Trying to read barcodes with Zxing, but it seems the onActivityResult is not beeing called

Question

as the title says, I'm trying to scan 1D barcodes, so far I have thet following code:

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);        
    }

    public void test(View view){

        Intent intent = new Intent("com.google.zxing.client.android.SCAN");
        intent.putExtra("SCAN_MODE", "1D_CODE_MODE");
        startActivityForResult(intent, 0);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {  
          switch (requestCode) {
          case IntentIntegrator.REQUEST_CODE:
             if (resultCode == Activity.RESULT_OK) {

                IntentResult intentResult = 
                   IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);

                if (intentResult != null) {

                   String contents = intentResult.getContents();
                   String format = intentResult.getFormatName();

                   TextView uno = (TextView) findViewById(R.id.textView1);
                   uno.setText(contents);
                   Toast.makeText(this, "Numero: " + contents, Toast.LENGTH_LONG).show();
                   Log.d("SEARCH_EAN", "OK, EAN: " + contents + ", FORMAT: " + format);
                } else {
                   Log.e("SEARCH_EAN", "IntentResult je NULL!");
                }
             } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.e("SEARCH_EAN", "CANCEL");
             }
         }
    }   
}

And of course, I have both IntentResult and IntentIntegrator added to the project.

So, the scanner is beeing called correctly when a button is pressed and it seems to scan the code perfectly (it says "Text found" after it scans it), but it seems that the onActivityResult is not called, since the TextView is not beeing updated and the Toast is not appearing.

Any idea on what the mistake could be?

Thanks in advance!

Answer 1

Your first mistake is not using IntentIntegrator.initiateScan(), replacing it with your own hand-rolled call to startActivityForResult().

Your second mistake is in assuming that IntentIntegrator.REQUEST_CODE is 0. It is not.

Hence, with your current code, you are sending out a request with request code of 0, which is coming back to onActivityResult() with request code of 0, which you are ignoring, because you are only looking for IntentIntegrator.REQUEST_CODE.

Simply replace the body of your test() method with a call to initiateScan(), and you should be in better shape. Here is a sample project that demonstrates the use of IntentIntegrator.