Fix EditBox turning black when soft keyboard hide.

I disable a optimization when users start to type, the resize layout's
doLayout event should be stoped.

But it has bugs. If we could find reliable soft keyboard show/hide
event detection method, we could enable this optimization again.

cocos/platform/android/java/src/org/cocos2dx/lib/Cocos2dxActivity.java

@@ -348,7 +348,6 @@ public abstract class Cocos2dxActivity extends Activity implements Cocos2dxHelpe
         if (hasFocus) {
             Cocos2dxHelper.onResume();
             mGLSurfaceView.onResume();
-            mGLSurfaceView.requestFocus();
         }
     }
 
@@ -357,7 +356,6 @@ public abstract class Cocos2dxActivity extends Activity implements Cocos2dxHelpe
         super.onPause();
         Cocos2dxHelper.onPause();
         mGLSurfaceView.onPause();
-        mGLSurfaceView.setSoftKeyboardShown(false);
     }
     
     @Override

cocos/platform/android/java/src/org/cocos2dx/lib/Cocos2dxEditBox.java

@@ -204,6 +204,7 @@ public class Cocos2dxEditBox extends EditText {
         switch (pKeyCode) {
             case KeyEvent.KEYCODE_BACK:
                 Cocos2dxActivity activity = (Cocos2dxActivity)this.getContext();
+                //To prevent program from going to background
                 activity.getGLSurfaceView().requestFocus();
                 return true;
             default:
@@ -211,6 +212,11 @@ public class Cocos2dxEditBox extends EditText {
         }
     }
 
+    @Override
+    public boolean onKeyPreIme(int keyCode, KeyEvent event) {
+        return super.onKeyPreIme(keyCode, event);
+    }
+
     public void setInputFlag(int inputFlag) {
 
         switch (inputFlag) {

cocos/platform/android/java/src/org/cocos2dx/lib/Cocos2dxEditBoxHelper.java

@@ -101,7 +101,9 @@ public class Cocos2dxEditBoxHelper {
 
                     @Override
                     public void onTextChanged(final CharSequence s, int start, int before, int count) {
-                        mFrameLayout.setEnableForceDoLayout(false);
+                        //The optimization can't be turn on due to unknown keyboard hide in some custom keyboard
+//                        mFrameLayout.setEnableForceDoLayout(false);
+
                         mCocos2dxActivity.runOnGLThread(new Runnable() {
                             @Override
                             public void run() {