Spinner using ArrayAdapter, crash the app - crash

Question

I'm trying to make a spinner with an ArrayAdapter but the application crash, i didn't find the solution on other post so i hope you can help me :).
My string array in res/values/strings.xml
<string-array name="functionF">
<item>Lucas</item>
<item>Paul</item>
</string-array>
My spinner_layout in res/layout/spinner_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" >
<Spinner
android:id="#+id/function_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
My code
private Spinner spinnerFunction;
spinnerFunction = (Spinner) findViewById(R.id.function_spinner);
ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(this,R.array.functionF, R.layout.spinner_layout);
adapter1.setDropDownViewResource(R.layout.spinner_layout);
spinnerFunction.setAdapter(adapter1);
And here is crash error:
07-21 05:58:55.296: E/AndroidRuntime(2544): FATAL EXCEPTION: main
07-21 05:58:55.296: E/AndroidRuntime(2544): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ben.wizzer/com.ben.wizzer.Friends}: java.lang.NullPointerException
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.os.Handler.dispatchMessage(Handler.java:99)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.os.Looper.loop(Looper.java:137)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.ActivityThread.main(ActivityThread.java:5103)
07-21 05:58:55.296: E/AndroidRuntime(2544): at java.lang.reflect.Method.invokeNative(Native Method)
07-21 05:58:55.296: E/AndroidRuntime(2544): at java.lang.reflect.Method.invoke(Method.java:525)
07-21 05:58:55.296: E/AndroidRuntime(2544): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
07-21 05:58:55.296: E/AndroidRuntime(2544): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-21 05:58:55.296: E/AndroidRuntime(2544): at dalvik.system.NativeStart.main(Native Method)
07-21 05:58:55.296: E/AndroidRuntime(2544): Caused by: java.lang.NullPointerException
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.widget.ArrayAdapter.createFromResource(ArrayAdapter.java:430)
07-21 05:58:55.296: E/AndroidRuntime(2544): at com.ben.wizzer.Friends.onCreate(Friends.java:174)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.Activity.performCreate(Activity.java:5133)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-21 05:58:55.296: E/AndroidRuntime(2544): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
07-21 05:58:55.296: E/AndroidRuntime(2544): ... 11 more

Answer 1

your spinner layout should be only TextView like this:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:padding="10dp"/>
the TextView layout it's for the string array but you can use default android layou:
String [] strArr = getResources().getStringArray(R.array.functionF);
ArrayAdapter<String> adapter1 = new ArrayAdapter<Categories>(getActivity(),android.R.layout.simple_list_item_1,strArr);
spinnerFunction.setAdapter(categoriesAdapter);
if you inside a fragment, use getActivity().getResources().getStringArray(R.array.functionF);