empt zum Aufruf der virtuellen Methode 'void android.widget.button.setonclicklistener

Question

Hallo, ich bin ein Novize zu Android Studio, aber ich kann nicht scheinen, diesen Fehler zu lösen. Habt ihr etwas dagegen?

Process: com.sp.ez_mart_xy, PID: 24157 
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference at com.sp.ez_mart_xy.OneFragment.onCreateView(OneFragment.java:39) 

-Code

@Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
      View view = inflater.inflate(R.layout.fragment_two, container, false); 
      super.onCreate(savedInstanceState); 
      scan_btn = (Button) view.findViewById(scan_button); 
      final Activity activity = getActivity(); 
      scan_btn.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        IntentIntegrator integrator = new IntentIntegrator(activity); 
        integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES); 
        integrator.setPrompt("Scan"); 
        integrator.setCameraId(0); 
        integrator.setBeepEnabled(false); 
        integrator.setBarcodeImageEnabled(false); 
        integrator.initiateScan(); 
       } 
      }); 
      return view 

Das Problem scheint die

scan_btn = button 

ich ändern es im Hinblick auf GetView und Wurzel versucht, aber es immer noch nicht. I versuchte auch Lösungen aus stackoverflow aber stürzt trotzdem ab. Hier ist die XML-Datei:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:weightSum="1" 
    android:orientation="vertical" 
    android:background="@color/zxing_custom_possible_result_points"> 

    <LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="24dp"></LinearLayout> 

    <TextView 
     android:text="Current Location :" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView" 
     android:textAppearance="@style/TextAppearance.AppCompat.Body1" 
     android:fontFamily="cursive" 
     android:textSize="30sp" 
     android:textAlignment="viewStart" 
     android:typeface="serif" 
     android:textStyle="normal|bold" 
     android:textAllCaps="false" /> 

    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:inputType="textPersonName" 
     android:ems="10" 
     android:id="@+id/Edit_current" 
     android:selectAllOnFocus="true" 
     tools:backgroundTint="@color/common_action_bar_splitter" 
     android:background="@color/common_action_bar_splitter" 
     android:layout_weight="0.21" 
     android:hint="Scan/Type Location" 
     android:textStyle="normal|italic" 
     tools:background="@color/zxing_possible_result_points" /> 

    <LinearLayout 
     android:orientation="horizontal" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_weight="0.14"></LinearLayout> 

    <LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="115dp"> 

     <Button 
      android:text="Scan Nearest Qr Code" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:id="@+id/scan_btn" 
      android:background="@color/zxing_possible_result_points" 
      android:elevation="0dp" 
      android:typeface="monospace" 
      android:textSize="18sp" 
      android:visibility="visible" /> 

    </LinearLayout> 

    <LinearLayout 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="224dp" 
     android:elevation="1dp" 
     android:weightSum="1"> 

     <LinearLayout 
      android:orientation="vertical" 
      android:layout_width="match_parent" 
      android:layout_height="35dp"></LinearLayout> 

     <TextView 
      android:text="Destination :" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:id="@+id/Destination" 
      android:textAppearance="@style/TextAppearance.AppCompat.Body1" 
      android:fontFamily="cursive" 
      android:textSize="30sp" 
      android:textStyle="normal|bold" /> 

     <EditText 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:inputType="textPersonName" 
      android:ems="10" 
      android:id="@+id/edit_destination" 
      android:hint="Example:Fish" 
      android:singleLine="true" 
      android:backgroundTint="@color/common_action_bar_splitter" 
      android:background="@color/zxing_possible_result_points" 
      android:layout_weight="0.25" 
      style="@style/Widget.AppCompat.AutoCompleteTextView" 
      android:selectAllOnFocus="false" 
      android:textStyle="normal|italic" 
      android:textAllCaps="false" /> 

    </LinearLayout> 

</LinearLayout> 

Answer 1

sein sollte

scan_btn = (Button) view.findViewById(R.id.scan_button); 

statt scan_btn = (Button) view.findViewById(scan_button);

und entfernen Sie diese Zeile super.onCreate(savedInstanceState);. Ich glaube nicht, dass es nötig ist.