当按钮的setOnClickListener在两个时间执行

Question

我按下活动和setOnClickListener上的按钮我有一个方法去从一个url获取数据，然后我尝试将它保存在一个数组中，但是当我单击我第一次没有得到任何东西，但如果我回去再次点击，我得到的数据。

package com.example.fabio.domoticaa; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
import android.util.SparseBooleanArray; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 

import com.android.volley.Request; 
import com.android.volley.RequestQueue; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.JsonArrayRequest; 
import com.android.volley.toolbox.Volley; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 

public class AddCenario extends AppCompatActivity { 
    String input,pls, kappa; 
    Integer podeIR = 0,x; 
    EditText editText,esc; 
    String idDivisao; 
    private String my_sel_items; 
    ArrayAdapter adapter; 
    String[] id = new String[1]; 
    ArrayList<String> getid = new ArrayList<String>(); 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     final ArrayList<String> divisoes = new ArrayList<>(); 
     my_sel_items=new String(); 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_add_cenario); 
     editText = (EditText) findViewById(R.id.editText4); 
     final ListView listView = (ListView) findViewById(R.id.listview); 

     Button btnCriar = (Button) findViewById(R.id.button_criarr); 


     RequestQueue queue = Volley.newRequestQueue(AddCenario.this.getApplicationContext()); 
     try { 
      String url = "http://brunos.000webhostapp.com/teste/listar_divisoes.php"; 
      JsonArrayRequest jsonRequest = new JsonArrayRequest 
        (Request.Method.GET, url, null, new Response.Listener<JSONArray>() { 
         public void onResponse(JSONArray response) { 
          try { 
           adapter = new ArrayAdapter(getApplicationContext(),R.layout.custom_divi_mult,divisoes); 
           Integer i = 0; 
           String divisao; 
           while (i!= response.length()){ 
            JSONObject obj = response.getJSONObject(i); 
            idDivisao = obj.getString("id"); 
            divisao = obj.getString("descricao"); 
            divisoes.add(divisao);i++; 
           } 
           listView.setAdapter(adapter); 

          } catch (JSONException e) { 
           e.printStackTrace(); 
          } 
         } 
        }, new Response.ErrorListener() { 

         @Override 
         public void onErrorResponse(VolleyError error) { 
          error.printStackTrace(); 
         } 
        }); 
      queue.add(jsonRequest); 
     } catch (Exception ex) { 
     } finally { 
     } 



     btnCriar.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       SparseBooleanArray checked = listView.getCheckedItemPositions(); 
       ArrayList<String> selectedItems = new ArrayList<String>(); 
       for (int i = 0; i < checked.size(); i++) { 
        // Item position in adapter 
        int position = checked.keyAt(i); 
        // Add sport if it is checked i.e.) == TRUE! 
        if (checked.valueAt(i)) 
         selectedItems.add((String) adapter.getItem(position)); 
       } 

       final String[] outputStrArr = new String[selectedItems.size()]; 

       for (int i = 0; i < selectedItems.size(); i++) { 
        outputStrArr[i] = selectedItems.get(i); 
       } 



       test1(outputStrArr); 

       String[] teste = new String[getid.size()]; 

       for (int f = 0; f < getid.size();f++){ 
        teste[f] = getid.get(f); 
       } 

       for (int va = 0; va < teste.length;va++){ 
        pls +=teste[va]; 

       } 
       editText.setText(pls); 

       Intent x = new Intent(AddCenario.this, GerirCenario.class); 
       Bundle b = new Bundle(); 


       b.putStringArray("selectedItems", outputStrArr); 
       String text = editText.getText().toString(); 
       x.putExtra("ola" , text); 
       x.putExtras(b); 
       startActivity(x); 
       listView.getSelectedItem(); 
      } 
     }); 

    } 


    public void test1 (String[] outputStrArr){ 
     Log.e("teste", String.valueOf(outputStrArr.length)); 
     for (x = 0; x < outputStrArr.length;x++) { 
      try { 

       RequestQueue queue = Volley.newRequestQueue(AddCenario.this); 

       String url = "http://brunos.000webhostapp.com/teste/obter_id.php?descricao=" + outputStrArr[x] ; 

       JsonArrayRequest jsonRequest = new JsonArrayRequest 
         (Request.Method.GET, url, null, new Response.Listener<JSONArray>() { 
          @Override 
          public void onResponse(JSONArray response) { 
           try { 
            for (int i = 0; i < response.length(); ++i) { 
             JSONObject obj = response.getJSONObject(i); 
             id[0] = obj.getString("id"); 
             getid.add(id[0]); 
            } 

           } catch (JSONException e) { 
            e.printStackTrace(); 
           } 
          } 
         }, new Response.ErrorListener() { 

          @Override 
          public void onErrorResponse(VolleyError error) { 
           error.printStackTrace(); 
          } 
         }); 
       queue.add(jsonRequest); 

      } catch (Exception ex) { 
      } 
     } 
    } 

} 

Answer 1

这是因为您的JsonArrayRequest是异步的。您可以在onResponse之内获得您的数据。因此，你对数据的处理也应该放在那里。否则，您不必等待JsonArrayRequest完成其响应（检索您的数据）即可进入数据逻辑。

低于test1(outputStrArr)一切，与加工做/演技上的新数据outputStrArr

String[] teste = new String[getid.size()]; 
    ... 
listView.getSelectedItem(); 

应该被移动到onResponse

public void onResponse(JSONArray response) { 
    try { 
     for (int i = 0; i < response.length(); ++i) { 
      JSONObject obj = response.getJSONObject(i); 
      id[0] = obj.getString("id"); 
      getid.add(id[0]); 
     } 
     // MOVE YOUR STUFF TO HERE 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
}