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Asked: 2026-06-10T03:30:48+00:00

Currently i applied a DatePicker into my application and when i click the Button

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Currently i applied a DatePicker into my application and when i click the Button, it crashed. Below is the logcat:

08-18 00:22:39.564: E/AndroidRuntime(793): FATAL EXCEPTION: main
08-18 00:22:39.564: E/AndroidRuntime(793): java.lang.RuntimeException: Unable to start activity  ComponentInfo{com.stts.sparetimetradingsystem/com.stts.sparetimetradingsystem.employer.EditEventActivity}:  java.lang.NullPointerException
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.os.Looper.loop(Looper.java:123)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-18 00:22:39.564: E/AndroidRuntime(793):  at java.lang.reflect.Method.invokeNative(Native Method)
08-18 00:22:39.564: E/AndroidRuntime(793):  at java.lang.reflect.Method.invoke(Method.java:521)
08-18 00:22:39.564: E/AndroidRuntime(793):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-18 00:22:39.564: E/AndroidRuntime(793):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-18 00:22:39.564: E/AndroidRuntime(793):  at dalvik.system.NativeStart.main(Native Method)
08-18 00:22:39.564: E/AndroidRuntime(793): Caused by: java.lang.NullPointerException
08-18 00:22:39.564: E/AndroidRuntime(793):  at com.stts.sparetimetradingsystem.employer.EditEventActivity.updateDisplayFrom(EditEventActivity.java:532)
08-18 00:22:39.564: E/AndroidRuntime(793):  at com.stts.sparetimetradingsystem.employer.EditEventActivity.onCreate(EditEventActivity.java:236)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-18 00:22:39.564: E/AndroidRuntime(793):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-18 00:22:39.564: E/AndroidRuntime(793):  ... 11 more

Sorry for not placing my code. Here is my code:

private int mYear;
private int mMonth;
private int mDay;
static final int DATE_DIALOG_ID = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.edit_event);

    edit_eventSpinner = (Spinner) findViewById(R.id.edit_spinner);
    btnSaveEvent = (Button) findViewById(R.id.btnSaveEvent);
    btnDeleteEvent = (Button) findViewById(R.id.btnDeleteEvent);
    edit_error = (TextView) findViewById(R.id.edit_error);

    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
            this, R.array.salary_array,
            android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    edit_eventSpinner.setAdapter(adapter);
    edit_eventSpinner
            .setOnItemSelectedListener(new OnItemSelectedListener() {
                public void onItemSelected(AdapterView<?> parent,
                        View view, int position, long id) {

                    if (position == 0) {
                        rate = "/hour";
                    } else if (position == 1) {
                        rate = "/day";
                    } else {
                        rate = "/month";
                    }
                }

                public void onNothingSelected(AdapterView<?> parent) {

                }
            });

    // getting event details from intent
    Intent i = getIntent();

    // getting event id (EID) from intent
    eid = i.getStringExtra(TAG_EID);

    // Getting complete event details in background thread
    new GetEventDetails().execute();

    // save button click event
    btnSaveEvent.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {
            // starting background task to update event
            String e = edit_eventName.getText().toString();
            String c = edit_eventCName.getText().toString();
            String s = edit_eventSalary.getText().toString();
            String f = edit_eventFrom.getText().toString();
            String t = edit_eventTo.getText().toString();
            String whf = edit_eventWHFrom.getText().toString();
            String wht = edit_eventWHTo.getText().toString();
    });

    // Delete button click event
    btnDeleteEvent.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {
            // deleting event in background thread
            new DeleteEvent().execute();
        }
    });

    Button edit_pickDateFrom = (Button) findViewById(R.id.edit_pickDateFrom);

    edit_pickDateFrom.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            showDialog(DATE_DIALOG_ID);
        }
    });

    updateDisplayFrom();
}

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {

    case DATE_DIALOG_ID:
        return new DatePickerDialog(this, mDateSetListenerFrom, mYear,
                mMonth, mDay);
    }
    return null;
}

protected void onPrepareDialog(int id, Dialog dialog) {
    switch (id) {

    case DATE_DIALOG_ID:
        ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);
        break;
    }

}

// SET THE DATE FORMAT ALREADY USER SELECT FROM THE DATEPICKER
private void updateDisplayFrom() {
    edit_eventFrom.setText(new StringBuilder()
            // Month is 0 based so add 1
            .append(mDay).append("-").append(mMonth + 1).append("-")
            .append(mYear).append(""));
}

private DatePickerDialog.OnDateSetListener mDateSetListenerFrom = new DatePickerDialog.OnDateSetListener() {

    public void onDateSet(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {
        mYear = year;
        mMonth = monthOfYear;
        mDay = dayOfMonth;
        updateDisplayFrom();
    }
};

Below is the new error that i get after even though i initialized the edit_eventName etc.

08-18 01:09:56.764: E/AndroidRuntime(977): FATAL EXCEPTION: main
08-18 01:09:56.764: E/AndroidRuntime(977): java.lang.IllegalArgumentException: current should be >= start and <= end
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.widget.NumberPicker.setCurrent(NumberPicker.java:288)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.widget.DatePicker.updateDaySpinner(DatePicker.java:364)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.widget.DatePicker.updateSpinners(DatePicker.java:350)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.widget.DatePicker.init(DatePicker.java:346)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.DatePickerDialog.<init>(DatePickerDialog.java:124)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.DatePickerDialog.<init>(DatePickerDialog.java:83)
08-18 01:09:56.764: E/AndroidRuntime(977):  at com.stts.sparetimetradingsystem.employer.EditEventActivity.onCreateDialog(EditEventActivity.java:527)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.Activity.onCreateDialog(Activity.java:2472)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.Activity.createDialog(Activity.java:881)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.Activity.showDialog(Activity.java:2547)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.Activity.showDialog(Activity.java:2514)
08-18 01:09:56.764: E/AndroidRuntime(977):  at com.stts.sparetimetradingsystem.employer.EditEventActivity$5.onClick(EditEventActivity.java:245)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.view.View.performClick(View.java:2408)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.view.View$PerformClick.run(View.java:8816)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.os.Handler.handleCallback(Handler.java:587)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.os.Handler.dispatchMessage(Handler.java:92)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.os.Looper.loop(Looper.java:123)
08-18 01:09:56.764: E/AndroidRuntime(977):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-18 01:09:56.764: E/AndroidRuntime(977):  at java.lang.reflect.Method.invokeNative(Native Method)
08-18 01:09:56.764: E/AndroidRuntime(977):  at java.lang.reflect.Method.invoke(Method.java:521)
08-18 01:09:56.764: E/AndroidRuntime(977):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-18 01:09:56.764: E/AndroidRuntime(977):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-18 01:09:56.764: E/AndroidRuntime(977):  at dalvik.system.NativeStart.main(Native Method)
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1 Answer

  1. Editorial Team

    It seems as though you have not initialized edit_eventFrom anywhere in the code you posted.

    You will need to inflate that View from your layout, like you did your other Views:

    edit_eventSpinner = (Spinner) findViewById(R.id.edit_spinner);
btnSaveEvent = (Button) findViewById(R.id.btnSaveEvent);
btnDeleteEvent = (Button) findViewById(R.id.btnDeleteEvent);
edit_error = (TextView) findViewById(R.id.edit_error);

    And as swayam mentioned, you will need to do this for any View you are wanting to use in your code.

    swayam

    Similarly, initialize all the following EditText views before using in your code

    Second Error

    IllegalArgumentException: current should be >= start and <= end

    You need to initialize mYear, mDay and mMonth to some default or whatever value you want.

    Reference for this solution.

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