 * 1024);
-        client.cache(cache);
-        builder.downloader(new com.squareup.picasso.OkHttp3Downloader((
-                client.build()
-        )));
-        Picasso built = builder.build();
-        built.setIndicatorsEnabled(false);
-        built.setLoggingEnabled(false);
-        Picasso.setSingletonInstance(built);
-    }
-
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);