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POhow to implement OnCancel listener in android
 

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    <pre><code>public class ModalityDialog extends Dialog implements OnClickListener, OnCancelListener { EditText capacity ; EditText color ; Button modal_ok ; String Capacity; String Color; public ModalityDialog(Context context) { super(context); /** It will hide the title */ requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.preferences); capacity = (EditText)findViewById(R.id.capacityInput); color = (EditText)findViewById(R.id.ColorInput); Button modal_ok = (Button)findViewById(R.id.modality_ok); modal_ok.setOnClickListener(this); } @Override public void onClick(View v) { if (v == modal_ok){ cancel(); } } @Override public void onCancel( DialogInterface dialog ){ if( dialog == this){ Capacity = capacity.getText().toString(); Color = color.getText().toString(); } } } </code></pre> <p>I call it as follows where modal is a button</p> <pre><code>modal.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ModalityDialog modalDialog = new ModalityDialog(InputInfo.this); modalDialog.show();} }); </code></pre> <p>I am getting the following error</p> <pre><code>11-19 03:30:00.733: E/AndroidRuntime(305): FATAL EXCEPTION: main 11-19 03:30:00.733: E/AndroidRuntime(305): java.lang.NullPointerException 11-19 03:30:00.733: E/AndroidRuntime(305): at com.domain.ActivityEx.ModalityDialog. &lt;init&gt;(ModalityDialog.java:38) 11-19 03:30:00.733: E/AndroidRuntime(305): at com.domain.ActivityEx.InputInfo$1.onClick(InputInfo.java:57) 11-19 03:30:00.733: E/AndroidRuntime(305): at android.view.View.performClick(View.java:2408) 11-19 03:30:00.733: E/AndroidRuntime(305): at android.view.View$PerformClick.run(View.java:8816) 11-19 03:30:00.733: E/AndroidRuntime(305): at android.os.Handler.handleCallback(Handler.java:587) 11-19 03:30:00.733: E/AndroidRuntime(305): at android.os.Handler.dispatchMessage(Handler.java:92) 11-19 03:30:00.733: E/AndroidRuntime(305): at android.os.Looper.loop(Looper.java:123) 11-19 03:30:00.733: E/AndroidRuntime(305): at android.app.ActivityThread.main(ActivityThread.java:4627) 11-19 03:30:00.733: E/AndroidRuntime(305): at java.lang.reflect.Method.invokeNative(Native Method) 11-19 03:30:00.733: E/AndroidRuntime(305): at java.lang.reflect.Method.invoke(Method.java:521) 11-19 03:30:00.733: E/AndroidRuntime(305): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 11-19 03:30:00.733: E/AndroidRuntime(305): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 11-19 03:30:00.733: E/AndroidRuntime(305): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I want to get the values of variables Capacity, Color, etc. after onCancel function has been called. Right now the dialog box hangs and finishes before putting the values in the variables. Can anyone suggest how can I do so ?</p> <p>Thanks in advance</p>
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    1. COWhat do mean 'hangs'? The dialog isn't dismissed?
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    2. COBy 'hangs' I meant that I get an error
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    3. COPost the error please.
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