一 简介
1.1 ZXing
目前Android扫描二维码，条形码主要用google官方的工具Zxing，支持扫码，相册解码，生成带logo的二维码等功能
Zxing github 示例地址：https://github.com/zxing/zxing
1.2 ZBar
由于zxing是基于java编写的，扫码速度和解析上可能没那么快，但大部分场合足够用。也有基于c/c++的库zbar，需要编译通过才能用，下面是官网，有兴趣的可以编译试试：
ZBar官网：http://zbar.sourceforge.net/ ZBar GitHub地址：https://github.com/ZBar/ZBar
1.3 华为ScanKit
目前体验最好的华为统一扫码SDK，基本可以做到秒扫和快速识别，支持多码识别和二维码生成。但该服务必须在华为开发者联盟平台注册应用，配置包名和服务json
https://gitee.com/hms-core/hms-scan-demo华为官方demo示例 gitee地址：https://gitee.com/hms-core/hms-scan-demo
二 Zxing使用
2.1 依赖远程zxing库
dependencies {
//zxing的core库
implementation "com.google.zxing:core:3.5.1"
//zxing
implementation "com.google.zxing:zxing-parent:3.5.1"
//zxing
implementation 'com.journeyapps:zxing-android-embedded:4.1.0'
}
或直接使用下面库，目前识别比较快的Zxing库
implementation 'com.journeyapps:zxing-android-embedded:4.3.0'
2.2 添加权限
2.3 调用SDK的扫码页面并返回结果
/**
* 跳转到扫码界面扫码
*/
private void goScan(){
Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivityForResult(intent, REQUEST_CODE_SCAN);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// 扫描二维码/条码回传
if (requestCode == REQUEST_CODE_SCAN && resultCode == RESULT_OK) {
if (data != null) {
//返回的文本内容
String content = data.getStringExtra(DECODED_CONTENT_KEY);
//返回的BitMap图像
Bitmap bitmap = data.getParcelableExtra(DECODED_BITMAP_KEY);
}
}
}
三 自定义扫码页面
3.1 效果图
3.2 activity_scan.xml
xmlns:my_view="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> android:id="@+id/rim" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#C0C0C0"> android:id="@+id/surfaceView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center"/>
android:layout_width="match_parent" android:layout_height="56dp" android:gravity="center_vertical"> android:layout_marginStart="10sp" android:layout_toEndOf="@+id/back_img" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_vertical" android:text="扫码" android:textAllCaps="false" android:textColor="#FFFFFF" android:textSize="20sp" android:textStyle="bold" /> android:id="@+id/back_img" android:layout_width="48dp" android:layout_height="48dp" android:padding="12dp" android:layout_alignParentStart="true" android:layout_marginStart="12dp" android:layout_marginTop="4dp" android:gravity="center" android:src="@drawable/back" /> android:id="@+id/tv_decode" android:layout_width="wrap_content" android:layout_height="match_parent" android:gravity="center_vertical" android:text="解码器" android:textAllCaps="false" android:textColor="#FFFFFF" android:textSize="20sp" android:textStyle="bold" android:layout_alignParentEnd="true" android:layout_marginEnd="12dp" android:layout_marginTop="4dp" /> android:id="@+id/img_btn" android:layout_width="48dp" android:layout_height="48dp" android:padding="12dp" android:layout_alignParentEnd="true" android:layout_marginEnd="12dp" android:layout_marginTop="4dp" android:gravity="center" android:visibility="gone" android:src="@drawable/photo" /> 3.3 ScanActivity.java public class ScanActivity extends Activity { public static final int REQUEST_CODE_PHOTO = 0X1113; private static final String TAG = "ScanActivity"; private Camera camera = null; private Camera.Parameters parameters = null; private boolean isPreview = false; private FrameCallback frameCallback = new FrameCallback(); private int width = 1920; private int height = 1080; private double defaultZoom = 1.0; private SurfaceHolder surfaceHolder; private SurfaceCallBack surfaceCallBack; private CommonHandler handler; private boolean isShow; private FrameLayout rim; private SurfaceView surfaceView; private ImageView backImg; private TextView tvDecode; private ImageView imgBtn; private int shortSize; private int longSize; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_common); rim = (FrameLayout) findViewById(R.id.rim); surfaceView = (SurfaceView) findViewById(R.id.surfaceView); backImg = (ImageView) findViewById(R.id.back_img); tvDecode = (TextView) findViewById(R.id.tv_decode); imgBtn = (ImageView) findViewById(R.id.img_btn); checkCameraPermission(); } //权限请求 public final int REQUEST_CAMERA_PERMISSION = 1; private String cameraPermission = Manifest.permission.CAMERA; private void checkCameraPermission() { //检查是否有相机权限 if (ContextCompat.checkSelfPermission(this, cameraPermission) != PackageManager.PERMISSION_GRANTED) { //没权限，请求权限 ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION); } else { //有权限 createSurfaceView(); } } //权限请求回调 @Override public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) { switch (requestCode) { case REQUEST_CAMERA_PERMISSION: if (grantResults != null && grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { //用户同意权限 createSurfaceView(); } else { // 权限被用户拒绝了，可以提示用户,关闭界面等等。 Toast.makeText(this, "拒绝权限，请去设置里面手动开启权限", Toast.LENGTH_SHORT).show(); } break; } } /** * 创建预览 */ private void createSurfaceView() { surfaceCallBack = new SurfaceCallBack(); adjustSurface(surfaceView); surfaceHolder = surfaceView.getHolder(); isShow = false; setBackOperation(); setPictureScanOperation(); setDecodeSelectOperation(); } private void adjustSurface(SurfaceView cameraPreview) { FrameLayout.LayoutParams paramSurface = (FrameLayout.LayoutParams) cameraPreview.getLayoutParams(); if (getSystemService(Context.WINDOW_SERVICE) != null) { WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE); Display defaultDisplay = windowManager.getDefaultDisplay(); Point outPoint = new Point(); defaultDisplay.getRealSize(outPoint); int sceenWidth = outPoint.x; int sceenHeight = outPoint.y; shortSize = Math.min(sceenWidth, sceenHeight); longSize = shortSize; //横屏 paramSurface.width = shortSize; paramSurface.height = shortSize; // float rate; // if (sceenWidth / (float) 1080 > sceenHeight / (float) 1920) { // rate = sceenWidth / (float) 1080; // int targetHeight = (int) (1920 * rate); // paramSurface.width = FrameLayout.LayoutParams.MATCH_PARENT; // paramSurface.height = targetHeight; // int topMargin = (int) (-(targetHeight - sceenHeight) / 2); // if (topMargin < 0) { // paramSurface.topMargin = topMargin; // } // } else { // rate = sceenHeight / (float) 1920; // int targetWidth = (int) (1080 * rate); // paramSurface.width = targetWidth; // paramSurface.height = FrameLayout.LayoutParams.MATCH_PARENT; // int leftMargin = (int) (-(targetWidth - sceenWidth) / 2); // if (leftMargin < 0) { // paramSurface.leftMargin = leftMargin; // } // } } } private void setBackOperation() { backImg.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); } private void setPictureScanOperation() { imgBtn = findViewById(R.id.img_btn); imgBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent pickIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); pickIntent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*"); ScanActivity.this.startActivityForResult(pickIntent, REQUEST_CODE_PHOTO); } }); } private int decodeType = 1; private void setDecodeSelectOperation() { tvDecode.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (decodeType == 1) { decodeType = 2; tvDecode.setText("Sunmin"); } else if (decodeType == 2) { decodeType = 3; tvDecode.setText("HuaweiHms"); } else if (decodeType == 3) { decodeType = 1; tvDecode.setText("Zxing"); } } }); tvDecode.setText("Zxing"); } @Override protected void onResume() { super.onResume(); if (isShow) { initCamera(); } else { surfaceHolder.addCallback(surfaceCallBack); } } @Override protected void onPause() { if (handler != null) { handler.quit(); handler = null; } close(); if (!isShow) { surfaceHolder.removeCallback(surfaceCallBack); } super.onPause(); } @Override protected void onDestroy() { super.onDestroy(); } private void initCamera() { open(surfaceHolder); if (handler == null) { handler = new CommonHandler(); } else { startPreview(); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); // if (resultCode != RESULT_OK || data == null || requestCode != REQUEST_CODE_PHOTO) { // return; // } // try { // decodeMultiSyn(MediaStore.Images.Media.getBitmap(this.getContentResolver(), data.getData())); // } catch (Exception e) { // Log.e(TAG, Objects.requireNonNull(e.getMessage())); // } } class SurfaceCallBack implements SurfaceHolder.Callback { @Override public void surfaceCreated(SurfaceHolder holder) { if (!isShow) { isShow = true; initCamera(); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { isShow = false; } } /// /** * Open up the camera. */ public synchronized void open(SurfaceHolder holder) { try { camera = Camera.open(0); parameters = camera.getParameters(); //获取合适的预览尺寸，保证不变形 Camera.Size bestSize = getBestSize(parameters); //设置预览大小 parameters.setPreviewSize(bestSize.width, bestSize.height); parameters.setPictureSize(width, height); parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE); parameters.setPictureFormat(ImageFormat.NV21); camera.setPreviewDisplay(holder); camera.setDisplayOrientation(90); //camera.setDisplayOrientation(270); camera.setParameters(parameters); } catch (Exception e) { e.printStackTrace(); } } /** * 获取预览最佳尺寸 */ private Camera.Size getBestSize(Camera.Parameters parameters) { List Camera.Size bestSize = null; float uiRatio = (float) longSize / shortSize; float minRatio = uiRatio; for (Camera.Size previewSize : sizes) { float cameraRatio = (float) previewSize.width / previewSize.height; //如果找不到比例相同的，找一个最近的,防止预览变形 float offset = Math.abs(cameraRatio - minRatio); if (offset < minRatio) { minRatio = offset; bestSize = previewSize; } //比例相同 if (uiRatio == cameraRatio) { bestSize = previewSize; break; } } return bestSize; } public synchronized void close() { if (camera != null) { camera.stopPreview(); camera.release(); camera = null; } } public synchronized void startPreview() { if (camera != null && !isPreview) { camera.startPreview(); isPreview = true; } } public synchronized void stopPreview() { if (camera != null && isPreview) { camera.stopPreview(); frameCallback.setProperties(null); isPreview = false; } } public synchronized void callbackFrame(Handler handler, double zoomValue) { if (camera != null && isPreview) { frameCallback.setProperties(handler); if (camera.getParameters().isZoomSupported() && zoomValue != defaultZoom) { //Auto zoom. //parameters.setZoom(convertZoomInt(zoomValue)); camera.setParameters(parameters); } camera.setOneShotPreviewCallback(frameCallback); } } public int convertZoomInt(double zoomValue) { List float maxZoom = Math.round(allZoomRatios.get(allZoomRatios.size() - 1) / 100f); if (zoomValue >= maxZoom) { return allZoomRatios.size() - 1; } for (int i = 1; i < allZoomRatios.size(); i++) { if (allZoomRatios.get(i) >= (zoomValue * 100) && allZoomRatios.get(i - 1) <= (zoomValue * 100)) { return i; } } return -1; } class FrameCallback implements Camera.PreviewCallback { private Handler handler; public void setProperties(Handler handler) { this.handler = handler; } @Override public void onPreviewFrame(byte[] data, Camera camera) { if (handler != null) { Message message = handler.obtainMessage(0, camera.getParameters().getPreviewSize().width, camera.getParameters().getPreviewSize().height, data); message.sendToTarget(); handler = null; } } } // class CommonHandler extends Handler { private static final String TAG = "MainHandler"; private static final double DEFAULT_ZOOM = 1.0; private HandlerThread decodeThread; private Handler decodeHandle; private BeepManager beepManager; private long preTime; public CommonHandler() { beepManager = new BeepManager(ScanActivity.this); decodeThread = new HandlerThread("DecodeThread"); decodeThread.start(); decodeHandle = new Handler(decodeThread.getLooper()) { @Override public void handleMessage(Message msg) { if (msg == null) { return; } long startTime=System.currentTimeMillis(); String result = decodeSyn(msg.arg1, msg.arg2, (byte[]) msg.obj); long endTime=System.currentTimeMillis(); if (result == null) { restart(DEFAULT_ZOOM); } else { Message message = new Message(); message.what = msg.what; message.obj = result; message.arg1= (int) (endTime-startTime); CommonHandler.this.sendMessage(message); } } }; startPreview(); restart(DEFAULT_ZOOM); } @Override public void handleMessage(Message message) { if (message.what == 0) { String result = (String) message.obj; Log.e(TAG, result); long currentTime = System.currentTimeMillis(); if (currentTime - preTime > 200) { preTime = currentTime; beepManager.playBeepSoundAndVibrate(); restart(DEFAULT_ZOOM); stopPreview(); Intent intent = new Intent(ScanActivity.this, ResultActivity.class); intent.putExtra("result", result); intent.putExtra("time", message.arg1); startActivity(intent); } } } public void quit() { try { stopPreview(); decodeHandle.getLooper().quit(); decodeThread.join(500); } catch (InterruptedException e) { Log.w(TAG, e); } } public void restart(double zoomValue) { callbackFrame(decodeHandle, zoomValue); } /** * Call the MultiProcessor API in synchronous mode. */ private String decodeSyn(int width, int height, byte[] data) { String result=""; switch (decodeType){ case 1://Zxing result = ZxingUtils.decode(width, height, data); break; case 2://商米 result = SunmiUtils.decode(width, height, data); break; case 3://华为 result = HuaweiHmsUtils.decode(width, height, data, ScanActivity.this); break; } return result; } } } 3.4 解析工具类 public class ZxingUtils { public static String decode(int width, int height, byte[] data) { Map hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); Result rawResult = null; PlanarYUVLuminanceSource source = buildLuminanceSource(data, width, height); MultiFormatReader multiFormatReader = null; if (source != null) { BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); try { multiFormatReader = new MultiFormatReader(); multiFormatReader.setHints(hints); rawResult = multiFormatReader.decodeWithState(bitmap); } catch (ReaderException re) { // continue } finally { multiFormatReader.reset(); } } if(rawResult==null){ return null; }else { return rawResult.getText(); } } /** * A factory method to build the appropriate LuminanceSource object based on the format * of the preview buffers, as described by Camera.Parameters. * * @param data A preview frame. * @param width The width of the image. * @param height The height of the image. * @return A PlanarYUVLuminanceSource instance. */ public static PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) { Rect rect = new Rect(0,0,width,height); if (rect == null) { return null; } // Go ahead and assume it's YUV rather than die. return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), false); } } 四 相册选区图片解析二维码 4.1 选择相册图片 private void setPictureScanOperation() { imgBtn = findViewById(R.id.img_btn); imgBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent pickIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); pickIntent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*"); ZxingActivity.this.startActivityForResult(pickIntent, REQUEST_CODE_PHOTO); } }); } 4.2 本地图片文件转换成可解码二维码的 Bitmap /** * 将本地图片文件转换成可解码二维码的 Bitmap。为了避免图片太大，这里对图片进行了压缩。 * * @param picturePath 本地图片文件路径 */ public static Bitmap getDecodeAbleBitmap(String picturePath) { try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(picturePath, options); int sampleSize = options.outHeight / 400; if (sampleSize <= 0) { sampleSize = 1; } options.inSampleSize = sampleSize; options.inJustDecodeBounds = false; return BitmapFactory.decodeFile(picturePath, options); } catch (Exception e) { e.printStackTrace(); return null; } } 4.3 解析二维码图片 /** * 同步解析bitmap二维码。该方法是耗时操作，请在子线程中调用。 * * @param bitmap 要解析的二维码图片 * @return 返回二维码图片里的内容 或 null */ public static String syncDecodeQRCode(Bitmap bitmap) { Result result; RGBLuminanceSource source = null; try { int width = bitmap.getWidth(); int height = bitmap.getHeight(); int[] pixels = new int[width * height]; bitmap.getPixels(pixels, 0, width, 0, 0, width, height); source = new RGBLuminanceSource(width, height, pixels); result = new MultiFormatReader().decode(new BinaryBitmap(new HybridBinarizer(source)), new EnumMap<>(DecodeHintType.class)); return result.getText(); } catch (Exception e) { e.printStackTrace(); if (source != null) { try { result = new MultiFormatReader().decode(new BinaryBitmap(new GlobalHistogramBinarizer(source)), new EnumMap<>(DecodeHintType.class)); return result.getText(); } catch (Throwable e2) { e2.printStackTrace(); } } return null; } } 五 生成二维码 5.1 支持修改边框颜色大小，二维码颜色大小，背景颜色，logo样式和圆角 5.2 activity_qrcode_style_xml android:layout_width="match_parent" android:layout_height="match_parent"> android:id="@+id/v_image" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_marginLeft="40dp" android:layout_marginRight="40dp" /> 5.3 核心生成二维码源码，QRCodeEncoder.java public class QRCodeEncoder { public static final Map static { HINTS.put(EncodeHintType.CHARACTER_SET, "utf-8"); HINTS.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); HINTS.put(EncodeHintType.MARGIN, 0); } private QRCodeEncoder() { } /** * 同步创建黑色前景色、白色背景色的二维码图片。该方法是耗时操作，请在子线程中调用。 * * @param content 要生成的二维码图片内容 * @param size 图片宽高，单位为px */ public static Bitmap syncEncodeQRCode(String content, int size) { return syncEncodeQRCode(content, size, Color.BLACK, Color.WHITE, null); } /** * 同步创建指定前景色、白色背景色的二维码图片。该方法是耗时操作，请在子线程中调用。 * * @param content 要生成的二维码图片内容 * @param size 图片宽高，单位为px * @param foregroundColor 二维码图片的前景色 */ public static Bitmap syncEncodeQRCode(String content, int size, int foregroundColor) { return syncEncodeQRCode(content, size, foregroundColor, Color.WHITE, null); } /** * 同步创建指定前景色、白色背景色、带logo的二维码图片。该方法是耗时操作，请在子线程中调用。 * * @param content 要生成的二维码图片内容 * @param size 图片宽高，单位为px * @param foregroundColor 二维码图片的前景色 * @param logo 二维码图片的logo */ public static Bitmap syncEncodeQRCode(String content, int size, int foregroundColor, Bitmap logo) { return syncEncodeQRCode(content, size, foregroundColor, Color.WHITE, logo); } /** * 同步创建指定前景色、指定背景色、带logo的二维码图片。该方法是耗时操作，请在子线程中调用。 * * @param content 要生成的二维码图片内容 * @param size 图片宽高，单位为px * @param foregroundColor 二维码图片的前景色 * @param backgroundColor 二维码图片的背景色 * @param logo 二维码图片的logo */ public static Bitmap syncEncodeQRCode(String content, int size, int foregroundColor, int backgroundColor, Bitmap logo) { try { BitMatrix matrix = new MultiFormatWriter().encode(content, 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 (matrix.get(x, y)) { pixels[y * size + x] = foregroundColor; } else { pixels[y * size + x] = backgroundColor; } } } Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, size, 0, 0, size, size); return addLogoToQRCode(bitmap, logo); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 同步创建指定前景色、指定背景色、带logo的二维码图片。该方法是耗时操作，请在子线程中调用。 * * @param content 要生成的二维码图片内容 * @param size 图片宽高，单位为px * @param foregroundColor 二维码图片的前景色 * @param backgroundColor 二维码图片的背景色 * @param logo 二维码图片的logo * @param borderColor 边框颜色 */ public static Bitmap syncEncodeQRCode(String content, int size, int foregroundColor, int backgroundColor, Bitmap logo ,int border , int borderColor) { int borderWidth= (int) dp2px(MyApp.getInstance(),4); size-=borderWidth*2; try { BitMatrix matrix = new MultiFormatWriter().encode(content, 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 (matrix.get(x, y)) { pixels[y * size + x] = foregroundColor; } else { pixels[y * size + x] = backgroundColor; } } } Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, size, 0, 0, size, size); if(bitmap!=null){ bitmap=addLogoToQRCode(bitmap, logo); } bitmap=addBorderToQRCode(bitmap,backgroundColor ,border,borderColor); return bitmap; } catch (Exception e) { e.printStackTrace(); return null; } } /** * 添加logo到二维码图片上 */ private static Bitmap addBorderToQRCode(Bitmap src, int backgroundColor, int border , int borderColor) { if (src == null) { return src; } if(borderColor==0){ borderColor=Color.parseColor("#63C99B"); } int srcWidth = src.getWidth(); int srcHeight = src.getHeight(); int borderWidth= (int) dp2px(MyApp.getInstance(),4); Bitmap bitmap = Bitmap.createBitmap(srcWidth+borderWidth, srcHeight+borderWidth, Bitmap.Config.ARGB_8888); try { Canvas canvas = new Canvas(bitmap); canvas.drawColor(backgroundColor); if(border!=0){ Paint paintRect = new Paint(); paintRect.setColor(borderColor); paintRect.setStrokeWidth(borderWidth); if(border==1){ paintRect.setPathEffect(new DashPathEffect(new float[]{8, 8}, 0)); // 设置虚线样式 } paintRect.setStyle(Paint.Style.STROKE); canvas.drawRect(0, 0, bitmap.getWidth(), bitmap.getHeight(), paintRect); } canvas.drawBitmap(src, borderWidth/2f, borderWidth/2f, null); canvas.save(); canvas.restore(); } catch (Exception e) { e.printStackTrace(); bitmap = null; } return bitmap; } /** * 添加logo到二维码图片上 */ private static Bitmap addLogoToQRCode(Bitmap src, Bitmap logo) { if (src == null || logo == null) { return src; } int srcWidth = src.getWidth(); int srcHeight = src.getHeight(); int logoWidth = logo.getWidth(); int logoHeight = logo.getHeight(); float scaleFactor = srcWidth * 1.0f / 5 / logoWidth; Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888); try { Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(src, 0, 0, null); canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2); canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null); canvas.save(); canvas.restore(); } catch (Exception e) { e.printStackTrace(); bitmap = null; } return bitmap; } /** * 同步创建条形码图片 * * @param content 要生成条形码包含的内容 * @param width 条形码的宽度，单位px * @param height 条形码的高度，单位px * @param textSize 字体大小，单位px，如果等于0则不在底部绘制文字 * @return 返回生成条形的位图 */ public static Bitmap syncEncodeBarcode(String content, int width, int height, int textSize) { if (TextUtils.isEmpty(content)) { return null; } Map hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hints.put(EncodeHintType.MARGIN, 0); try { BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.CODE_128, width, height, hints); int[] pixels = new int[width * height]; for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { if (bitMatrix.get(x, y)) { pixels[y * width + x] = 0xff000000; } else { pixels[y * width + x] = 0xffffffff; } } } Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, width, 0, 0, width, height); if (textSize > 0) { bitmap = showContent(bitmap, content, textSize); } return bitmap; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 显示条形的内容 * * @param barcodeBitmap 已生成的条形码的位图 * @param content 条形码包含的内容 * @param textSize 字体大小，单位px * @return 返回生成的新条形码位图 */ private static Bitmap showContent(Bitmap barcodeBitmap, String content, int textSize) { if (TextUtils.isEmpty(content) || null == barcodeBitmap) { return null; } Paint paint = new Paint(); paint.setColor(Color.BLACK); paint.setAntiAlias(true); paint.setStyle(Paint.Style.FILL); paint.setTextSize(textSize); paint.setTextAlign(Paint.Align.CENTER); int textWidth = (int) paint.measureText(content); Paint.FontMetrics fm = paint.getFontMetrics(); int textHeight = (int) (fm.bottom - fm.top); float scaleRateX = barcodeBitmap.getWidth() * 1.0f / textWidth; if (scaleRateX < 1) { paint.setTextScaleX(scaleRateX); } int baseLine = barcodeBitmap.getHeight() + textHeight; Bitmap bitmap = Bitmap.createBitmap(barcodeBitmap.getWidth(), barcodeBitmap.getHeight() + 2 * textHeight, Bitmap.Config.ARGB_4444); Canvas canvas = new Canvas(); canvas.drawColor(Color.WHITE); canvas.setBitmap(bitmap); canvas.drawBitmap(barcodeBitmap, 0, 0, null); canvas.drawText(content, barcodeBitmap.getWidth() / 2, baseLine, paint); canvas.save(); canvas.restore(); return bitmap; } public static float dp2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return dpValue * scale + 0.5f; } } 5.4 异步调用QRCodeEncoder生成二维码 private void updateQrcode(){ new GenerateQrcodeTask().execute(content); } public class GenerateQrcodeTask extends AsyncTask @Override protected Bitmap doInBackground(String... strings) { Bitmap logoBitmap=null; if(logo!=0){ logoBitmap = BitmapFactory.decodeResource(getResources(), logo); } int borderColor22=TextUtils.isEmpty(borderColor)?0:Color.parseColor(borderColor); return QRCodeEncoder.syncEncodeQRCode(strings[0], (int) StatuesBarUtils.dp2px(mContext, 300f), Color.parseColor(qianColor),Color.parseColor(beinColor),logoBitmap, border , borderColor22); } @Override protected void onPostExecute(Bitmap bitmap) { super.onPostExecute(bitmap); qrBitmap=bitmap; if (bitmap != null) { mDataBinding.vImage.setImageBitmap(qrBitmap); } else { Toast.makeText(mContext, "生成維碼失敗", Toast.LENGTH_SHORT).show(); } } } 5.5 保存二维码，FileUtil.java工具类 public class FileUtil { public static String saveToImage(Bitmap bitmap) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { return MediaStore.Images.Media.insertImage(MyApp.getInstance().getContentResolver(), bitmap, "", ""); } else { try { File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "qrcode"); if (!dir.exists()) { dir.mkdirs(); } File picFile = new File(dir, System.currentTimeMillis() + ".png"); FileOutputStream fos = new FileOutputStream(picFile); bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.flush(); fos.close(); return picFile.getAbsolutePath(); } catch (Exception e) { e.printStackTrace(); } } return null; } 异步调用FileUtil，保存二维码 public class SaveBitmapTask extends AsyncTask @Override protected String doInBackground(Bitmap... bitmaps) { return FileUtil.saveToImage(bitmaps[0]); } @Override protected void onPostExecute(String result) { super.onPostExecute(result); if (result != null) { Intent intent = new Intent(mContext, QrBarcodeEditResultActivity.class); intent.putExtra("filePath", result); startActivity(intent); } else { Toast.makeText(mContext, "保存二維碼失敗", Toast.LENGTH_SHORT).show(); } } } 5.6 核心源码解析，我们知道bitmap是一个保存所有像素内容的容器，那二维码原理即是把内容解析到每一个像素里面。如下 /** * * @param content 要生成的二维码图片内容 * @param size 图片宽高，单位为px * @param foregroundColor 二维码图片的前景色 * @param backgroundColor 二维码图片的背景色 * @param logo 二维码图片的logo * @param borderColor 边框颜色 */ public static Bitmap syncEncodeQRCode(String content, int size, int foregroundColor, int backgroundColor, Bitmap logo ,int border , int borderColor) { int borderWidth= (int) dp2px(MyApp.getInstance(),4); size-=borderWidth*2; try { //内容解析到字节矩阵 BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, size, size, HINTS); //设置宽高像素数组 int[] pixels = new int[size * size]; //遍历记录图片每个像素信息 for (int y = 0; y < size; y++) { for (int x = 0; x < size; x++) { if (matrix.get(x, y)) { pixels[y * size + x] = foregroundColor; } else { pixels[y * size + x] = backgroundColor; } } } //创建bitmap,设置像素数组 Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, size, 0, 0, size, size); if(bitmap!=null){ bitmap=addLogoToQRCode(bitmap, logo); } //添加logo bitmap=addBorderToQRCode(bitmap,backgroundColor ,border,borderColor); return bitmap; } catch (Exception e) { e.printStackTrace(); return null; } } 推荐阅读
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