Lai Lai - 1 year ago 86
Android Question

Extract String from ArrayList which get the item from listview

I want to extract string from the arraylist of String which is filled by the selected items from the listView.

The result of the array list is:


I want only get the studentID which are SF10001 and SF10002. Below is my code:

SparseBooleanArray checked = list.getCheckedItemPositions();
ArrayList<String> selectedItems = new ArrayList<String>();

for (int i = 0; i < checked.size(); i++) {
// Item position in adapter
int position = checked.keyAt(i);
// Add sport if it is checked i.e.) == TRUE!
if (checked.valueAt(i))

String[] outputStrArr = new String[selectedItems.size()];

for (int i = 0; i < selectedItems.size(); i++) {

outputStrArr[i] = selectedItems.get(i);


Intent intent = new Intent(getApplicationContext(),

// Create a bundle object
Bundle b = new Bundle();
b.putStringArray("selectedItems", outputStrArr);

// Add the bundle to the intent.

// start the ResultActivity

And this the Result

protected void onCreate(Bundle savedInstanceState) {
Bundle b = getIntent().getExtras();
String[] resultArr = b.getStringArray("selectedItems");

ListView lv = (ListView) findViewById(;

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, resultArr);


Answer Source

Two ways of solving your problem :

1) Simpler way , but not efficient: (You can use this if all your strings are guaranteed to use that exact template, or add further validations to the below function)

 public string extractStudentID(string input)
      string [] parts = input.substring(1,input.length-1).split(",");

      return parts[1].split("=")[1];

and use it in your code as follows

 for (int i = 0; i < checked.size(); i++) {
    // Item position in adapter
    int position = checked.keyAt(i);
    // Add sport if it is checked i.e.) == TRUE!
    if (checked.valueAt(i))

2) Create a class for you student data

class StudentData
       public string studentName;
       public string studentID;

Use an arraylist of these objects, instead of an arraylist of strings and modify your code in all other places accordingly:

 ArrayList<StudentData> selectedItems = new ArrayList<StudentData>();

Then, at any point, you can access the student ID easily by

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