nullpointerexception

问题 I keep getting a Run Time error that says I am having an Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException it is saying a [line 65] but to me it just looks like a basic if statement. I can give some background. this frame is call from a sequence of frames that is then once the state is selected sent to a new frame that contains states A-C cities. This current frame will work only when Alabama is not the state selected. (I have not created the other frames for the other

问题 I created a Tab Layout with Swipeable Views using this tutorial. I'm trying to pass a string from Activity to Fragment. I read about fragment communication and couple other topics on stackoverflow but still i get null pointer exception. Here's my code: MainActivity.java public class MainActivity extends FragmentActivity { private static final int REQUEST_CODE_EMAIL = 1; String password, email; ViewPager viewPager; TabsPagerAdapter tabsPagerAdapter; ActionBar actionBar; @Override protected

问题 I've been working on this for hours now. Can't find any reason. I can't post the entire fragment here but the following should make it clear. @BindView(R.id.acService) AutoCompleteTextView autocompleteService; @BindView(R.id.acAddress) AutoCompleteTextView autocompleteAddress; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_home, container, false); unbinder = ButterKnife.bind(this,

问题 I am following the Android developer tutorials on camera here: https://developer.android.com/training/camera/photobasics#java I however get an error in the method onActivityResult:,java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference This line is giving the error: Bitmap imageBitmap = (Bitmap) extras.get("data"); Somehow when I comment out this line then the app works: takePictureIntent.putExtra

问题 i m gettin a NullPointerException in my EhActivity class while opening a database public class EHActivity extends Activity { ArrayList<String>ques= new ArrayList<String>(); ArrayList<String>ans=new ArrayList<String>(); SQLiteDatabase db2; public ArrayList<String> getQues() { db2=openOrCreateDatabase("interview.db", MODE_PRIVATE, null); db2.execSQL("create table eh (qid int primary key,ques varchar,ans char)"); db2.execSQL("insert into subject values(1,'What is an exception?','A1 '))"); db2

问题 I have a filter to save requests to DB. But I get NullPointerException on autowired field: inboundRequestLogStore. I've tried the suggestion from Using some beans in Filter bean class? (I've added SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this, filterConfig.getServletContext()); to the filter init method and defined a bean in my root-context.xml ) and now it works for the RequestLogFilter class. But, in the InboundRequestLogStore class I have another autowired filed

问题 I am getting some good handson on my Java ans Selenium. When I use the same "Input_Search_Box" Webelement to perform click method it throws a nullpointer exception. I have googled and tried few work around like adding Thread, adding Explicit wait but still no clue where i miss. Any suggestion would be greatly appreciated. Here is my Code: public class Testclass { WebElement Input_Search_Box; WebDriver driver; @Test public void openBrowser() throws Exception{ System.setProperty("webdriver

问题 As the question dictates, i need to display records from database, different record for each child.ie, child 1= record 1 data. child 2 =record 2 data.so and so. i came up with the following code for display: package com.example.moolah; import android.app.ListActivity; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.support.v4.widget.SimpleCursorAdapter; import android.view.View; import android.widget.Button; public class DisplayActivity

问题 I'm getting a NullPointerException while trying to start an Activity which contains a ListView . In the getView method of the adapter class, the exception happens when the setText function of a textView is being called . The code bellow is my adapter class: public class QuestionsListAdapter extends ArrayAdapter<Question> { Context context; List<Question> questions; public QuestionsListAdapter(Context context, List<Question> questions){ super(context, R.layout.list_item_question, questions);

问题 I'm looking now a few days for a solution for clickable items in a listView. First I came across this: developer.android.com/resources/articles/touch-mode.html and found that it's doesn't have the "normal" onListItemClick() behavouir. Then I came across of this code : http://www.androidsnippets.org/snippets/125/ // LINE 296-321 @Override protected ViewHolder createHolder(View v) { // createHolder will be called only as long, as the ListView is not filled // entirely. That is, where we gain