activity生命周期

acitvity状态

运行状态
暂停状态
停止状态

activity生命周期图

非用户行为把activity不可见的时候，例如电话忽然来了==
        /**
         * 重新创建恢复缓存的数据
         */
        @Override
        protected void onRestoreInstanceState(Bundle savedInstanceState) {
                Log.i("onRestoreInstanceState",savedInstanceState.getString("name"));
                super.onRestoreInstanceState(savedInstanceState);
        }

        /**
         * 被摧毁前保存缓存的一些数据
         */
        @Override
        protected void onSaveInstanceState(Bundle outState) {
                outState.putString("name", "谭建平");
                super.onSaveInstanceState(outState);
        }