Intent.createChooser android二维码阅读器

Question

I want the user to choose a QR reader from his installed apps. This could be done by using the Intent.createChooser. When a picture is taken with the QR reader, the QR code should be sent back to my application. This is what Ive tried so far:

        Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setType("text/plain");
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
            intent.putExtra("SCAN_MODE", "QR_CODE_MODE");

            String title = (String) getResources().getText(R.string.chooser_title);

            Intent chooser = Intent.createChooser(intent, title);

            startActivityForResult(chooser, CUSTOM_REQUEST_QR_SCANNER);

The scanner doens't start correctly, it only shows an sample QR code. I have a feeling the intent.setType("text/plain") might be wrong? What type is a QR reader? Or how do i start a QR reader this way correctly?

I also have an ActivityResult when the QR app is done:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == CUSTOM_REQUEST_QR_SCANNER) {

        Log.d(TAG, "QR activity complete");
                        //Successful scan
                        if (resultCode == RESULT_OK) {

Answer 1

Replace

intent.setType("text/plain");

with

intent.setType("com.google.zxing.client.android.SCAN");

Answer 2

Follow This Demo and do include " android-integration.jar " in your project it has this .jar file also... and also you can download Zxing Library from Here it will use the available QR Code Scanner in your app. There are also other ways just use this first you will get to know other also by R and D.

OR

Use this:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);



        Button btn_scan =(Button) findViewById(R.id.btn_scan);
        btn_scan.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                 IntentIntegrator integrator = new IntentIntegrator(MainActivity.this);
                  integrator.initiateScan(IntentIntegrator.QR_CODE_TYPES);

            }
        });
    }

    @Override
      public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        if (result != null) {
          String contents = result.getContents();
          if (contents != null) {
            showDialog("Found QRcode", result.toString());
          } else {
            showDialog("NO QRcode Found", "The user gave up and pressed Back");
          }
        }
    }

    private void showDialog(String title, CharSequence message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton("OK", null);
        builder.show();
      }

and include same .jar file in project properties java build path. you can download .jar from here same link.