Force fermée lors de la mise en œuvre de l'entrée en tant qu'action

Question

J'ai essayé d'utiliser entrer dans EditText comme une action, mais je force toujours fermée. S'il vous plaît dites-moi savoir où est le mauvais code de mon programme.

Voici mon code.

noteField = (EditText)findViewById(R.id.noteNote); 
noteField.setOnKeyListener(new View.OnKeyListener() { 
    @Override 
    public boolean onKey(View v, int keyCode, KeyEvent event) { 
     if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)){ 
      builder.setTitle("Saved") 
        .setMessage("Confirm saved notes?") 
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface dialog, int which) { 
          onSaved(); 
         } 
        }) 
        .setNegativeButton("No", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface dialog, int which) { 
          finish(); 
         } 
        }) 
        .setNeutralButton("Not yet", new DialogInterface.OnClickListener() { 
         @Override 
         public void onClick(DialogInterface dialog, int which) { 
          dialog.cancel(); 
         } 
        }).setCancelable(true).show(); 
      return true; 
     } 
     return false; 
    } 
}); 

Logcat.

FATAL EXCEPTION: main 
    Process: com.fstudio.kamussakumatematika, PID: 28936 
    java.lang.NullPointerException 
     at com.fstudio.kamussakumatematika.NewNote$1.onKey(NewNote.java:35) 
     at android.view.View.dispatchKeyEvent(View.java:7706) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1446) 
     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2076) 
     at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1531) 
     at android.app.Activity.dispatchKeyEvent(Activity.java:2451) 
     at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:547) 
     at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59) 
     at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:319) 
     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2003) 
     at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4436) 
     at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4404) 
     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3958) 
     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4008) 
     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3977) 
     at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4084) 
     at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3985) 
     at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4141) 
     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3958) 
     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4008) 
     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3977) 
     at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3985) 
     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3958) 
     at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6290) 
     at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6253) 
     at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6207) 
     at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3744) 
     at android.os.Handler.dispatchMessage(Handler.java:110) 
     at android.os.Looper.loop(Looper.java:193) 
     at android.app.ActivityThread.main(ActivityThread.java:5299) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641) 
     at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Initialisez le AlertDialog.Builder comme suit avant de l'utiliser.

@Override 
public boolean onKey(View v, int keyCode, KeyEvent event) { 
    if ((event.getAction() == KeyEvent.ACTION_UP) && (keyCode == KeyEvent.KEYCODE_ENTER)){ 
     AlertDialog.Builder builder = new AlertDialog.Builder(YourActivity.this); 
     ... 
    } 
}