halfhp#52 - Added NPE check to Plot.renderOnCanvas (halfhp#59)

halfhp · web-flow · commit a16a1df75adf · 2017-08-05T09:58:01.000-05:00
diff --git a/androidplot-core/src/main/java/com/androidplot/Plot.java b/androidplot-core/src/main/java/com/androidplot/Plot.java
@@ -21,6 +21,7 @@
 import android.graphics.*;
 import android.os.Build;
 import android.os.Looper;
+import android.support.annotation.Nullable;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.View;
@@ -804,7 +805,10 @@ protected void onDraw(Canvas canvas) {
      * "heavy lifting".
      * @param canvas
      */
-    protected synchronized void renderOnCanvas(Canvas canvas) {
+    protected synchronized void renderOnCanvas(@Nullable Canvas canvas) {
+        if(canvas == null) {
+            return;
+        }
         try {
             // any series interested in synchronizing with plot should
             // implement PlotListener.onBeforeDraw(...) and do a read lock from within its
