How to create your own QR Code and Barcode scanner reader Android App? - complete source code

This video shows the steps to create your own QR code (Quick response) and barcode scanner Android App in Android Studio. It uses zxing library 'com.journeyapps:zxing-android-embedded:4.0.2'.

In this video it shows how to create an IntentIntegrator object to scan the codes from your phone. The code in this video has been kept very simple to follow.

The testing of the App has been done using a real phone as camera features aren't emulated in the emulator. The screenshots of the test results and complete project source code is available on the below webpage:
programmerworld.co/android/how-to-create-your-o…

For any suggestions, comments, queries or appreciations we will be glad to hear at: [email protected]

Some of the source code is being pasted below:

package com.example.myqrcodebarcodescanner;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

public class MainActivity extends AppCompatActivity {

private TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.textView);
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, PackageManager.PERMISSION_GRANTED);
}

public void ScanButton(View view){
IntentIntegrator intentIntegrator = new IntentIntegrator(this);
intentIntegrator.initiateScan();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
IntentResult intentResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (intentResult != null){
if (intentResult.getContents() == null){
textView.setText("Cancelled");
}else {
textView.setText(intentResult.getContents());
}
}
super.onActivityResult(requestCode, resultCode, data);
}
}

/***************************/

apply plugin: 'com.android.application'

android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
applicationId "com.example.myqrcodebarcodescanner"
minSdkVersion 26
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

implementation 'com.journeyapps:zxing-android-embedded:4.0.2'
}

/*********************************/