Integrate Zxing into Android Studio

build.grade

repositories {
    mavenCentral()

    maven {
        url "https://raw.github.com/embarkmobile/zxing-android-minimal/mvn-repo/maven-repository/"
    }
}

dependencies {
    compile 'com.google.zxing:core:2.2'
    compile 'com.embarkmobile:zxing-android-minimal:1.2.1@aar'
}

MainActivity.java

// import the various classes

// Add the controls to your View
Button button;
TextView tvScanResults;

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

  button = (Button) findViewById(R.id.button);
  tvScanResults = (TextView) findViewById(R.id.textView);
  button.setOnClickListener(this);
}

@Override
public void onClick(View v) {
  IntentIntegrator.initiateScan(this);
}

// Add the following 
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
  IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
  if (scanResult != null) {
    // handle scan result
    tvScanResults.setText(scanResult.getContents());
  } else {
    // else continue with any other code you need in the method
    Log.v("BarcodeActivity", "No result");
  }
}