Seems that System.gc() call is not necessary

Author: Marko Brčić

MPChartLib/src/com/github/mikephil/charting/renderer/LineChartRenderer.java

@@ -736,6 +736,5 @@ public void releaseBitmap() {
             mDrawBitmap.clear();
             mDrawBitmap = null;
         }
-        System.gc();
     }
 }

MPChartLib/src/com/github/mikephil/charting/renderer/PieChartRenderer.java

@@ -928,6 +928,5 @@ public void releaseBitmap() {
             mDrawBitmap.clear();
             mDrawBitmap = null;
         }
-        System.gc();
     }
 }