Android ClassCastException Object[] to String[]

Question

Hey fellow programmers <3
I want to transfer an String Array from my Service to my MainActivity via broadcastReceiver.
The String Array is wrapped in an Intent.
But when I try to get the String[] out of my intent
then it is an Array of Objects and I can´t just use intent.getStringArrayExtra(String).
Then I tried this:

How to convert object array to string array in Java?
String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);

But it doesen`t work either :/

public class MainActivity extends Activity implements View.OnClickListener {
final String LOG_TAG = "mainActivityLogs";
Button btnStartService;

private int numberOfFinishedTasks = 0;
private List<String> finishedTasksInTheLast60Sec = new ArrayList<>();
private int startedTasks = 0;
private ProgressBar pbService;
private Handler progressHandler = new Handler();

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        //results in java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]
        finishedTasksInTheLast60Sec = Arrays.asList(intent.getStringArrayExtra("finishedTasks"));

        //results in java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]
        Object[] objectArray = intent.getStringArrayExtra("finishedTasks");
        String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);
        finishedTasksInTheLast60Sec = Arrays.asList(stringArray);

        numberOfFinishedTasks += finishedTasksInTheLast60Sec.size();
        for (String finishedTask : finishedTasksInTheLast60Sec) {
            Log.d(LOG_TAG, finishedTask);
        }
    }
};

This function is in Service file MyService and var finishedTasks just contains name of Threads which are closed:

   private void sendBroadcast(List<String> finishedTasks) {
   Intent intent = new Intent("myServiceUpdate");
   intent.putExtra("finishedTasks", finishedTasks.toArray());
   LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
   }

I hope you can help and if you need the whole code just text me :)

Devender Verma · Accepted Answer · 2016-01-20 18:10:59Z

2

While sending, cast the List type to ArrayList type by:

intent.putStringArrayListExtra("finishedTasks",(ArrayList<String>)finishedTasks);

While receiving just get the data by :

 List stringList = getIntent().getStringArrayListExtra("finishedTasks");

answered Jan 20, 2016 at 18:10

Devender Verma

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1 Comment

T.Black Over a year ago

intent.putStringArrayListExtra("finishedTasks",(ArrayList<String>)finishedTasks); was really helpful^^ thanks a lot :)

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