Hi in my application I'm trying to create the NumberPicker its not working its giving error like.
06-12 13:07:33.938: E/AndroidRuntime(7521): FATAL EXCEPTION: main
06-12 13:07:33.938: E/AndroidRuntime(7521): Process: com.politicalmileage.elangovan, PID: 7521
06-12 13:07:33.938: E/AndroidRuntime(7521): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.politicalmileage.elangovan/com.politicalmileage.elangovan.Schedule}: java.lang.NullPointerException
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.os.Handler.dispatchMessage(Handler.java:102)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.os.Looper.loop(Looper.java:136)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-12 13:07:33.938: E/AndroidRuntime(7521): at java.lang.reflect.Method.invokeNative(Native Method)
06-12 13:07:33.938: E/AndroidRuntime(7521): at java.lang.reflect.Method.invoke(Method.java:515)
06-12 13:07:33.938: E/AndroidRuntime(7521): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-12 13:07:33.938: E/AndroidRuntime(7521): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-12 13:07:33.938: E/AndroidRuntime(7521): at dalvik.system.NativeStart.main(Native Method)
06-12 13:07:33.938: E/AndroidRuntime(7521): Caused by: java.lang.NullPointerException
06-12 13:07:33.938: E/AndroidRuntime(7521): at com.politicalmileage.elangovan.Schedule.onCreate(Schedule.java:58)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.Activity.performCreate(Activity.java:5231)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-12 13:07:33.938: E/AndroidRuntime(7521): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
06-12 13:07:33.938: E/AndroidRuntime(7521): ... 11 more
My XML code.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:textColor="#43bd00"
android:textSize="16sp"
android:textStyle="bold"
android:text="TextView" />
<TextView
android:id="@+id/cost"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/title"
android:text="TextView" />
<Button
android:id="@+id/bAdd"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/title"
android:layout_marginLeft="17dp"
android:layout_toRightOf="@+id/title"
android:text="+" />
<Button
android:id="@+id/bSub"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/bAdd"
android:layout_toRightOf="@+id/tvDisplay"
android:text="-" />
<TextView
android:id="@+id/tvDisplay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/bSub"
android:layout_alignBottom="@+id/bSub"
android:layout_toRightOf="@+id/bAdd"
android:text="1" />
My java code.
public class Schedule extends ListActivity {
private ProgressDialog pDialog;
int counter = 1;
Button add,sub;
TextView display;
// URL to get contacts JSON
private static String url = "myurl";
// JSON Node names
private static final String TAG_SCHEDULES = "schedule";
private static final String TAG_ID = "id";
private static final String TAG_TITLE = "title";
/*private static final String TAG_CONTENT = "content";*/
private static final String TAG_COST = "cost";
/*private static final String TAG_DATETIME = "date_time";*/
// contacts JSONArray
JSONArray schedules = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> schedule_list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.schedule_list_view);
add = (Button) findViewById(R.id.bAdd);
sub = (Button) findViewById(R.id.bSub);
display = (TextView) findViewById(R.id.tvDisplay);
add.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
counter++;
display.setText( "" + counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
counter--;
display.setText( "" + counter);
}
});
schedule_list = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String title = ((TextView) view.findViewById(R.id.title)).getText().toString();
/*String content = ((TextView) view.findViewById(R.id.content)).getText().toString();*/
String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
/*String datetime = ((TextView) view.findViewById(R.id.datetime)).getText().toString();*/
// Starting single contact activity
Intent in = new Intent(getApplicationContext(), ScheduleDetail.class);
in.putExtra(TAG_TITLE, title);
in.putExtra(TAG_COST, cost);
/*in.putExtra(TAG_CONTENT, content);
in.putExtra(TAG_DATETIME, datetime);*/
startActivity(in);
}
});
// Calling async task to get json
new GetSchedule().execute();
}
/**
* Async task class to get json by making HTTP call
* */
private class GetSchedule extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(Schedule.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
schedules = jsonObj.getJSONArray(TAG_SCHEDULES);
// looping through All Schdules
for (int i = 0; i < schedules.length(); i++) {
JSONObject c = schedules.getJSONObject(i);
String id = c.getString(TAG_ID);
String title = c.getString(TAG_TITLE);
/*String content = c.getString(TAG_CONTENT);*/
String cost = c.getString(TAG_COST);
/*String datetime = c.getString(TAG_DATETIME);*/
// Phone node is JSON Object
// tmp hashmap for Schedule
HashMap<String, String> schedule_file = new HashMap<String, String>();
// adding each child node to HashMap key => value
schedule_file.put(TAG_ID, id);
schedule_file.put(TAG_TITLE, title);
/*schedule_file.put(TAG_CONTENT, content);*/
schedule_file.put(TAG_COST, cost);
/*schedule_file.put(TAG_DATETIME, datetime);*/
// adding schedule list
schedule_list.add(schedule_file);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Schedule.this, schedule_list,
R.layout.schedule_list_item,
new String[] { TAG_TITLE, TAG_COST },
new int[] { R.id.title,R.id.cost });
setListAdapter(adapter);
}
}
}
I'm trying to create minimum maximum number with some text form my server its not working its showing the null pointer exception error please tell in the above code where i have done wrong how to resolve this issue.
Thanks.
