1 files changed, 6 insertions, 4 deletions
diff --git a/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java b/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java
index 755a99a2c..c76a9aca4 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java
@@ -22,6 +22,8 @@ import android.view.View;
 import com.android.inputmethod.keyboard.MainKeyboardView;
 import com.android.inputmethod.keyboard.PointerTracker;
 
+import javax.annotation.Nonnull;
+
 /**
  * Abstract base class for previews that are drawn on DrawingPreviewPlacerView, e.g.,
  * GestureFloatingTextDrawingPreview, GestureTrailsDrawingPreview, and
@@ -32,7 +34,7 @@ public abstract class AbstractDrawingPreview {
     private boolean mPreviewEnabled;
     private boolean mHasValidGeometry;
 
-    public void setDrawingView(final DrawingPreviewPlacerView drawingView) {
+    public void setDrawingView(@Nonnull final DrawingPreviewPlacerView drawingView) {
         mDrawingView = drawingView;
         drawingView.addPreview(this);
     }
@@ -61,7 +63,7 @@ public abstract class AbstractDrawingPreview {
      * @param width the width of {@link MainKeyboardView}.
      * @param height the height of {@link MainKeyboardView}.
      */
-    public void setKeyboardViewGeometry(final int[] originCoords, final int width,
+    public void setKeyboardViewGeometry(@Nonnull final int[] originCoords, final int width,
             final int height) {
         mHasValidGeometry = (width > 0 && height > 0);
     }
@@ -72,11 +74,11 @@ public abstract class AbstractDrawingPreview {
      * Draws the preview
      * @param canvas The canvas where the preview is drawn.
      */
-    public abstract void drawPreview(final Canvas canvas);
+    public abstract void drawPreview(@Nonnull final Canvas canvas);
 
     /**
      * Set the position of the preview.
      * @param tracker The new location of the preview is based on the points in PointerTracker.
      */
-    public abstract void setPreviewPosition(final PointerTracker tracker);
+    public abstract void setPreviewPosition(@Nonnull final PointerTracker tracker);
 }