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:
{studentName=XXX,studentID=SF10001}
{studentName=YYYY,studentID=SF10002}
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))
selectedItems.add(adapter.getItem(position));
}
String[] outputStrArr = new String[selectedItems.size()];
for (int i = 0; i < selectedItems.size(); i++) {
outputStrArr[i] = selectedItems.get(i);
}
Intent intent = new Intent(getApplicationContext(),
ResultActivity.class);
// Create a bundle object
Bundle b = new Bundle();
b.putStringArray("selectedItems", outputStrArr);
// Add the bundle to the intent.
intent.putExtras(b);
// start the ResultActivity
startActivity(intent);
}
And this the Result Activity.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
Bundle b = getIntent().getExtras();
String[] resultArr = b.getStringArray("selectedItems");
ListView lv = (ListView) findViewById(R.id.outputList);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, resultArr);
lv.setAdapter(adapter);
}
@SoulRayder So, I had created a StudentData Class:
public class StudentData implements Serializable {
String studentName;
String studentID;
public String getStudentNameStudentData() {
return studentName;
}
public String getStudentID()
{
return studentID;
}
And I change the code like tis:
SparseBooleanArray checked = list.getCheckedItemPositions();
ArrayList<StudentData> selectedItems = new ArrayList<StudentData>();
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))
selectedItems.add(adapter.getItem(position));
}
String[] outputStrArr = new String[selectedItems.size()];
for (int i = 0; i < selectedItems.size(); i++) {
outputStrArr[i] = selectedItems.get(i).getStudentID();
}
Intent intent = new Intent(getApplicationContext(),
ResultActivity.class);
// Create a bundle object
Bundle b = new Bundle();
b.putStringArray("selectedItems", outputStrArr);
// Add the bundle to the intent.
intent.putExtras(b);
// start the ResultActivity
startActivity(intent);
}
But this code show me error:
selectedItems.add(adapter.getItem(position));
which is ArrayList cannot applied to (java.lang.String). How to solve the problem. BTW, thanks your immediate respond :D
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))
selectedItems.add(extractStudentID(adapter.getItem(position)));
}
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
selectedItems.get(index).studentID;
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