AlertDialog.Builder builder;
      final AlertDialog dialog;

      final Context mContext = MainActivity.this;

      LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
      //View layout = inflater.inflate(R.layout.enroll_dialog, (ViewGroup)findViewById(R.id.enroll_layout_root));
      View layout = inflater.inflate(R.layout.test_dialog, null);

      final EditText enrolleditText = (EditText)layout.findViewById(R.id.test_editText);

      builder = new AlertDialog.Builder(mContext);
      builder.setView(layout);
      builder.setPositiveButton(android.R.string.ok, null); //Set to null. We override the onclick
      builder.setNegativeButton(android.R.string.cancel, null);
      dialog = builder.create();
      dialog.show();

      //Overriding the handler immediately after show is probably a better approach than OnShowListener as described below
      dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener()
      {
         @Override
         public void onClick(View v)
         {
            String getId = enrolleditText.getText().toString();
            if (!(getId.isEmpty()))
            {
               Toast.makeText(mContext,"success",Toast.LENGTH_SHORT).show();
               dialog.dismiss();
            } else {
               //return;
               Toast.makeText(mContext,"insert name",Toast.LENGTH_SHORT).show();
            }
         }
      });

      dialog.getButton(AlertDialog.BUTTON_NEGATIVE).setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View v) {
            dialog.dismiss();
         }
      });

안드로이드 첫 액티비티(Launcher)에서 인텐트 수신

그냥 이런식으로 받게되면

String phase = getIntent().getStringExtra("phase");

null 값 오류가 발생

번들을 먼저 받고 getString("key값","기본값")를 하면 기본값 세팅이 가능해 짐

Bundle extras = getIntent().getExtras();
String phase = extras.getString("phase","enroll");

이렇게 사용도 가능

Bundle extras = getIntent().getExtras();
      if (extras != null) {
         String phase = extras.getString("phase","enroll");
         if (phase.equals("verify")){
            //new Handler().postDelayed(Match(),1000);
            new Handler().postDelayed(new Runnable() {
               @Override
               public void run() {
                  Match();
               }
            },1000);
         }
      }