防止暂停的Activity回收后数据丢失

Activity回收前,一定会调用onSaveInstanceState(),可以在这个方法中保存数据

重写这个方法,代码如下:

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString("name","张三");
    }

在Activity的onCreate方法中取出数据

     if(savedInstanceState!=null)
        {
            String data=savedInstanceState.getString("data_key");
            Log.d("tag","test");
        }