安卓使用zxing生成二維碼
阿新 • • 發佈：2020-12-23
前言:時至今日,二維碼的用途非常廣泛,前段時間,有人找我要一個輸入字串生成二維碼的apk,想想這個簡單,就寫了一個!
先導包
implementation 'com.google.zxing:core:3.2.1' implementation 'cn.bingoogolapple:bga-qrcodecore:[email protected]' implementation 'cn.bingoogolapple:bga-zxing:[email protected]' implementation 'com.github.bumptech.glide:glide:4.9.0' annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0'
這裡我使用了zxing以及glide,前者是生成二維碼的庫,後者是圖片載入框架,網上都有示例我就不介紹了,今天主要是介紹二維碼生成器,不廢話了直接上程式碼,先佈局,後代碼:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical"> <EditText android:id="@+id/Numbers" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="@dimen/x10" android:hint="請輸入所要轉化成二維碼的內容" android:padding="@dimen/x10" android:text="網路異常" /> <EditText android:id="@+id/ColorCode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="請輸入二維碼顏色值(範圍0-10.預設0黑色)" android:padding="@dimen/x10" android:text="0" /> <Button android:id="@+id/QrCode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="生成二維碼" /> <ImageView android:id="@+id/QrCodeImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="@dimen/x10" /> </LinearLayout>
這裡主要就四個控制元件,一個是內容,一個是顏色值,這個值是自己可以控制的,等會你們就知道了,剩下一個按鈕一個imageview是顯示二維碼的
package com.airiche.qrcodetest import android.graphics.Color import android.os.Bundle import android.text.TextUtils import android.util.Log import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import com.bumptech.glide.Glide import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) QrCode.setOnClickListener { //生成二維碼 var context = Numbers.text.trim().toString() var mColor = Color.BLACK when (ColorCode.text.toString()) { "0" -> { mColor = Color.BLACK } "1" -> { mColor = Color.DKGRAY } "2" -> { mColor = Color.GRAY } "3" -> { mColor = Color.LTGRAY } "4" -> { mColor = Color.WHITE } "5" -> { mColor = Color.RED } "6" -> { mColor = Color.GREEN } "7" -> { mColor = Color.BLUE } "8" -> { mColor = Color.YELLOW } "9" -> { mColor = Color.CYAN } "10" -> { mColor = Color.MAGENTA } } var bitmap = ZXingUtils.createQRImage(context, 800, 800, mColor) Glide.with(this).load(bitmap).into(QrCodeImage) } } }
這裡的顏色值是我們自己控制的,最終的生成就在ZXingUtils
package com.airiche.qrcodetest;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PointF;
import android.view.Gravity;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import java.util.Hashtable;
/**
* 生成條形碼和二維碼的工具
*/
public class ZXingUtils {
/**
* 生成二維碼 要轉換的地址或字串,可以是中文
*
* @param url
* @param width
* @param height
* @return
*/
public static Bitmap createQRImage(String url, final int width, final int height,int color) {
try {
// 判斷URL合法性
if (url == null || "".equals(url) || url.length() < 1) {
return null;
}
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
// 影象資料轉換，使用了矩陣轉換
BitMatrix bitMatrix = new QRCodeWriter().encode(url,
BarcodeFormat.QR_CODE, width, height, hints);
int[] pixels = new int[width * height];
// 下面這裡按照二維碼的演算法，逐個生成二維碼的圖片，
// 兩個for迴圈是圖片橫列掃描的結果
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * width + x] = color;
} else {
pixels[y * width + x] = 0xffffffff;
}
}
}
// 生成二維碼圖片的格式，使用ARGB_8888
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
} catch (WriterException e) {
e.printStackTrace();
}
return null;
}
/**
* 生成條形碼
*
* @param context
* @param contents
* 需要生成的內容
* @param desiredWidth
* 生成條形碼的寬頻
* @param desiredHeight
* 生成條形碼的高度
* @param displayCode
* 是否在條形碼下方顯示內容
* @return
*/
public static Bitmap creatBarcode(Context context, String contents,
int desiredWidth, int desiredHeight, boolean displayCode) {
Bitmap ruseltBitmap = null;
/**
* 圖片兩端所保留的空白的寬度
*/
int marginW = 20;
/**
* 條形碼的編碼型別
*/
BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;
if (displayCode) {
Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,
desiredWidth, desiredHeight);
Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2
* marginW, desiredHeight, context);
ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(
0, desiredHeight));
} else {
ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,
desiredWidth, desiredHeight);
}
return ruseltBitmap;
}
/**
* 生成條形碼的Bitmap
*
* @param contents
* 需要生成的內容
* @param format
* 編碼格式
* @param desiredWidth
* @param desiredHeight
* @return
* @throws WriterException
*/
protected static Bitmap encodeAsBitmap(String contents,
BarcodeFormat format, int desiredWidth, int desiredHeight) {
final int WHITE = 0xFFFFFFFF;
final int BLACK = 0xFF000000;
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result = null;
try {
result = writer.encode(contents, format, desiredWidth,
desiredHeight, null);
} catch (WriterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
// All are 0, or black, by default
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
/**
* 生成顯示編碼的Bitmap
*
* @param contents
* @param width
* @param height
* @param context
* @return
*/
protected static Bitmap creatCodeBitmap(String contents, int width,
int height, Context context) {
TextView tv = new TextView(context);
WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT);
tv.setLayoutParams(layoutParams);
tv.setText(contents);
tv.setHeight(height);
tv.setGravity(Gravity.CENTER_HORIZONTAL);
tv.setWidth(width);
tv.setDrawingCacheEnabled(true);
tv.setTextColor(Color.BLACK);
tv.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());
tv.buildDrawingCache();
Bitmap bitmapCode = tv.getDrawingCache();
return bitmapCode;
}
/**
* 將兩個Bitmap合併成一個
*
* @param first
* @param second
* @param fromPoint
* 第二個Bitmap開始繪製的起始位置（相對於第一個Bitmap）
* @return
*/
protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,
PointF fromPoint) {
if (first == null || second == null || fromPoint == null) {
return null;
}
int marginW = 20;
Bitmap newBitmap = Bitmap.createBitmap(
first.getWidth() + second.getWidth() + marginW,
first.getHeight() + second.getHeight(), Bitmap.Config.ARGB_4444);
Canvas cv = new Canvas(newBitmap);
cv.drawBitmap(first, marginW, 0, null);
cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);
cv.save();
cv.restore();
return newBitmap;
}
}這就是最簡單二維碼生成器,其實Zxing還能生成條形碼之類的,也很簡單!這裡只介紹二維碼,你們可以自己去玩!