StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PONullPointerException android
primarykey
Id
19839974
data
AcceptedAnswerId
0
AnswerCount
2
ClosedDate
CommentCount
9
CommunityOwnedDate
CreationDate
2013-11-07T15:35:36.610
FavoriteCount
0
LastActivityDate
2013-11-07T15:41:30.317
LastEditDate
LastEditorUserId
0
OwnerUserId
2948332
ParentId
0
PostTypeId
1
Score
0
ViewCount
81
LastEditorDisplayName
text
Body
I am writing this android code for currency converting, I am getting NullPointerException : this is the code, my logCat says that the error is at line 73 <pre><code>public class Currency_convert extends Activity { public int to; public int from; public String [] val; public String s; public Handler handler; public double am=0.0; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Spinner s1 = (Spinner) findViewById(R.id.spinner11); Spinner s2 = (Spinner) findViewById(R.id.spinner22); final EditText e=(EditText) findViewById(R.id.amountt); // am=Double.parseDouble(e.getText().toString()); ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource( this, R.array.name, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.select_dialog_singlechoice); val = getResources().getStringArray(R.array.value); s1.setAdapter(adapter); s2.setAdapter(adapter); s1.setOnItemSelectedListener(new spinOne(1)); s2.setOnItemSelectedListener(new spinOne(2)); Button b = (Button) findViewById(R.id.button11); b.setOnClickListener(new OnClickListener(){ public void onClick(View v) { TextView t = (TextView) findViewById(R.id.textView44); if(from == to) { Toast.makeText(getApplicationContext(), "Invalid", 4000).show(); } else { try { s = getJson("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22"+val[from]+val[to]+"%22)&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback="); //s=getJson("http://www.google.com/ig/calculator?hl=en&q=1USD=?INR"); JSONObject jObj; jObj = new JSONObject(s); String exResult = jObj.getJSONObject("query").getJSONObject("results").getJSONObject("rate").getString("Rate"); am=Double.parseDouble(e.getText().toString()); double totalR=(Double.parseDouble(exResult))*am; String r=String.valueOf(totalR); t.setText(r); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }); } public String getJson(String url)throws ClientProtocolException, IOException { StringBuilder build = new StringBuilder(); HttpClient client = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(url); HttpResponse response = client.execute(httpGet); HttpEntity entity = response.getEntity(); InputStream content = entity.getContent(); BufferedReader reader = new BufferedReader(new InputStreamReader(content)); String con; while ((con = reader.readLine()) != null) { build.append(con); } return build.toString(); } private class spinOne implements OnItemSelectedListener { int ide; spinOne(int i) { ide =i; } public void onItemSelected(AdapterView<?> parent, View view, int index, long id) { if(ide == 1) from = index; else if(ide == 2) to = index; } public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } } } </code></pre> the error is run time error at this line : <pre><code> s2.setAdapter(adapter); </code></pre> I don't know what is wrong!! here is the logcat: <pre><code>11-07 10:25:22.194: E/AndroidRuntime(2004): FATAL EXCEPTION: main 11-07 10:25:22.194: E/AndroidRuntime(2004): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dashboard_our/com.example.dashboard_our.Currency_convert}: java.lang.NullPointerException 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.ActivityThread.access$600(ActivityThread.java:141) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.os.Handler.dispatchMessage(Handler.java:99) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.os.Looper.loop(Looper.java:137) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.ActivityThread.main(ActivityThread.java:5103) 11-07 10:25:22.194: E/AndroidRuntime(2004): at java.lang.reflect.Method.invokeNative(Native Method) 11-07 10:25:22.194: E/AndroidRuntime(2004): at java.lang.reflect.Method.invoke(Method.java:525) 11-07 10:25:22.194: E/AndroidRuntime(2004): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 11-07 10:25:22.194: E/AndroidRuntime(2004): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-07 10:25:22.194: E/AndroidRuntime(2004): at dalvik.system.NativeStart.main(Native Method) 11-07 10:25:22.194: E/AndroidRuntime(2004): Caused by: java.lang.NullPointerException 11-07 10:25:22.194: E/AndroidRuntime(2004): at com.example.dashboard_our.Currency_convert.onCreate(Currency_convert.java:73) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.Activity.performCreate(Activity.java:5133) 11-07 10:25:22.194: E/AndroidRuntime(2004): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) </code></pre>
Tags
<android>
Title
NullPointerException android
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USruaa.brkat
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.