# Android Zxing Dependency
###### tags: `Android Dependency`

[TOC]

# Introduction
Barcode/QRcode Dependency for Android.

**Supported formats:**

# How to apply it to the project?
**build.gradle(:project):**
Add *mavenCentral()* in allprojects and buildscript:

repositories {
    mavenCentral()
    google()
    jcenter()
}

**manifest.xml:**
Allow **hardwareAccelerated="true"** into application sector.

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:hardwareAccelerated="true"
    android:supportsRtl="true"
    android:theme="@style/Theme.AndroidDependencies">
    
    ...
    
</application>

**build.gradle(:app):**

//zxing Dependency - Barcode QRCode
def zxing_version = '3.3.0'
implementation "com.google.zxing:core:${zxing_version}"

# Zxing implementation example (QRCODE)
By using QRCodeWriter, we can obtain the base for QRCode production. This one by building one will return a BitMatrix object which will have an int array of 0 and 1. But when we do **(bitMatrix.get(x, y))**, this will return boolean and by using this, you will know which ones to make them become white/black.

But by making the array is not enough, so you need to send the new array into the bitmap creation and like this the QRCode will be crated.

public static Bitmap createQRCode(String text, int size) {
    try {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new QRCodeWriter().encode(text,
                BarcodeFormat.QR_CODE, size, size, hints);
        int[] pixels = new int[size * size];
        for (int y = 0; y < size; y++) {
            for (int x = 0; x < size; x++) {
                if (bitMatrix.get(x, y)) {
                    pixels[y * size + x] = 0xff000000;
                } else {
                    pixels[y * size + x] = 0xffffffff;
                }
            }
        }
        Bitmap bitmap = Bitmap.createBitmap(size, size,
                Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
        return bitmap;
    } catch (WriterException e) {
        e.printStackTrace();
        return null;
    }
}

### Reference

[Bitmap Config](https://developer.android.com/reference/android/graphics/Bitmap.Config)
**ARGB_8888:** Each pixel is stored on 4 bytes.

**EncodeHintType** & **BarcodeFormat** are all from the xzing dependency.

# Reference
https://github.com/zxing/zxing