CODEWITHSUNDEEP
javaandroidarrayslist
RUSKIED
RUSKIED

Reputation: 39

Adding an Arrays from strings.xml to another ArrayList

I'm trying to create an array based on a radio button survey. I have arrays for each radio button in the strings.xml. Once a radio button is selected, an array should be fetched and put in a hashset to filter out duplicates then put in a new array to display in a fragment once a submit button is clicked. The following is the main section of the activity: 

    //SUBMIT BUTTON
    Button submit = (Button) findViewById(R.id.submitBtn);
    final Fragment fragment = new ListFragment();
    final FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    //On Submit Click show Instrument Fragment
    submit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            final ArrayList filtered_list = new ArrayList<>();
            // Radio Button Selection
            if (firstrBtn.isChecked()){
                filtered_list.add(getResources().getStringArray(R.array.firstarray));

            } else if (secondrBtn.isChecked()){
                filtered_list.add(getResources().getStringArray(R.array.secondarray));
            } 

            //Convert filtered_list to final_filtered_list and eliminate duplicates
            final HashSet<String> hashSet = new HashSet<String>();
            hashSet.addAll(filtered_list);
            filtered_list.clear();
            filtered_list.addAll(hashSet);
            ArrayList<String> final_filtered_list = new ArrayList<String>(hashSet);

            //Send Final ArrayList
            Bundle bundle = new Bundle();
            bundle.putStringArrayList("RESULT_LIST", final_filtered_list);
            listFragment.setArguments(bundle);

            //Transaction to Fragment
            transaction.replace(R.id.collect_container, listFragment);
            transaction.addToBackStack(null);
            transaction.commit();
        }
    });

The arrays in strings.xml look like this:

<array name="firstarray">
    <item> One </item>
    <item> Two </item>
</array>

<array name="secondarray">
    <item> Two </item>
    <item> Three </item>
</array>

So the answer should be a list of "One", "Two", and "Three". Seems simple enough but my emulator keeps crashing and I have no idea what's wrong. Any help would be greatly appreciated.

The following is a section of a Logcat:

  019-11-17 16:59:07.354 32291- 
  32291/ E/AndroidRuntime: 
  FATAL EXCEPTION: main
  Process: PID: 32291
  java.lang.ClassCastException: java.lang.String[] cannot be cast to 
  java.lang.String
    at...

The code above points to a list adapter activity where position of each item is gathered and a picture is added next to the item in the list.

It seems that I'm mixing up my data types. I apologize for the late edit. I'm relatively new at java coding and am reading up on compatible data types.

Upvotes: 0

Views: 167

Answers (1)

noahutz
noahutz

Reputation: 1217

Modify your onclick to this:

submit.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Bundle bundle = new Bundle();
        bundle.putStringArrayList("RESULT_LIST", Arrays.asList(getResultList()));
        listFragment.setArguments(bundle);

        //Transaction to Fragment
        transaction.replace(R.id.collect_container, listFragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }
});

Add a helper method to get the appropriate list from the resource file:

private String[] getResultList() {
    if (firstrBtn.isChecked()) {
        getResources().getStringArray(R.array.firstarray));
    }
    return getResources().getStringArray(R.array.secondarray));
}

What you are doing wrong:

  1. filtered_list.add(getResources().getStringArray(R.array.firstarray)); adds String array (not String) as an item to the List.
  2. Unnecessary conversion from HashSet to ArrayList when you can directly convert from String[] (from string resource) to ArrayList.

Upvotes: 2

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