onDestory进行释放Handler时，需要判断null

if(null != mHandler) {
            mHandler.removeMessages(MSG_CHANGE_TEXT_COLOR);
            mHandler.removeMessages(MSG_JUMP_TO_SUCCESS_PAGE);
            mHandler.removeMessages(MSG_PLAY_LITTLE_PEOPLE_ANIMATION);
            mHandler.removeMessages(MSG_PLAY_WRONG_ANIMATION);
            mHandler.removeMessages(MSG_SPEAK_BUTTON_STATE_CHANGED);
            mHandler = null;
            DebugLog.d(TAG, "release Handler success");
}

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