Override View.drawableStateChanged to detect state_pressed

Unlike on JB, View.setPressed(boolean) is never called when the view
is pressed on ICS. To detect a pressed state of the view, we need to
override View.drawableStateChanged() and check the drawable state
contains state_pressed.

Bug: 8159728
Change-Id: I481051364d6f3d1370742723c3ce19d898ea5463

java/src/com/android/inputmethod/latin/setup/SetupStartIndicatorView.java

@@ -51,11 +51,32 @@ public final class SetupStartIndicatorView extends LinearLayout {
             mIndicatorView = indicatorView;
         }
 
+        // TODO: Once we stop supporting ICS, uncomment {@link #setPressed(boolean)} method and
+        // remove this method.
         @Override
-        public void setPressed(final boolean pressed) {
+        protected void drawableStateChanged() {
-            super.setPressed(pressed);
+            super.drawableStateChanged();
+            for (final int state : getDrawableState()) {
+                if (state == android.R.attr.state_pressed) {
+                    updateIndicatorView(true /* pressed */);
+                    return;
+                }
+            }
+            updateIndicatorView(false /* pressed */);
+        }
+
+        // TODO: Once we stop supporting ICS, uncomment this method and remove
+        // {@link #drawableStateChanged()} method.
+//        @Override
+//        public void setPressed(final boolean pressed) {
+//            super.setPressed(pressed);
+//            updateIndicatorView(pressed);
+//        }
+
+        private void updateIndicatorView(final boolean pressed) {
             if (mIndicatorView != null) {
                 mIndicatorView.setPressed(pressed);
+                mIndicatorView.invalidate();
             }
         }
     }
@@ -72,12 +93,6 @@ public final class SetupStartIndicatorView extends LinearLayout {
             mIndicatorPaint.setStyle(Paint.Style.FILL);
         }
 
-        @Override
-        public void setPressed(final boolean pressed) {
-            super.setPressed(pressed);
-            invalidate();
-        }
-
         @Override
         protected void onDraw(final Canvas canvas) {
             super.onDraw(canvas);