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I have an Activity where I call another Activity using the startActivityForResult.
In the Activity that was called, I have a list filled by products already registered.
In this list, I needed to, when clicking on some of the products on the list, return the product to the previous Activity.
The problem is: by clicking on the list item, I cannot retrieve it and return it as a result for the previous Activity.
//Classe CadPreVenda.Java
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item){
switch (item.getItemId()) {
case ADICIONAR:
Toast.makeText(CadPreVenda.this, "Clicou em ADD", Toast.LENGTH_LONG).show();
Log.d(TAG,"Log: Clicou em add");
Intent i = new Intent(CadPreVenda.this, pvConsProduto.class);
startActivityForResult(i, 1);
return true;
case CANCELAR:
Toast.makeText(CadPreVenda.this, "Clicou em CANCELAR", Toast.LENGTH_LONG).show();
Log.d(TAG,"Log: Clicou em CANCELAR");
return true;
case SALVAR:
Toast.makeText(CadPreVenda.this, "Clicou em SALVAR", Toast.LENGTH_LONG).show();
Log.d(TAG,"Log: CLICOU EM SALVAR");
return true;
}
return false;
}
//verifica se usuário confirmou a inclusão de algum item
public void onActivityResult(int requestCode, int resultCode, Intent it) {
if(it == null){
Context contexto = getApplicationContext();
int duracao = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(contexto, "Atenção! Produto não incluído!",duracao);
toast.show();
Log.d(TAG, "Cancelou o processo.");
Log.d(TAG, "Erro: Processo Abortado." );
}
else{
Bundle params = it !=null ? it.getExtras(): null;
if (params != null){
String produto = params.getString("produto");
Log.d(TAG, "Produto Add: "+produto);
}
}
In this class, I load the list of products and try to return the return to the previous Activity.
package br.sysandroid;
import java.util.List;
import br.sysandroid.dao.Lcm001DAO;
import br.sysandroid.dao.ProdutoAdapter;
import br.sysandroid.dao.banco.BancoDAO;
import br.sysandroid.model.LCM001;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
public class pvConsProduto extends ListActivity{
Button btPesquisar, btSair;
private Lcm001DAO ProdutoDAO;
List<LCM001> produtos;
ProdutoAdapter adapter;
BancoDAO bancoDAO;
public static final String TAG = "LOGVENDAS";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.consproduto);
bancoDAO = new BancoDAO(this);
//Código que não é relevante para o problema
@Override
protected void onListItemClick(ListView list, View v, int position, long id) {
super.onListItemClick(list, v, position, id);
try {
Intent it = new Intent();
it.putExtra("produto",produtos.get(position));
Log.d(TAG, "Adicionando produto: "+produtos.get(position));
setResult(RESULT_OK,it);
finish();
} catch (Exception e) {
e.printStackTrace();
Log.d(TAG, "Algum erro aconteceu");
}
}
@Override
protected void onResume() {
ProdutoDAO = new Lcm001DAO(this);
ProdutoDAO.open();
//Lê produtos do banco
produtos = ProdutoDAO.lerProdutos();
//seta produtos na lista
ListView listaProduto = (ListView) findViewById(android.R.id.list);
//ListView listaProduto = getListView();
adapter = new ProdutoAdapter(this, produtos);
listaProduto.setAdapter(adapter);
super.onResume();
}
}
When clicking on any of the items in the list, Log get that:
10-31 09:08:47.002: D/LOGVENDAS(1663): Adicionando produto: br.sysandroid.model.LCM001@b2e9e0a8
10-31 09:08:47.212: D/GRAVANDOLOGS(1663): Produto Add: null
And generates this warn in the Logcat:
10-31 09:08:37.232: W/Bundle(1663): Key produto expected String but value was a br.sysandroid.model.LCM001. The default value <null> was returned.
10-31 09:08:37.322: W/Bundle(1663): Attempt to cast generated internal exception:
10-31 09:08:37.322: W/Bundle(1663): java.lang.ClassCastException: br.sysandroid.model.LCM001 cannot be cast to java.lang.String
10-31 09:08:37.322: W/Bundle(1663): at android.os.Bundle.getString(Bundle.java:1121)
10-31 09:08:37.322: W/Bundle(1663): at br.sysandroid.CadPreVenda.onActivityResult(CadPreVenda.java:107)
10-31 09:08:37.322: W/Bundle(1663): at android.app.Activity.dispatchActivityResult(Activity.java:5423)
10-31 09:08:37.322: W/Bundle(1663): at android.app.ActivityThread.deliverResults(ActivityThread.java:3361)
10-31 09:08:37.322: W/Bundle(1663): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3408)
10-31 09:08:37.322: W/Bundle(1663): at android.app.ActivityThread.access$1300(ActivityThread.java:135)
10-31 09:08:37.322: W/Bundle(1663): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
10-31 09:08:37.322: W/Bundle(1663): at android.os.Handler.dispatchMessage(Handler.java:102)
10-31 09:08:37.322: W/Bundle(1663): at android.os.Looper.loop(Looper.java:136)
10-31 09:08:37.322: W/Bundle(1663): at android.app.ActivityThread.main(ActivityThread.java:5017)
10-31 09:08:37.322: W/Bundle(1663): at java.lang.reflect.Method.invokeNative(Native Method)
10-31 09:08:37.322: W/Bundle(1663): at java.lang.reflect.Method.invoke(Method.java:515)
10-31 09:08:37.322: W/Bundle(1663): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
10-31 09:08:37.322: W/Bundle(1663): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
10-31 09:08:37.322: W/Bundle(1663): at dalvik.system.NativeStart.main(Native Method)
Check your code, especially where the product variable is returning a null value. This is causing the error: 10-31 09:08:37.232: W/Bundle(1663): Key product expected String but value was a br.sysandroid.model.LCM001. The default value <null> was returned. The variable expects a value of type String and is returning null.
– Israel Sousa