Android Spinner NullPointException

Question

I find an error when I create a counter. It seems that the counter is Null, but I'm not sure where the problem is. I created an array of strings in the strings.xml file. Are there any things that I missed?

the code:

public class NewWorkOrder extends ActionBarActivity { private Spinner spinner; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_new_work_order); this.spinner = (Spinner) findViewById(R.id.workTypeSpinner); // Create an ArrayAdapter using the string array and a default spinner layout ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.array.work_type, android.R.layout.simple_spinner_item); // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // Apply the adapter to the spinner spinner.setAdapter(adapter); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()).commit(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.new_work_order, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_new_work_order, container, false); return rootView; } } } 

Logcat

 06-11 03:02:30.174: E/AndroidRuntime(1389): FATAL EXCEPTION: main 06-11 03:02:30.174: E/AndroidRuntime(1389): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cosmic.workorder/com.cosmic.workorder.NewWorkOrder}: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.cosmic.workorder:id/container) for fragment PlaceholderFragment{41735b50 #0 id=0x7f05003c} 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.access$600(ActivityThread.java:141) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.os.Handler.dispatchMessage(Handler.java:99) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.os.Looper.loop(Looper.java:137) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.main(ActivityThread.java:5103) 06-11 03:02:30.174: E/AndroidRuntime(1389): at java.lang.reflect.Method.invokeNative(Native Method) 06-11 03:02:30.174: E/AndroidRuntime(1389): at java.lang.reflect.Method.invoke(Method.java:525) 06-11 03:02:30.174: E/AndroidRuntime(1389): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 06-11 03:02:30.174: E/AndroidRuntime(1389): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 06-11 03:02:30.174: E/AndroidRuntime(1389): at dalvik.system.NativeStart.main(Native Method) 06-11 03:02:30.174: E/AndroidRuntime(1389): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.cosmic.workorder:id/container) for fragment PlaceholderFragment{41735b50 #0 id=0x7f05003c} 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:930) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.Activity.performStart(Activity.java:5143) 06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184) 06-11 03:02:30.174: E/AndroidRuntime(1389): ... 11 more 

Answer 1

Use this: (I tested it)

 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,array); // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // Apply the adapter to the spinner spinner.setAdapter(adapter); 

Answer 2

Change

 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.array.work_type, android.R.layout.simple_spinner_item); 

to

 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, R.array.work_type); 

The adapter takes the array as the last parameter, but you pass it as the second parameter. Pass it as the third parameter. He should work

Answer 3

Your spinner is probably inside the fragment layout, not the activity ... So put your work inside onCreateView as follows:

 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_new_work_order, container, false); Spinner spinner = (Spinner) rootView.findViewById(R.id.workTypeSpinner); // Create an ArrayAdapter using the string array and a default spinner layout ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, R.array.work_type); // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // Apply the adapter to the spinner spinner.setAdapter(adapter); return rootView; }