Android二维码扫码集成：https://github.com/zxing/zxing
1.下载下来之后解压，在你的项目中file → new → import module 将该文件夹导入项目，并将app依赖于这个module（如下图）,下面开始使用【开发工具：Android studio】
2.扫码功能：你可以定义个按钮，点击按钮时调用下面的方法（checkCameraPermission()）
//检查是否开启了相机权限【Android 6.0之后必须添加】 private void checkCameraPermission() { if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { //如果没有授权，则请求授权 ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_CALL_CAMERA); } else { //有授权，直接开启摄像头扫描 callCapture("UTF-8");//打开扫码签到 } } private void callCapture(String characterSet) { /** * 获取屏幕的宽度，并将宽度的2/3作为扫码区宽度 */ int width = Tools.getScreenW(getContext()) * 2 / 3; Intent intent = new Intent(); intent.setAction(Intents.Scan.ACTION); // intent.putExtra(Intents.Scan.MODE, Intents.Scan.QR_CODE_MODE); intent.putExtra(Intents.Scan.CHARACTER_SET, characterSet); /** * WIDTH==HEIGHT 设置方形扫码取景区 * 取景区的总宽度是屏幕宽度的2/3——适配所有机型 * */ intent.putExtra(Intents.Scan.WIDTH, width); intent.putExtra(Intents.Scan.HEIGHT, width);// // intent.putExtra(Intents.Scan.PROMPT_MESSAGE, "type your prompt message"); intent.setClass(getContext(), CaptureActivity.class);//进入zxing模块中的CaptureActivity startActivityForResult(intent, REQUEST_CODE); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { //获取扫描结果 if (null != data && requestCode == REQUEST_CODE) { switch (resultCode) { case Activity.RESULT_OK: LogD.d("扫描返回RESULT：\n" + data.getStringExtra(Intents.Scan.RESULT)); LogD.d("扫描返回RESULT_FORMAT：\n" + data.getStringExtra(Intents.Scan.RESULT_FORMAT)); LogD.d("扫描返回URI：\n" + data.toUri(data.getFlags())); getResult(data.getStringExtra(Intents.Scan.RESULT));//获取扫码结果 break; default: break; } } } 【如果你不需要设置取景区域的话，上面的代码，已够用。】
3.设置取景区样式【主要调整zxing模块中的CaptureActivity，CameraManager，ViewfinderView】
第一步：调整扫码界面的样式——扫码界面的顶部添加返回按钮和标题
布局代码如下：
CaptureActivity布局代码
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <SurfaceView android:id="@+id/preview_view" android:layout_width="match_parent" android:layout_height="match_parent" /> <com.google.zxing.client.android.ViewfinderView android:id="@+id/viewfinder_view" android:layout_width="match_parent" android:layout_height="match_parent" /> <include layout="@layout/layout_capture_header" android:layout_width="match_parent" android:layout_height="wrap_content"/> </RelativeLayout> </FrameLayout> layout_capture_header.xml代码：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="5dp" android:background="@color/viewfinder_mask" > <ImageButton android:id="@+id/button_back" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/back" /> <TextView android:id="@+id/textview_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center_vertical" android:text="二维码扫描" android:textColor="@android:color/white" android:textSize="18sp" /> </RelativeLayout> 第二步：添加返回事件（在 CaptureActivity的onResume方法中添加以下代码段 ）【完成了扫码界面的调整】
第三步：调整扫码取景区的相对位置【上面已经传了相对宽度和高度进入CaptureActivity，取景区已经按照这个设置去设置了】【在CameraManager中调整如下——实现扫码取景区位置在偏上】
第四步：调整取景区的四个角，扫码线，取景区下发的提示文字【用以下代码段区替换ViewfinderView】（注释已经很清楚的说明了具体用法，有兴趣的自己去研究哈）
public final class ViewfinderView extends View { private static final String TAG = "log"; /** * 刷新界面的时间 */ private static final long ANIMATION_DELAY = 10L; private static final int OPAQUE = 0xFF; /** * 四个绿色边角对应的长度 */ private int ScreenRate; /** * 四个绿色边角对应的宽度 */ private static final int CORNER_WIDTH = 5; /** * 扫描框中的中间线的宽度 */ private static final int MIDDLE_LINE_WIDTH = 4; /** * 扫描框中的中间线的与扫描框左右的间隙 */ private static final int MIDDLE_LINE_PADDING = 6; /** * 中间那条线每次刷新移动的距离 */ private static final int SPEEN_DISTANCE = 5; /** * 手机的屏幕密度 */ private static float density; /** * 字体大小 */ private static final int TEXT_SIZE = 16; /** * 字体距离扫描框下面的距离 */ private static final int TEXT_PADDING_TOP = 60; /** * 画笔对象的引用 */ private Paint paint; /** * 中间滑动线的最顶端位置 */ private int slideTop; /** * 中间滑动线的最底端位置 */ private int slideBottom; private Bitmap resultBitmap; private final int maskColor; private final int resultColor; private final int resultPointColor; private Collection<ResultPoint> possibleResultPoints; private Collection<ResultPoint> lastPossibleResultPoints; private CameraManager cameraManager; private boolean isFirst; public ViewfinderView(Context context, AttributeSet attrs) { super(context, attrs); density = context.getResources().getDisplayMetrics().density; //将像素转换成dp ScreenRate = (int) (10 * density); paint = new Paint(); Resources resources = getResources(); maskColor = resources.getColor(R.color.viewfinder_mask); resultColor = resources.getColor(R.color.result_view); resultPointColor = resources.getColor(R.color.possible_result_points); possibleResultPoints = new HashSet<ResultPoint>(5); } public void setCameraManager(CameraManager cameraManager) { this.cameraManager = cameraManager; } @Override public void onDraw(Canvas canvas) { if (cameraManager == null) return; //中间的扫描框，你要修改扫描框的大小，去CameraManager里面修改 Rect frame = cameraManager.getFramingRect(); if (frame == null) { return; } //初始化中间线滑动的最上边和最下边 if (!isFirst) { isFirst = true; slideTop = frame.top; slideBottom = frame.bottom; } //获取屏幕的宽和高 int width = canvas.getWidth(); int height = canvas.getHeight(); paint.setColor(resultBitmap != null ? resultColor : maskColor); //画出扫描框外面的阴影部分，共四个部分，扫描框的上面到屏幕上面，扫描框的下面到屏幕下面 //扫描框的左边面到屏幕左边，扫描框的右边到屏幕右边 canvas.drawRect(0, 0, width, frame.top, paint); canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint); canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint); canvas.drawRect(0, frame.bottom + 1, width, height, paint); if (resultBitmap != null) { // Draw the opaque result bitmap over the scanning rectangle paint.setAlpha(OPAQUE); canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint); } else { //画扫描框边上的角，总共8个部分 paint.setColor(Color.GREEN); canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate, frame.top + CORNER_WIDTH, paint); canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top + ScreenRate, paint); canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right, frame.top + CORNER_WIDTH, paint); canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top + ScreenRate, paint); canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left + ScreenRate, frame.bottom, paint); canvas.drawRect(frame.left, frame.bottom - ScreenRate, frame.left + CORNER_WIDTH, frame.bottom, paint); canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH, frame.right, frame.bottom, paint); canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate, frame.right, frame.bottom, paint); //绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE slideTop += SPEEN_DISTANCE; if (slideTop >= frame.bottom) { slideTop = frame.top; } // canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH / 2, // frame.right - MIDDLE_LINE_PADDING, slideTop + MIDDLE_LINE_WIDTH / 2, paint); Rect lineRect = new Rect(); lineRect.left = frame.left; lineRect.right = frame.right; lineRect.top = slideTop; lineRect.bottom = slideTop + 18; canvas.drawBitmap(((BitmapDrawable) (getResources().getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null, lineRect, paint); //画扫描框下面的字() paint.setColor(Color.WHITE); paint.setTextSize(TEXT_SIZE * density); paint.setAlpha(0x40); paint.setTypeface(Typeface.DEFAULT_BOLD); String text = getResources().getString(R.string.scan_text); float textWidth = paint.measureText(text); canvas.drawText(text, (width - textWidth) / 2, (float) (frame.bottom + (float) TEXT_PADDING_TOP * density), paint); Collection<ResultPoint> currentPossible = possibleResultPoints; Collection<ResultPoint> currentLast = lastPossibleResultPoints; if (currentPossible.isEmpty()) { lastPossibleResultPoints = null; } else { possibleResultPoints = new HashSet<ResultPoint>(5); lastPossibleResultPoints = currentPossible; paint.setAlpha(OPAQUE); paint.setColor(resultPointColor); for (ResultPoint point : currentPossible) { canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 6.0f, paint); } } if (currentLast != null) { paint.setAlpha(OPAQUE / 2); paint.setColor(resultPointColor); for (ResultPoint point : currentLast) { canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 3.0f, paint); } } //只刷新扫描框的内容，其他地方不刷新 postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom); } } public void drawViewfinder() { resultBitmap = null; invalidate(); } /** * Draw a bitmap with the result points highlighted instead of the live * scanning display. * * @param barcode An image of the decoded barcode. */ public void drawResultBitmap(Bitmap barcode) { resultBitmap = barcode; invalidate(); } public void addPossibleResultPoint(ResultPoint point) { possibleResultPoints.add(point); } } 效果图：
