Hi,
I'm trying to make a simple menu for adding another contact to a list.
On the ListView I have a button on a footer which uses
startActivityForResult to create a new menu (called add_dialog). This
is a simple EditText with an OK button and a Cancel button. The idea
is that clicking the OK button will pass the string from the EditText
back to the main Activity.
When the add_dialog Activity finishes and onActivityResult tries to
read the string extra it throws a null pointer exception.
The debugger gives the following line:
E/AndroidRuntime( 410): java.lang.RuntimeException: Failure
delivering result ResultInfo{who=null, request=0, result=-1,
data=null} to activity {com.test.hello_listview/
com.test.hello_listview.hello_listview}:
java.lang.NullPointerException
Can someone please explain why data is always null? Am I not using
getIntent().putExtra() correctly?
The source for the main Activity is:
public class hello_listview extends Activity
{
private Log logger;
private static final String TAG = "hello_listview";
private String[] Pals;
private ArrayAdapter<String> adapter;
private Button addButton;
private String palName = "";
private static final int ADD_DIALOG = 0;
private static final int MAP_VIEW = 1;
Intent intent_addPal;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.palslist);
Pals = getResources().getStringArray(R.array.pals);
Arrays.sort(Pals);
ListView list = (ListView) findViewById(R.id.list);
adapter = new ArrayAdapter<String>(this, R.layout.listitem);
for (int i = 0; i < Pals.length; i++) {
adapter.add(Pals[i]);
}
list.setAdapter(adapter);
addButton = (Button) findViewById(R.id.addButton);
addButton.setOnClickListener(addButton_clicked);
intent_addPal = new Intent(this,
com.test.hello_listview.add_dialog.class);
}
OnClickListener addButton_clicked = new OnClickListener() {
@Override
public void onClick(View v) {
logger.i(TAG, "add clicked");
startActivityForResult(intent_addPal, ADD_DIALOG);
}
};
@Override
public void onActivityResult(int requestCode, int resultCode,
Intent data) {
if ((resultCode == Activity.RESULT_OK) && (requestCode ==
ADD_DIALOG)) {
logger.i(TAG, "add okay. data = " +
data.getStringExtra("PALNAME")); // THIS LINE HERE
}
}
} // End of hello_mapview class
The source for the add_dialog Activity is:
public class add_dialog extends Activity {
EditText addText;
Button cancelButton;
Button doneButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_dialog);
addText = (EditText) findViewById(R.id.addText);
cancelButton = (Button) findViewById(R.id.cancelButton);
doneButton = (Button) findViewById(R.id.doneButton);
cancelButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setResult(RESULT_CANCELED);
finish();
}
});
doneButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getIntent().putExtra("CONTACTNAME",
addText.getText()); // ALSO THIS
LINE HERE
setResult(RESULT_OK);
finish();
}
});
} // End of onCreate
} // End of add_dialog class
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