This is a new React Native project, bootstrapped using @react-native-community/cli.

Getting Started

Note: Make sure you have completed the [expo - Environment Setup] before proceeding.

Step 1: Installation

npm install react-native-expo-ezprinter --save

or

yarn add react-native-expo-ezprinter

Step 2: install plugin expo-build-properties

    npx expo install expo-build-properties

Step 3: Declare the plugin in 'app. json' and pass in minSdkVersion

{
  "expo": {
    "name": "expo-app",
    "slug": "expo-app",
    "plugins": [
      [
        "expo-build-properties",
        {
          "android": {
            "minSdkVersion": 26
          }
        }
      ]
    ]
  }
}

Step 4:Initialize the plugin and generate native Android code (required for first use)

  npx expo prebuild --clean

Step 5: Import in React-Native

import EzPrinter, {FontSize, AlignmentType, BarcodeType} from 'react-native-expo-ezprinter';

API

Constants

FontSize : font size AlignmentType : Alignment Type BarcodeType : Barcode Type | Type | Sub type | |:-----:|:-----------:| |FontSize |Default,Small,Medium,Big,DoubleHeight,DoubleWidth,SmallBold,MediumBold,BigBold,DoubleHeightBold,DoubleWidthBold | |AlignmentType |Left,Center,Right | |BarcodeType |barcodeUpca,barcodeUpce,barcodeEan8,barcodeEan13,barcodeCode128,barcodeCode39,barcodeCodeBar,barcodeItf,barcodeCode93,barcodeQrCode |

Method

| Method | Parameter | Return Type | |:-----:|:-----------:|:-----------:| | drawText |strLeft, fontLeft, strMid, fontMid, strRight, fontRight | void | | printText |isAutoFeed | void | | drawLeftRight |strLeft, fontLeft, strRight, fontRight | void | | drawCustom |string, fontSize, align | void | | drawNewLine | | void | | drawOneLine |fontSize | void | | drawOneLineDefault | | void | | drawBarcode |str, align, type | void | | drawBarcodeWithHeight |string, align, type, height | void | | drawQrCode |string, align | void | | drawQrCodeWithHeight |string,align,height | void | | isDeviceSupport | | Promise<number> | | printJson |json | void | | printImageByBase64 |base64, align, isAutoFeed | void | | printImageByArray |byteArray, align, isAutoFeed | void |

  /**
   * Draw text into memory, you can specify the position and font size of the printed text, and you can print the left, middle, and right text at the same line
   * You can continuously use drawText to draw all the contents into memory, and finally use printText to print the contents.
   */
  drawText: (strLeft, fontLeft, strMid, fontMid, strRight, fontRight) => void,
 /**
   * Start printing. Except for image printing, other APIs, such as drawText, just draw the printing content in the memory first, and the printing has not been started yet.
   * This method is to print out the printing content in the memory.Control whether to automatically feed paper through isAutoFeed
   */
  printText: (isAutoFeed) => void,
  /**
   * Draw text into memory, you can print left-aligned and right-aligned content at the same line. It needs to be printed using printText.
   */
  drawLeftRight: (strLeft, fontLeft, strRight, fontRight) => void,
  /**
   * Draw text content to memory, you can specify the size and position of the content. It needs to be printed using printText.
   */
  drawCustom: (string, fontSize, align) => void,
  /**
   * Draw a blank line, similar to a newline.
   */
  drawNewLine: () => void,
  /**
   * Draw a horizontal line, you can specify the thickness of the horizontal line by setting the font size.
   */
  drawOneLine: (fontSize) => void,
  /**
   * Draw a horizontal line, use the default font without specifying the font size
   */
  drawOneLineDefault: () => void,
  /**
   * Draw barcodes, including qrcode, you can specify the alignment position and barcode type of the barcode.
   */
  drawBarcode: (str, align, type) => void,
  /**
   * Draw barcodes, including qrcode, you can specify the alignment position and barcode type of the barcode.
   * The height of the barcode can be specified. No width parameter is required, the width is determined by the specific barcode
   */
  drawBarcodeWithHeight: (string, align, type, height) => void,
   /**
   * Draw qrcode,you can specify the alignment position of the qrcode.
   */
  drawQrCode: (string, align) => void;
  /**
   * Draw qrcode,you can specify the alignment position of the qrcode.
   * The height of the qrcode can be specified. No width parameter is required, the width is determined by the specific qrcode
   */
  drawQrCodeWithHeight: (string,align,height) => void;  
  /**
   * Check whether printing is supported. This method returns true only on goodcom printers. This method allows the app to distinguish printers from different manufacturers.
   */
  isDeviceSupport: () => Promise<string>,
  /**
   * Print the content in json format, which will be parsed by the printer according to the template and formatted for printing
   */
  printJson: (json) => void,
  /**
   * Printing an image using base64 encoding, the Base64 string must start with "data:image/png;base64,"
   * You can set the alignment position of the printed image, and decide whether to automatically feed the paper after printing.
   * If you want to print the text after printing the image, the paper will not be automatically fed.
   */
  printImageByBase64: (base64, align, isAutoFeed) => void,