NullPointerException - FrameLayout

Question

Я неожиданно получил ошибку исключения нулевого указателя при загрузке активности моего фрагмента. Я имел в виду FrameLayout, чтобы направлять пользователя к другому действию (при нажатии кнопки).

11-10 07:31:58.773: E/AndroidRuntime(10340): FATAL EXCEPTION: main 
    11-10 07:31:58.773: E/AndroidRuntime(10340): java.lang.NullPointerException 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at com.dooba.beta.ThirdFragment.onCreateView(ThirdFragment.java:22) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.os.Handler.handleCallback(Handler.java:615) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.os.Handler.dispatchMessage(Handler.java:92) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.os.Looper.loop(Looper.java:137) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at android.app.ActivityThread.main(ActivityThread.java:4745) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at java.lang.reflect.Method.invokeNative(Native Method) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at java.lang.reflect.Method.invoke(Method.java:511) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
    11-10 07:31:58.773: E/AndroidRuntime(10340): at dalvik.system.NativeStart.main(Native Method) 

Ниже приведен код вида деятельности:

public class ThirdFragment extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.activity_city, container, false); 

     FrameLayout icity = (FrameLayout)getView().findViewById(R.id.flCityBac); 
     icity.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       getActivity().startActivity(new Intent(getActivity(), MainActivity.class)); 
      } 
     }); 

     return rootView; 


    } 


} 

ниже код макета:

<RelativeLayout 
    android:id="@+id/layout_gridview_item" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:alpha="1" 
    android:gravity="top" 
    android:background="#DEDEDE" > 

     <RelativeLayout 
      android:id="@+id/background" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:background="@drawable/background_with_shadow" 
      android:layout_centerHorizontal="true" 
      android:layout_marginTop="20dp" 
        android:layout_below="@+id/ttitle" 

      android:padding="5dp" 
     android:alpha="0.9" 
      android:orientation="vertical" 
      > 



     <FrameLayout 
      android:id="@+id/flCityBac" 
     android:layout_width="wrap_content" 
     android:layout_height="175dp" 
     android:layout_gravity="center_horizontal" 
     android:layout_weight="30" > 

     <ImageView 
      android:id="@+id/img_cityBac" 
      android:layout_width="300dp" 
      android:layout_height="175dp" 
      android:alpha="1" 
      android:background="@drawable/vancouvero2" 
      android:contentDescription="@null" 
      android:paddingLeft="0dp" 
      android:paddingRight="4dp" 
      /> 

     <TextView 
       android:id="@+id/text_Title" 
       android:layout_width="300dp" 
       android:layout_height="40dp" 

       android:layout_gravity="bottom" 

       android:padding="0dp" 

       android:ellipsize="marquee" 
       android:gravity="center" 
              android:background="#E41B17" 
       android:alpha="0.85" 
       android:maxLines="1" 
       android:text="Vancouver, Canada" 
       android:textAllCaps="true" 
       android:textColor="#ffffff" 
       android:textSize="18sp" 
       android:textStyle="bold" 
       android:typeface="serif" /> 



       </FrameLayout> 

     </RelativeLayout> 

     <TextView 
      android:id="@+id/ttitle" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentTop="true" 
      android:layout_centerHorizontal="true" 
      android:layout_marginTop="32dp" 
      android:alpha="0.85" 
      android:ellipsize="marquee" 
      android:gravity="center" 
      android:maxLines="1" 
      android:text="Discover" 
      android:textAllCaps="true" 
      android:textColor="#E41B17" 
      android:textSize="28sp" 
      android:textStyle="bold" 
      android:typeface="serif" /> 

</RelativeLayout> 

Answer 1

Вместо

getView().findViewById(R.id.flCityBac); 

Использование:

rootView.findViewById(R.id.flCityBac); 

Вы не можете использовать getView, потому что ваш вид еще не создан.

Надеюсь, это поможет вам! :-)

Answer 2

public class ThirdFragment extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.activity_city, container, false); 

     FrameLayout icity = (FrameLayout)rootView.findViewById(R.id.flCityBac);//Use rootView here. 
     icity.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       getActivity().startActivity(new Intent(getActivity(), MainActivity.class)); 
      } 
     }); 

     return rootView; 


    } 


}