MainActivity.java

package com.example.scanbarcode;

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void HandleClick(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;
        }
        try {
            startActivityForResult(intent, 0); //Barcode Scanner to scan for us
        } catch (ActivityNotFoundException e)  {
            Toast.makeText(this, "Please install the ZXing Barcode Scanner app", Toast.LENGTH_LONG).show();
        }
    }
    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.");
            }
        }
    }
}