Back button to dismiss the more suggestions

Bug: 5275063
Change-Id: If31e9a25d827f44c8d4ff455a780ec2a6d2d9bef

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -35,7 +35,6 @@ import android.preference.PreferenceActivity;
 import android.preference.PreferenceManager;
 import android.text.InputType;
 import android.text.TextUtils;
-import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.PrintWriterPrinter;
 import android.util.Printer;
@@ -1011,8 +1010,12 @@ public class LatinIME extends InputMethodServiceCompatWrapper implements Keyboar
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         switch (keyCode) {
         case KeyEvent.KEYCODE_BACK:
-            if (event.getRepeatCount() == 0 && mKeyboardSwitcher.getKeyboardView() != null) {
+            if (event.getRepeatCount() == 0) {
-                if (mKeyboardSwitcher.getKeyboardView().handleBack()) {
+                if (mSuggestionsView != null && mSuggestionsView.handleBack()) {
+                    return true;
+                }
+                final LatinKeyboardView keyboardView = mKeyboardSwitcher.getKeyboardView();
+                if (keyboardView != null && keyboardView.handleBack()) {
                     return true;
                 }
             }

java/src/com/android/inputmethod/latin/SuggestionsView.java

@@ -728,6 +728,10 @@ public class SuggestionsView extends RelativeLayout implements OnClickListener,
         return false;
     }
 
+    public boolean handleBack() {
+        return dismissMoreSuggestions();
+    }
+
     @Override
     public boolean onLongClick(View view) {
         final SuggestionsViewParams params = mParams;