Simple loader fixes

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -184,9 +184,9 @@ public class ActivityView extends ActivityBase implements FragmentManager.OnBack
         new SimpleLoader<Long>() {
             @Override
             public Long onLoad(Bundle args) throws Throwable {
-                File file = new File(getCacheDir(), "crash.log");
+                File file = new File(getContext().getCacheDir(), "crash.log");
                 if (file.exists()) {
-                    DB db = DB.getInstance(ActivityView.this);
+                    DB db = DB.getInstance(getContext());
                     EntityFolder drafts = db.folder().getPrimaryDrafts();
                     if (drafts != null) {
                         Address to = new InternetAddress("marcel+email@faircode.eu", "FairCode");
@@ -352,7 +352,7 @@ public class ActivityView extends ActivityBase implements FragmentManager.OnBack
                 @Override
                 public Object onLoad(Bundle args) {
                     long time = args.getLong("time");
-                    DaoAccount dao = DB.getInstance(ActivityView.this).account();
+                    DaoAccount dao = DB.getInstance(getContext()).account();
                     for (EntityAccount account : dao.getAccounts(true)) {
                         account.seen_until = time;
                         dao.updateAccount(account);

app/src/main/java/eu/faircode/email/SimpleLoader.java

@@ -1,5 +1,24 @@
 package eu.faircode.email;
 
+/*
+    This file is part of Safe email.
+
+    Safe email is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    NetGuard is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
 import android.content.Context;
 import android.os.Bundle;
 import android.util.Log;
@@ -10,6 +29,11 @@ import androidx.loader.app.LoaderManager;
 import androidx.loader.content.AsyncTaskLoader;
 import androidx.loader.content.Loader;
 
+//
+// This simple loader is simple to use, but it is also simple to cause bugs that can easily lead to crashes
+// Make sure to not access any member in any outer scope from onLoad
+//
+
 public abstract class SimpleLoader<T> {
     private Context context;
     private LoaderManager manager;
@@ -27,6 +51,7 @@ public abstract class SimpleLoader<T> {
     }
 
     public T onLoad(Bundle args) throws Throwable {
+        // Be careful not to access members in outer scopes
         return null;
     }
 
@@ -36,6 +61,10 @@ public abstract class SimpleLoader<T> {
     public void onException(Bundle args, Throwable ex) {
     }
 
+    protected Context getContext() {
+        return context;
+    }
+
     private static class CommonLoader extends AsyncTaskLoader<Result> {
         Bundle args;
         SimpleLoader loader;