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PORetrieving Value from EditText in DialogFragment
 

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    <p>I'm going through Google's Android Developer page on Dialogs, specifically <a href="http://developer.android.com/guide/topics/ui/dialogs.html#PassingEvents" rel="noreferrer">this</a> section. However, instead of creating the DialogFragment's message programmatically, I made a pre-set layout named <code>layout_newpayperiod.xml</code> with the following elements:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;Spinner android:id="@+id/spinner_payperiod" android:layout_width="fill_parent" android:layout_height="48dp" android:padding="8dp" android:entries="@array/pay_periods" /&gt; &lt;EditText android:id="@+id/edittext_savepercent" android:layout_width="fill_parent" android:layout_height="48dp" android:padding="8dp" android:inputType="number" android:hint="Percent to Save" /&gt; &lt;EditText android:id="@+id/edittext_payment" android:layout_width="fill_parent" android:layout_height="48dp" android:padding="8dp" android:inputType="numberDecimal" android:hint="Total Payment" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>When I call the DialogFragment it shows up as normal, with the Spinner having the proper values. I filled in the entries and hit "OK", but when I try to retrieve the values from the Spinner and two EditText fields, the app forces close with a <code>NumberFormatException: Invalid double ""</code>. I get the feeling I'm not retrieving the Views properly. Can anyone help me figure this out please? Thanks!</p> <pre><code>public class StartPayperiodDialogFragment extends DialogFragment { /* The activity that creates an instance of this dialog fragment must * implement this interface in order to receive event callbacks. * Each method passees the DialogFragment in case the host needs to query it. */ public interface StartPayperiodDialogListener{ public void onDialogPositiveClick(DialogFragment dialog); public void onDialogNegativeClick(DialogFragment dialog); } // Use this instance of the interface to deliver action events StartPayperiodDialogListener listener; // Override the Fragment.onAttach() method to instantiate the StartPayperiodDialogListener @Override public void onAttach(Activity activity){ super.onAttach(activity); // Verify that the host activity implements the callback interface try{ // Instantiate the NoticeDialogListener so we can send events to the host listener = (StartPayperiodDialogListener) activity; }catch(ClassCastException e){ // The activity doesn't implement the interface, throw exception throw new ClassCastException(activity.toString() + " must implement StartPayperiodDialogListener"); } } @Override public Dialog onCreateDialog(Bundle savedInstanceState){ // Use the Builder class for convenient dialog construction AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); View transactionLayout = View.inflate(getActivity(), R.layout.layout_newpayperiod, null); builder.setView(transactionLayout) .setPositiveButton("OK", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // Send the positive button event back to the calling activity listener.onDialogPositiveClick(StartPayperiodDialogFragment.this); } }) .setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // Send the negative button event back to the calling activity listener.onDialogNegativeClick(StartPayperiodDialogFragment.this); } }); return builder.create(); } </code></pre> <p>}</p> <p>In MainActivity.class, the callback method:</p> <pre><code>@Override public void onDialogPositiveClick(DialogFragment dialog) { // User pressed OK, so we need to grab the values from the // dialog's fields and apply them to the Views in the Main // Activity View transactionLayout = View.inflate(this, R.layout.layout_newpayperiod, null); // Start with the payment amount EditText paymentEt = (EditText) transactionLayout.findViewById(R.id.edittext_payment); TextView paymentTv = (TextView) findViewById(R.id.text_paycheck); paymentTv.setText(moneyFormat.format(Double.parseDouble(paymentEt.getText().toString()))); // Next, the percent to save EditText savingsEt = (EditText) transactionLayout.findViewById(R.id.edittext_savepercent); TextView savingsTv = (TextView) findViewById(R.id.text_savings); savingsTv.setText(savingsEt.getText().toString() + "%"); // Then, the pay period Spinner periodSp = (Spinner) transactionLayout.findViewById(R.id.spinner_payperiod); TextView periodTv = (TextView) findViewById(R.id.text_payperiod); periodTv.setText(periodSp.getSelectedItem().toString()); // Finally, let's update the daily allowance amount and clear // the adapter adapter.clear(); adapter.notifyDataSetChanged(); TextView allowanceTv = (TextView) findViewById(R.id.text_allowance); Double allowanceValue; switch(periodSp.getSelectedItemPosition()){ case(0): // Daily allowanceValue = Double.parseDouble(paymentTv.getText().toString()); break; case(1): // Weekly allowanceValue = Double.parseDouble(paymentTv.getText().toString()) / 7; break; case(2): // 2 Weeks allowanceValue = Double.parseDouble(paymentTv.getText().toString()) / 14; break; case(3): // 30 Days allowanceValue = Double.parseDouble(paymentTv.getText().toString()) / 30; break; default: // Debugging purposes only allowanceValue = 42.0; break; } allowanceTv.setText(Double.toString(allowanceValue)); } </code></pre>
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