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Print barcode --fix #30

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merged 1 commit into from
Apr 11, 2024
Merged

Print barcode --fix #30

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26 changes: 16 additions & 10 deletions android/src/main/java/com/react_native_code_generator/RNCodeGeneratorModule.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,8 @@
import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import java.util.Map;

import android.graphics.Color;
import android.graphics.Canvas;
import javax.annotation.Nullable;

/**
Expand Down Expand Up @@ -103,27 +104,32 @@ public void generateCode(ReadableMap params, Promise promise) {

@ReactMethod
public String generateBarcode(BarcodeFormat type, String contents, int width, int height) throws Exception {
Map hints = new HashMap<>();
Map<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.MARGIN, 0); //先设置margin为1
BitMatrix matrix = new MultiFormatWriter()
.encode(contents, type, width, height, hints);
hints.put(EncodeHintType.MARGIN, 0); // Set margin to 0
BitMatrix matrix = new MultiFormatWriter().encode(contents, type, width, height, hints);

// Create a Bitmap with a white background
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.WHITE);

int matrixWidth = matrix.getWidth();
int matrixHeight = matrix.getHeight();
int[] pixels = new int[matrixWidth * matrixHeight];

// Draw the barcode on the white background
for (int y = 0; y < matrixHeight; y++) {
for (int x = 0; x < matrixWidth; x++) {
if (matrix.get(x, y)) {
pixels[y * matrixWidth + x] = 0xff000000;
bitmap.setPixel(x, y, Color.BLACK);
}
}
}
Bitmap bitmap = Bitmap.createBitmap(matrixWidth, matrixHeight,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, matrixWidth, 0, 0, matrixWidth, matrixHeight);

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
String barcodeBase64 = Base64.encodeToString(outputStream.toByteArray(), Base64.DEFAULT);

return barcodeBase64;
}

Expand Down