Don't store Activity instance in adapter.

Author: dbrant

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsActivity.java

@@ -227,7 +227,7 @@ public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
     @Override
     public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
         if(contributionsList.getAdapter() == null) {
-            contributionsList.setAdapter(new ContributionsListAdapter(this, cursor, 0));
+            contributionsList.setAdapter(new ContributionsListAdapter(getApplicationContext(), cursor, 0));
         } else {
             ((CursorAdapter)contributionsList.getAdapter()).swapCursor(cursor);
         }

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsListAdapter.java

@@ -1,25 +1,23 @@
 package fr.free.nrw.commons.contributions;
 
-import android.app.Activity;
 import android.content.Context;
 import android.database.Cursor;
 import android.support.v4.widget.CursorAdapter;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
 import fr.free.nrw.commons.R;
 
 class ContributionsListAdapter extends CursorAdapter {
-    private Activity activity;
 
-    public ContributionsListAdapter(Activity activity, Cursor c, int flags) {
-        super(activity, c, flags);
-        this.activity = activity;
+    public ContributionsListAdapter(Context context, Cursor c, int flags) {
+        super(context, c, flags);
     }
 
     @Override
     public View newView(Context context, Cursor cursor, ViewGroup viewGroup) {
-        View parent = activity.getLayoutInflater().inflate(R.layout.layout_contribution, viewGroup, false);
+        View parent = LayoutInflater.from(context).inflate(R.layout.layout_contribution, viewGroup, false);
         parent.setTag(new ContributionViewHolder(parent));
         return parent;
     }