Question

I have been having trouble with setting an initial input on my EditTexts. Whenever I pass an intent containing a string from previous activity, it leads to a forced close.

The main gist of my program is that, a previous activity sends an intent containing a string to the editText activity. If it’s not initialized, editTexts are blank, else, they contain the values shown in the TextView from the previous screen. Here is my code:

EditText month, day, year;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.lab2_082588birthday);

    Intent startUp = getIntent();
    String receivedString = startUp.getStringExtra(Lab2_082588part2.BIRTHDAY_STRING);

    if(receivedString.trim().length() > 0){
        String[] separated = receivedString.split("/");

        int stringMonth = Integer.parseInt(separated[0]);
        int stringDay = Integer.parseInt(separated[1]);
        int stringYear = Integer.parseInt(separated[2]);

        month.setText(stringMonth);
        day.setText(stringDay);
        year.setText(stringDay);

    }
}

Here is my LogCat

07-06 15:05:19.918: E/AndroidRuntime(276): Caused by: java.lang.NullPointerException

07-06 15:05:19.918: E/AndroidRuntime(276):  at com.android.rondrich.Lab2_082588birthday.onCreate(Lab2_082588birthday.java:34)

07-06 15:05:19.918: E/AndroidRuntime(276):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

07-06 15:05:19.918: E/AndroidRuntime(276):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

Answer 1

First initialize textView’s after
setContentView(R.layout.lab2_082588birthday); as:

month = (TextView)findViewById(R.id.month);
 day = (TextView)findViewById(R.id.day);
 month = (TextView)findViewById(R.id.year);

and then Set Integer Value to TextView as:

month.setText(stringMonth+"");
day.setText(stringDay+"");
year.setText(stringDay+"");

or

month.setText(String.valueOf(stringMonth));
day.setText(String.valueOf(stringDay));
year.setText(String.valueOf(stringDay));

as after provide logcat:
check array lenth before paring String to int
:

if(separated.length >0)
{
        int stringMonth = Integer.parseInt(separated[0]);
        int stringDay = Integer.parseInt(separated[1]);
        int stringYear = Integer.parseInt(separated[2]);

        month.setText(stringMonth+"");
        day.setText(stringDay+"");
        year.setText(stringDay+"");
}