MainActivity.java

package com.example.barcodeapp;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.support.v7.app.AppCompatActivity;
import android.view.View.OnClickListener;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		HandleClick hc = new HandleClick();
		findViewById(R.id.butQR).setOnClickListener(hc);
		findViewById(R.id.butProd).setOnClickListener(hc);
		findViewById(R.id.butOther).setOnClickListener(hc);
	}

	private class HandleClick implements OnClickListener {
		public void onClick(View arg0) {
			Intent intent = new Intent("com.google.zxing.client.android.SCAN");
			switch (arg0.getId()) {
			case R.id.butQR:
				intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
				break;
			case R.id.butProd:
				intent.putExtra("SCAN_MODE", "PRODUCT_MODE");
				break;
			case R.id.butOther:
				intent.putExtra("SCAN_FORMATS", "CODE_39,CODE_93,CODE_128,DATA_MATRIX,ITF,CODABAR");
				break;
			}
			startActivityForResult(intent, 0); // Barcode Scanner to scan for us
		}
	}

	public void onActivityResult(int requestCode, int resultCode, Intent intent) {
		if (requestCode == 0) {
			TextView tvStatus = (TextView) findViewById(R.id.tvStatus);
			TextView tvResult = (TextView) findViewById(R.id.tvResult);
			if (resultCode == RESULT_OK) {
				tvStatus.setText(intent.getStringExtra("SCAN_RESULT_FORMAT"));
				tvResult.setText(intent.getStringExtra("SCAN_RESULT"));
			} else if (resultCode == RESULT_CANCELED) {
				tvStatus.setText("Press a button to start a scan.");
				tvResult.setText("Scan cancelled.");
			}
		}
	}
}