我有ListView，我用适配器类填充了这个ListView的值。现在我想在另一个活动中显示选定的行值。如何做？
我的活动：
public class SimplePurchaseOrderActivity extends AppCompatActivity {
protected FrameLayout frameLayout;
SharedPreferences sharedPrefUser;
SharedPreferences.Editor editor;
private ListView purchaseOrderListView;
SimplePurchaseOrderAdapter simplePurchaseOrderAdapter;
ArrayList<PoHeadersBO> poHeadersBOs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.simple_purchase_order)
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
purchaseOrderListView=(ListView) findViewById(R.id.purchaseOrderListView);
searchPOOrders=(Button) findViewById(R.id.btnPOSearch);
searchSupplier=(EditText) findViewById(R.id.searchPOEditText);
edtFromDate=(EditText) findViewById(R.id.poFromDate);
edtToDate=(EditText) findViewById(R.id.poToDate);
sharedPrefUser = getSharedPreferences(ISharedPreferencesUtil.SHARED_USER_MANAGEMENT, 0);
editor = sharedPrefUser.edit();
new GetPurchaseOrders(IUrlsUtil.URL_PURCHASE_ORDERS).execute();
***purchaseOrderListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Object obj = purchaseOrderListView.getItemAtPosition(position);
//here is the problem ... please check the console error below.
String purchaseOrderNumber = ((PoHeadersBO) obj).getPoNumber().toString();
String supplierName=((PoHeadersBO) obj).getSupplierId().toString();
ArrayList<PoDetailsBO> poDetails=((PoHeadersBO) obj).getPoDetails();
Intent iPODetails = new Intent(SimplePurchaseOrderActivity.this, PurchaseOrderReportActivity.class);
iPODetails.putExtra("poNumber", purchaseOrderNumber);
iPODetails.putExtra("supplierName", supplierName);
iPODetails.putExtra("poDetails", poDetails);
startActivity(iPODetails);
}
});***
}
class GetPurchaseOrders extends AsyncTask<String, String, String> {
ProgressDialog pDialog;
ResultVO getPurchaseOrderResponse;
String param;
PurchaseOrderArrayListBO purchaseOrderArrayListBO;
GetPurchaseOrders(String param) {
this.param = param;
}
@Override
protected void onPreExecute() {
pDialog = new ProgressDialog(SimplePurchaseOrderActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... params) {
try {
YGTHeaderParms ygtHeaderParms = ICommonMethods.setHeaderParams(SimplePurchaseOrderActivity.this);
APIServicesImpl services = new APIServicesImpl();
getPurchaseOrderResponse = services.get(PurchaseOrderArrayListBO.class, param, ygtHeaderParms);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String file_url) {
if (pDialog.isShowing()) {
pDialog.dismiss();
}
if (getPurchaseOrderResponse != null) {
String authToken = getPurchaseOrderResponse.getAuthToken();
if (authToken != null) {
editor.putString(ISharedPreferencesUtil.AUTH_TOKEN, authToken);
editor.commit();
}
if (getPurchaseOrderResponse.getAppStatusCode() == Constants.APP_STATUS_CODE_SUCCESS) {
purchaseOrderArrayListBO = (PurchaseOrderArrayListBO) getPurchaseOrderResponse.getPayload();
poHeadersBOs = purchaseOrderArrayListBO.getPurchaseOrderList();
if (poHeadersBOs != null) {
simplePurchaseOrderAdapter = new SimplePurchaseOrderAdapter(SimplePurchaseOrderActivity.this, poHeadersBOs);
purchaseOrderListView.setAdapter(simplePurchaseOrderAdapter);
} else {
ExceptionMessages.showAlertDialog(SimplePurchaseOrderActivity.this, "No response from server", "Unable to get records", true);
}
} else {
if (poHeadersBOs != null) {
poHeadersBOs.clear();
simplePurchaseOrderAdapter.notifyDataSetChanged();
}
}
} else {
ExceptionMessages.showAlertDialog(SimplePurchaseOrderActivity.this, IExceptionUtil.NULL_RESPONSE_TITLE, IExceptionUtil.NULL_RESPONSE_MESSAGE, true);
}
}
}
}
我的错误输出是这样的：
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: FATAL EXCEPTION: main
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: Process: com.yougotag.pharmainventory, PID: 12980
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: java.lang.ClassCastException: java.lang.Integer cannot be cast to com.ygt.aroga.common.bo.PoHeadersBO
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at com.yougotag.pharmatenant.SimplePurchaseOrderActivity$5.onItemClick(SimplePurchaseOrderActivity.java:181)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.widget.AdapterView.performItemClick(AdapterView.java:299)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.widget.AbsListView.performItemClick(AbsListView.java:1152)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.widget.AbsListView$PerformClick.run(AbsListView.java:3014)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.widget.AbsListView$3.run(AbsListView.java:3865)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:808)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:103)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.os.Looper.loop(Looper.java:193)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5333)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:515)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
11-17 15:20:58.824 12980-12980/com.yougotag.pharmainventory E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
这是在课堂上发生的主要错误，我在活动中评论过。它正在运行的一些课程。这是不行的
答案 0 :(得分：0)
尝试更改此内容：
Object obj = purchaseOrderListView.getItemAtPosition(position);
到
Object obj = parent.getItemAtPosition(position);
答案 1 :(得分：0)
您应该从适配器下面的对象获取数据，而不是从ListView中获取数据。
因此，如果您的Adapater数据源是poHeadersBOs，您应该从那里获取它：
PoHeadersBO poHeadersBOsItem = poHeadersBOs.get(position);