设置一个全局List 一个类赋值 另一个类取值 每次取值都是空的什么原因

[星抹微云]

public class MainActivity extends AppCompatActivity implements MyAdapter.OnMyItemClickListener {

    private RecyclerView recycler;
    private MyAdapter adapter;

    public List<String> list1 = new ArrayList<String>();  //这里全局

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        recycler = (RecyclerView) findViewById(R.id.recycler);
        onTestGet();

        adapter = new MyAdapter(this,List);  //这里List取值
        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
        recycler.setLayoutManager(staggeredGridLayoutManager);
        recycler.setAdapter(adapter);
        adapter.setOnMyItemClickListener(this);
    }

    @Override
    public void onMyItemClick(RecyclerView parent, View view, int position, String data) {
        Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
        
    }

   
    public void onTestGet(){
       

        try{
            RequestParams params = new RequestParams("http://192.168.108.175:8080/WebServer/main.action");

            x.http().get(params, new Callback.CommonCallback<String>() {
                @Override
                public void onSuccess(String s) {
                    

                    Pattern p = Pattern.compile("(\\[[^\\]]*\\])");
                    Matcher m = p.matcher(s);

                    while(m.find()){
                        list1.add(m.group().substring(1, m.group().length()-1)); //这里List赋值
                    }

                }

                private ArrayList<String> dataList;

                @Override
                public void onError(Throwable throwable, boolean b) {
                       
                }

                @Override
                public void onCancelled(CancelledException e) {

                }

                @Override
                public void onFinished() {

                }
            });
        }catch (Exception e){
            e.printStackTrace();
        }

    }
}

[jklwan]

onTestGet()是异步操作，你需要在返回数据之后再刷新adapter或者初始化，就是在onSuccess中初始化adapter，然后设置adapter

[zhang106209]

数据加载完成后，刷新adapter

[星抹微云]

能给下具体代码吗？

[zhang106209]

就在你onSuccess（）方法里，写在最后面adapter.notifyDataSetChanged()

[星抹微云]

非常感谢，本人小白