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Android实现扫码功能
来源：jb51　　时间：2021/5/31 18:23:39　　对本文有异议

本文实例为大家分享了Android实现扫码功能的具体代码，供大家参考，具体内容如下

1、引入

  1. implementation 'com.journeyapps:zxing-android-embedded:3.5.0'

2、使用：

  1. public void initScan() {
  2.         IntentIntegrator integrator = new IntentIntegrator(this);
  3.         // 设置要扫描的条码类型，ONE_D_CODE_TYPES：一维码，QR_CODE_TYPES-二维码
  4.         integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
  5.         integrator.setCaptureActivity(ScanActivity.class); //设置打开摄像头的Activity
  6.         integrator.setPrompt(""); //底部的提示文字，设为""可以置空
  7.         integrator.setCameraId(0); //前置或者后置摄像头
  8.         integrator.setBeepEnabled(true); //扫描成功的「哔哔」声，默认开启
  9.         integrator.setBarcodeImageEnabled(true);
  10.         integrator.initiateScan();
  11.     }
  12.  
  13.     @Override
  14.     protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  15.         super.onActivityResult(requestCode, resultCode, intent);
  16.         if (requestCode == IntentIntegrator.REQUEST_CODE) {
  17.             IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
  18.             if (scanResult != null && scanResult.getContents() != null) {
  19.                 String result = scanResult.getContents();
  20.                 LogUtil.d("扫码返回: " + result);
  21.                 try {
  22.                     JSONObject jsonObject = new JSONObject(result);
  23.                     if (jsonObject.has(Constant.USERPOLICEMENID)) {
  24.                        //TODO  逻辑
  25.                      
  26.                     } else {
  27.                         ToastUtil.showShortToast("未扫描到有效的信息");
  28.                     }
  29.                 } catch (Exception e) {
  30.                     ToastUtil.showShortToast("未扫描到有效的信息");
  31.                     e.printStackTrace();
  32.                 }
  33.             } else {
  34.                 ToastUtil.showShortToast("未扫描到有效的信息");
  35.             }
  36.         }
  37.     }

3、ScanActivity

  1. public class ScanActivity extends BackActivity {
  2.  
  3.     @BindView(R.id.dbv)
  4.     DecoratedBarcodeView mDbv;
  5.     private CaptureManager captureManager;
  6.  
  7.     @Override
  8.     protected int getLayoutId() {
  9.         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
  10.         return R.layout.activity_scan;
  11.     }
  12.  
  13.     @Override
  14.     protected void init() {
  15.         super.init();
  16.         captureManager = new CaptureManager(this, mDbv);
  17.         captureManager.initializeFromIntent(getIntent(), getSavedInstanceState());
  18.         captureManager.decode();
  19.     }
  20.  
  21.     @Override
  22.     public void onSaveInstanceState(@NotNull Bundle outState, @NotNull PersistableBundle outPersistentState) {
  23.         super.onSaveInstanceState(outState, outPersistentState);
  24.         captureManager.onSaveInstanceState(outState);
  25.     }
  26.  
  27.     @Override
  28.     public boolean onKeyDown(int keyCode, KeyEvent event) {
  29.         return mDbv.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
  30.     }
  31.  
  32.     @Override
  33.     protected void onPause() {
  34.         super.onPause();
  35.         captureManager.onPause();
  36.     }
  37.  
  38.     @Override
  39.     public void onResume() {
  40.         super.onResume();
  41.         captureManager.onResume();
  42.     }
  43.  
  44.     @Override
  45.     protected void onDestroy() {
  46.         super.onDestroy();
  47.         captureManager.onDestroy();
  48.     }
  49.  
  50. }

4、布局文件

activity_scan

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:app="http://schemas.android.com/apk/res-auto"
  4.     xmlns:tools="http://schemas.android.com/tools"
  5.     android:layout_width="match_parent"
  6.     android:layout_height="match_parent"
  7.     android:orientation="vertical"
  8.     tools:context=".ui.main.alarmassistant.ScanActivity">
  9.  
  10.  
  11.     <com.journeyapps.barcodescanner.DecoratedBarcodeView
  12.         android:id="@+id/dbv"
  13.         android:layout_width="match_parent"
  14.         android:layout_height="match_parent"
  15.         android:fitsSystemWindows="true"
  16.         app:zxing_framing_rect_height="200dp"
  17.         app:zxing_framing_rect_width="200dp"
  18.         app:zxing_preview_scaling_strategy="fitXY"
  19.         app:zxing_scanner_layout="@layout/view_qr"
  20.         app:zxing_use_texture_view="true" />
  21. </LinearLayout>

view_qr

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <merge xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:app="http://schemas.android.com/apk/res-auto">
  4.  
  5.     <com.journeyapps.barcodescanner.BarcodeView
  6.         android:id="@+id/zxing_barcode_surface"
  7.         android:layout_width="match_parent"
  8.         android:layout_height="match_parent"
  9.         app:zxing_framing_rect_height="50dp"
  10.         app:zxing_framing_rect_width="250dp" />
  11.  
  12.     <com.x.x.widget.QrView
  13.         android:id="@+id/zxing_viewfinder_view"
  14.         android:layout_width="match_parent"
  15.         android:layout_height="match_parent"
  16.         app:zxing_possible_result_points="@color/color_white"
  17.         app:zxing_result_view="@color/zxing_custom_result_view"
  18.         app:zxing_viewfinder_laser="@color/color_white"
  19.         app:zxing_viewfinder_mask="@color/zxing_custom_viewfinder_mask" />
  20.  
  21.     <TextView
  22.         android:id="@+id/zxing_status_view"
  23.         android:layout_width="wrap_content"
  24.         android:layout_height="wrap_content"
  25.         android:layout_gravity="bottom|center_horizontal"
  26.         android:layout_marginBottom="30dp"
  27.         android:background="@color/zxing_transparent"
  28.         android:text="@string/zxing_msg_default_status"
  29.         android:textColor="@color/zxing_status_text" />
  30.  
  31.     <com.x.common.widget.MyActionBar
  32.         android:id="@+id/action_bar"
  33.         android:layout_width="match_parent"
  34.         android:layout_height="wrap_content"
  35.         app:dark_mode="true"
  36.         app:title="扫一扫" />
  37. </merge>

5、

  1. /**
  2.  * 自定义扫描界面
  3.  */
  4.  
  5. public class QrView extends ViewfinderView {
  6.  
  7.     public int laserLinePosition = 0;
  8.     public float[] position = new float[]{0f, 0.5f, 1f};
  9.     public int[] colors = new int[]{0x0027B14D, 0xff27B14D, 0x0027B14D};
  10.     public LinearGradient linearGradient;
  11.     private int ScreenRate;
  12.  
  13.     public QrView(Context context, AttributeSet attrs) {
  14.         super(context, attrs);
  15.         float density = context.getResources().getDisplayMetrics().density;
  16.         ScreenRate = (int) (15 * density);
  17.     }
  18.  
  19.     @Override
  20.     public void onDraw(Canvas canvas) {
  21.         int CORNER_WIDTH = 15;
  22.         refreshSizes();
  23.  
  24.         if (framingRect == null || previewFramingRect == null) {
  25.             return;
  26.         }
  27.  
  28.         Rect frame = framingRect;
  29.         Rect previewFrame = previewFramingRect;
  30.  
  31.         int width = canvas.getWidth();
  32.         int height = canvas.getHeight();
  33.         //绘制4个角
  34.  
  35.         paint.setColor(getResources().getColor(R.color.color_white));//定义画笔的颜色
  36.         canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate, frame.top + CORNER_WIDTH, paint);
  37.         canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top + ScreenRate, paint);
  38.  
  39.         canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right, frame.top + CORNER_WIDTH, paint);
  40.         canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top + ScreenRate, paint);
  41.  
  42.         canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left + ScreenRate, frame.bottom, paint);
  43.         canvas.drawRect(frame.left, frame.bottom - ScreenRate, frame.left + CORNER_WIDTH, frame.bottom, paint);
  44.  
  45.         canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH, frame.right, frame.bottom, paint);
  46.         canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate, frame.right, frame.bottom, paint);
  47.  
  48.         // 画出外部（即构图矩形之外）变暗
  49.         paint.setColor(resultBitmap != null ? resultColor : maskColor);
  50.         canvas.drawRect(0, 0, width, frame.top, paint);
  51.         canvas.drawRect(0, frame.top, frame.left, frame.bottom, paint);
  52.         canvas.drawRect(frame.right, frame.top, width, frame.bottom, paint);
  53.         canvas.drawRect(0, frame.bottom, width, height, paint);
  54.  
  55.         if (resultBitmap != null) {
  56.             // Draw the opaque result bitmap over the scanning rectangle
  57.             paint.setAlpha(CURRENT_POINT_OPACITY);
  58.             canvas.drawBitmap(resultBitmap, null, frame, paint);
  59.         } else {
  60.  
  61.             laserLinePosition = laserLinePosition + 8;
  62.             if (laserLinePosition >= frame.height()) {
  63.                 laserLinePosition = 0;
  64.             }
  65.             linearGradient = new LinearGradient(frame.left + 1, frame.top + laserLinePosition, frame.right - 1, frame.top + 10 + laserLinePosition, colors, position, Shader.TileMode.CLAMP);
  66.             // Draw a red "laser scanner" line through the middle to show decoding is active
  67.  
  68.             paint.setShader(linearGradient);
  69.             //绘制扫描线
  70.             canvas.drawRect(frame.left + 1, frame.top + laserLinePosition, frame.right - 1, frame.top + 10 + laserLinePosition, paint);
  71.             paint.setShader(null);
  72.             float scaleX = frame.width() / (float) previewFrame.width();
  73.             float scaleY = frame.height() / (float) previewFrame.height();
  74.  
  75.             List<ResultPoint> currentPossible = possibleResultPoints;
  76.             List<ResultPoint> currentLast = lastPossibleResultPoints;
  77.             int frameLeft = frame.left;
  78.             int frameTop = frame.top;
  79.             if (currentPossible.isEmpty()) {
  80.                 lastPossibleResultPoints = null;
  81.             } else {
  82.                 possibleResultPoints = new ArrayList<>(5);
  83.                 lastPossibleResultPoints = currentPossible;
  84.                 paint.setAlpha(CURRENT_POINT_OPACITY);
  85.                 paint.setColor(resultPointColor);
  86.                 for (ResultPoint point : currentPossible) {
  87.                     canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop + (int) (point.getY() * scaleY), POINT_SIZE, paint);
  88.                 }
  89.             }
  90.             if (currentLast != null) {
  91.                 paint.setAlpha(CURRENT_POINT_OPACITY / 2);
  92.                 paint.setColor(resultPointColor);
  93.                 float radius = POINT_SIZE / 2.0f;
  94.                 for (ResultPoint point : currentLast) {
  95.                     canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop + (int) (point.getY() * scaleY), radius, paint);
  96.                 }
  97.             }
  98.             postInvalidateDelayed(16, frame.left, frame.top, frame.right, frame.bottom);
  99.         }
  100.     }
  101. }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持w3xue。

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