Ошибка при нажатии PositiveButton в AlertDialog [Android]

Question

Когда я нажимаю на положительную кнопку этого диалогового окна предупреждения, приложение выходит из строя. Что-то не так с этим кодом? Я чувствую, что флажки не назначены правильно.

private void showSmimeSettings(){ 

    AlertDialog.Builder smimeBuilder = new AlertDialog.Builder(this); 
    smimeBuilder.setTitle("S/MIME Settings"); 

    LayoutInflater inflator = getLayoutInflater(); 
    View checkboxLayout = inflator.inflate(R.layout.smime_settings_checkbox, null); 
    smimeBuilder.setView(checkboxLayout); 

    final CheckBox signed_checkbox = (CheckBox) findViewById(R.id.signed_checkBox); 
    final CheckBox encrypted_checkbox = (CheckBox) findViewById(R.id.encrypted_checkBox); 


    smimeBuilder.setPositiveButton("Save", new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface arg0, int arg1) { 
      if (signed_checkbox.isChecked()) { 
       mIsSigned = true; 
      } else { 
       mIsSigned = false; 
      } 
      if (encrypted_checkbox.isChecked()) { 
       mIsEncrypted = true; 
      } else { 
       mIsEncrypted = false; 
      } 
     } 
    }); 

    AlertDialog smimeDialog = smimeBuilder.create(); 
    smimeDialog.show();  
} 

Log:

06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): Thread uncaught exception: 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): java.lang.NullPointerException 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at com.android.lexperts.email.activity.MessageCompose$7.onClick(MessageCompose.java:1647) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at android.os.Looper.loop(Looper.java:137) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at android.app.ActivityThread.main(ActivityThread.java:5039) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at java.lang.reflect.Method.invokeNative(Native Method) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at java.lang.reflect.Method.invoke(Method.java:511) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
06-14 17:08:59.041: E/com.fm.sg.android.sgApplication(4131): at dalvik.system.NativeStart.main(Native Method) 
06-14 17:08:59.041: E/ACRA(4131): ACRA caught a NullPointerException exception for com.fm.sg.android. Building report. 
06-14 17:09:02.252: E/ACRA(4131): com.fm.sg.android fatal error : null 
06-14 17:09:02.252: E/ACRA(4131): java.lang.NullPointerException 
06-14 17:09:02.252: E/ACRA(4131): at com.android.lexperts.email.activity.MessageCompose$7.onClick(MessageCompose.java:1647) 
06-14 17:09:02.252: E/ACRA(4131): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 
06-14 17:09:02.252: E/ACRA(4131): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-14 17:09:02.252: E/ACRA(4131): at android.os.Looper.loop(Looper.java:137) 
06-14 17:09:02.252: E/ACRA(4131): at android.app.ActivityThread.main(ActivityThread.java:5039) 
06-14 17:09:02.252: E/ACRA(4131): at java.lang.reflect.Method.invokeNative(Native Method) 
06-14 17:09:02.252: E/ACRA(4131): at java.lang.reflect.Method.invoke(Method.java:511) 
06-14 17:09:02.252: E/ACRA(4131): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
06-14 17:09:02.252: E/ACRA(4131): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
06-14 17:09:02.252: E/ACRA(4131): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Я думаю, вы должны получить ваши флажки после накачивания макета.

LayoutInflater inflator = getLayoutInflater(); 
View checkboxLayout = inflator.inflate(R.layout.smime_settings_checkbox, null); 

final CheckBox signed_checkbox = (CheckBox) checkboxLayout.findViewById(R.id.signed_checkBox); 
final CheckBox encrypted_checkbox = (CheckBox) checkBoxLayout.findViewById(R.id.encrypted_checkBox); 

Answer 2

private void showSmimeSettings(){ 

    AlertDialog.Builder smimeBuilder = new AlertDialog.Builder(this); 
    smimeBuilder.setTitle("S/MIME Settings"); 

    LayoutInflater inflator = getLayoutInflater(); 
    View checkboxLayout = inflator.inflate(R.layout.smime_settings_checkbox, null); 

    smimeBuilder.setView(checkboxLayout); 
    final CheckBox signed_checkbox = (CheckBox) checkboxLayout.findViewById(R.id.signed_checkBox); 
    final CheckBox encrypted_checkbox = (CheckBox) checkboxLayout.findViewById(R.id.encrypted_checkBox); 


    smimeBuilder.setPositiveButton("Save", new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface arg0, int arg1) { 
      if (signed_checkbox.isChecked()) { 
       mIsSigned = true; 
      } else { 
       mIsSigned = false; 
      } 
      if (encrypted_checkbox.isChecked()) { 
       mIsEncrypted = true; 
      } else { 
       mIsEncrypted = false; 
      } 
     } 
    }); 

    AlertDialog smimeDialog = smimeBuilder.create(); 
    smimeDialog.show();  
} 

Layout

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <CheckBox 
     android:id="@+id/signed_checkBox" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="CheckBox" 
     /> 

    <CheckBox 
     android:id="@+id/encrypted_checkBox" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="CheckBox" /> 

</LinearLayout>