I am trying to get an arraylist in ScanLocate
activity from an UpdateLocation
activity.
I'm using startActivityForResult
method to call the scan
method which populates the ArrayList wifiList
, I then want to send the ArrayList to the Update Location
class.
I start by calling startActivityForResult
in Update Location
:
private void getScan(){
//Create an intent to start ScanLocate
final Intent i = new Intent(this, ScanLocate.class);
//Start scanLocate with request code
startActivityForResult(i, REQUEST_READINGS);
}
Next, in ScanLocate
I created the sendData
method (note: the check confirms that the ArrayList data is intact at that point):
private void sendData(){
//create a new intent as container for the result
final Intent readings = new Intent(this, UpdateLocation.class);
//check that data is in wifiList
for(String s:wifiList){
Log.v(TAG,"List Items: " + s);
}
//create bundle for string array
Bundle b = new Bundle();
b.putStringArrayList(key, wifiList);
//add readings to send to updateLoc
readings.putExtras(b);
//set code to indicate success and attach Intent
setResult(RESULT_OK, readings);
//call finish to return
finish();
}
The final part is back in UpdateLocation
with the onActivityResult
:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent readings){
super.onActivityResult(requestCode, resultCode, readings);
//check if request code matches the one set above
if(requestCode == REQUEST_READINGS){
//check if sendData() in ScanLocate was successful
if(resultCode == RESULT_OK){
//get the readings from the Intent
Log.v(TAG, "HERE");
result = getIntent().getExtras().getStringArrayList(ScanLocate.key);
Log.v(TAG, "HERE2");
for(String s : result) {
Log.v(TAG, "Location 5: " + s);
}
}else{
//ScanLocate was unsuccessful
}
}
}
The first "Here"
is displayed however it then falls down on the next line, getStringArrayList()
throws a null pointer exception.
I have looked through the documentation and at previous questions on here and I cannot see what is going wrong.
Any advice would be appreciated, thanks.
Previous questions:
startactivityforResult not working
How to pass an ArrayList to the StartActivityForResult activity
You don't need to call getIntent()
, use the parameter provided by the method:
result = readings.getStringArrayListExtra(ScanLocate.key);
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