关于“回收器视图”的错误。没有连接适配器，跳过布局“

Question

我有一些关于适配器的问题，这是我的loadData()方法：

public class MainActivity extends AppCompatActivity {
private static final String URL_DATA = "http://api.openweathermap.org/data/2.5/weather?q=Malang&appid=2c869002c83226532f2ac719d5c80c49";

private RecyclerView mRecyclerView;
private RecyclerView.Adapter adapter;
ArrayList<List> listItem;

private void loadData (){
    final ProgressDialog progressDialog = new ProgressDialog(this) ;
    progressDialog.setMessage("Loading Data");
    progressDialog.show();

    StringRequest stringRequest = new StringRequest(Request.Method.POST,
            URL_DATA,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String s) {
                    progressDialog.dismiss();
                    try {
                        JSONObject jobj = new JSONObject(s);
                        JSONArray array = jobj.getJSONArray("weather");

                        for (int i=0; i<array.length(); i++){
                            JSONObject obj = array.getJSONObject(i);
                            List item = new List(
                                    obj.getString("description"),
                                    obj.getString("main"),
                                    obj.getString("base")
                            );
                            listItem.add(item);
                        }
                        adapter = new CustomAdapter(getApplicationContext(), listItem);
                        mRecyclerView.setAdapter(adapter);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    progressDialog.dismiss();
                    Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
  }
}

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listItem = new ArrayList<>();
    adapter = new CustomAdapter(MainActivity.this, listItem);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setAdapter(adapter);
    loadData();
}

另一个Java：1。名单。Java

public class List {
//public int gambar;
public String nama;
public String suhu;
public String kelembapan;
public List (String nama, String suhu, String kelembapan) {

    this.nama = nama;
    this.suhu = suhu;
    this.kelembapan = kelembapan;
}
public String getNama(){
    return nama;
}
public String getSuhu(){
    return suhu;
}
public String getkelembapan(){
    return kelembapan;
}

}

Answer 1

尝试使用mainactivity.this而不是GetApplicationContext()

在设置Adater之前，还要将Layout Manager设置为代码

mRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));