Kill media tasks

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

@@ -357,7 +357,7 @@ public class AdapterMedia extends RecyclerView.Adapter<AdapterMedia.ViewHolder>
                         tvCaption.setVisibility(View.VISIBLE);
                         ivImage.setImageResource(R.drawable.twotone_warning_24);
                     }
-                }.execute(context, owner, args, "media:load");
+                }.setKill(true).execute(context, owner, args, "media:load");
             } else
                 ivImage.setImageResource(attachment.progress == null
                         ? R.drawable.twotone_image_24 : R.drawable.twotone_hourglass_top_24);

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

@@ -54,6 +54,7 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
     private boolean log = true;
     private boolean count = true;
     private boolean keepawake = false;
+    private boolean kill = false;
 
     private String id;
     private String name;
@@ -104,6 +105,12 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
         return this;
     }
 
+    @NonNull
+    public SimpleTask<T> setKill(boolean kill) {
+        this.kill = kill;
+        return this;
+    }
+
     @NonNull
     public SimpleTask<T> setExecutor(ExecutorService executor) {
         this.localExecutor = executor;
@@ -447,6 +454,13 @@ public abstract class SimpleTask<T> implements LifecycleObserver {
     }
 
     protected void onDestroyed(Bundle args) {
+        if (this.kill && future != null)
+            try {
+                Log.i("Killing task=" + name);
+                future.cancel(true);
+            } catch (Throwable ex) {
+                Log.w(ex);
+            }
     }
 
     @Override