安卓Zxing的简单使用-（生成二维码与扫一扫）

Love The Way You Lie 2022-12-22 11:17 312阅读 0赞

# 安卓Zxing的简单使用-（生成二维码与扫一扫） #

前言：Zxing -github链接：[https://github.com/zxing/zxing][https_github.com_zxing_zxing]

1、效果图：

![这里写图片描述][70]

zxing自带扫码界面（横屏）

![这里写图片描述][70 1]

自定义扫码界面

![这里写图片描述][70 2]

2、  
build.gradle中加入

implementation 'com.journeyapps:zxing-android-embedded:3.6.0'

3、MainActivity：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    
        private ImageView imageView;
        private TextView textView;
        private EditText editText;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            imageView = this.findViewById(R.id.imageView_zxing);
            textView = this.findViewById(R.id.textview_zxing);
            editText = this.findViewById(R.id.edittext_zxing);
    
            findViewById(R.id.button_zxing).setOnClickListener(this);
            findViewById(R.id.button_start).setOnClickListener(this);
            findViewById(R.id.button_native).setOnClickListener(this);
        }
    
    
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.button_zxing:
                    String count = editText.getText().toString().trim();
                    if (TextUtils.isEmpty(count)) {
                        Toast.makeText(MainActivity.this, "请输入内容", Toast.LENGTH_LONG).show();
                        return;
                    }
                    //生成二维码显示在imageView上
                    imageView.setImageBitmap(generateBitmap(count, 600, 600));
                    break;
                case R.id.button_start:
                    new IntentIntegrator(this)
                            .setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES)// 扫码的类型,可选：一维码，二维码，一/二维码
                            //.setPrompt("请对准二维码")// 设置提示语
                            .setCameraId(0)// 选择摄像头,可使用前置或者后置
                            .setBeepEnabled(true)// 是否开启声音,扫完码之后会"哔"的一声
                            .initiateScan();// 初始化扫码
                    break;
                case R.id.button_native:
                    new IntentIntegrator(this)
                            .setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES)// 扫码的类型,可选：一维码，二维码，一/二维码
                            //.setPrompt("请对准二维码")// 设置提示语
                            .setCameraId(0)// 选择摄像头,可使用前置或者后置
                            .setBeepEnabled(true)// 是否开启声音,扫完码之后会"哔"的一声
                            .setCaptureActivity(QrCodeActivity.class)//自定义扫码界面
                            .initiateScan();// 初始化扫码
                    break;
            }
        }
    
        /**
         * 生成固定大小的二维码(不需网络权限)
         *
         * @param content 需要生成的内容
         * @param width   二维码宽度
         * @param height  二维码高度
         * @return
         */
        private Bitmap generateBitmap(String content, int width, int height) {
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            Map<EncodeHintType, String> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            try {
                BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
                int[] pixels = new int[width * height];
                for (int i = 0; i < height; i++) {
                    for (int j = 0; j < width; j++) {
                        if (encode.get(j, i)) {
                            pixels[i * width + j] = 0x00000000;
                        } else {
                            pixels[i * width + j] = 0xffffffff;
                        }
                    }
                }
                return Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);
            } catch (WriterException e) {
                e.printStackTrace();
            }
            return null;
        }
    
        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            //扫码结果
            IntentResult intentResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
            if (intentResult != null) {
                if (intentResult.getContents() == null) {
                    //扫码失败
                } else {
                    String result = intentResult.getContents();//返回值
                    textView.setText("扫码结果：" + result);
                }
            }
        }
    }

CustomZxingView自定义扫码View

public class CustomZxingView extends ViewfinderView {
    
        public int laserLinePosition = 0;
        public float[] position = new float[]{0f, 0.5f, 1f};
        public int[] colors = new int[]{0xff0699e6, 0xff0699e6, 0xff0699e6};
        public LinearGradient linearGradient;
    
        public CustomZxingView(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
    
        /**
         * 重写draw方法绘制自己的扫描框
         *
         * @param canvas
         */
        @Override
        public void onDraw(Canvas canvas) {
            refreshSizes();
            if (framingRect == null || previewFramingRect == null) {
                return;
            }
    
            Rect frame = framingRect;
            Rect previewFrame = previewFramingRect;
    
            int width = canvas.getWidth();
            int height = canvas.getHeight();
            //绘制4个角
    
            paint.setColor(Color.parseColor("#139D57"));//定义画笔的颜色
            canvas.drawRect(frame.left, frame.top, frame.left + 100, frame.top + 10, paint);
            canvas.drawRect(frame.left, frame.top, frame.left + 10, frame.top + 100, paint);
    
            canvas.drawRect(frame.right - 100, frame.top, frame.right, frame.top + 10, paint);
            canvas.drawRect(frame.right - 10, frame.top, frame.right, frame.top + 100, paint);
    
            canvas.drawRect(frame.left, frame.bottom - 10, frame.left + 100, frame.bottom, paint);
            canvas.drawRect(frame.left, frame.bottom - 100, frame.left + 10, frame.bottom, paint);
    
            canvas.drawRect(frame.right - 100, frame.bottom - 10, frame.right, frame.bottom, paint);
            canvas.drawRect(frame.right - 10, frame.bottom - 100, frame.right, frame.bottom, paint);
            // Draw the exterior (i.e. outside the framing rect) darkened
            paint.setColor(resultBitmap != null ? resultColor : maskColor);
            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(CURRENT_POINT_OPACITY);
                canvas.drawBitmap(resultBitmap, null, frame, paint);
            } else {
                int middle = frame.height() / 2 + frame.top;
                laserLinePosition = laserLinePosition + 5;
                if (laserLinePosition > frame.height()) {
                    laserLinePosition = 0;
                }
                linearGradient = new LinearGradient(frame.left + 1, frame.top + laserLinePosition, frame.right - 1, frame.top + 10 + laserLinePosition, colors, position, Shader.TileMode.CLAMP);
                // Draw a red "laser scanner" line through the middle to show decoding is active
                paint.setShader(linearGradient);
                //绘制扫描线
                canvas.drawRect(frame.left + 1, frame.top + laserLinePosition, frame.right - 1, frame.top + 10 + laserLinePosition, paint);
                paint.setShader(null);
                float scaleX = frame.width() / (float) previewFrame.width();
                float scaleY = frame.height() / (float) previewFrame.height();
    
                List<ResultPoint> currentPossible = possibleResultPoints;
                List<ResultPoint> currentLast = lastPossibleResultPoints;
                int frameLeft = frame.left;
                int frameTop = frame.top;
                if (currentPossible.isEmpty()) {
                    lastPossibleResultPoints = null;
                } else {
                    possibleResultPoints = new ArrayList<>(5);
                    lastPossibleResultPoints = currentPossible;
                    paint.setAlpha(CURRENT_POINT_OPACITY);
                    paint.setColor(resultPointColor);
                    for (ResultPoint point : currentPossible) {
                        canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
                                frameTop + (int) (point.getY() * scaleY),
                                POINT_SIZE, paint);
                    }
                }
                if (currentLast != null) {
                    paint.setAlpha(CURRENT_POINT_OPACITY / 2);
                    paint.setColor(resultPointColor);
                    float radius = POINT_SIZE / 2.0f;
                    for (ResultPoint point : currentLast) {
                        canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
                                frameTop + (int) (point.getY() * scaleY),
                                radius, paint);
                    }
                }
                postInvalidateDelayed(16,
                        frame.left,
                        frame.top,
                        frame.right,
                        frame.bottom);
            }
        }
    }

QrCodeActivity：

public class QrCodeActivity extends AppCompatActivity implements  DecoratedBarcodeView.TorchListener {
    
        private DecoratedBarcodeView decoratedBarcodeView;
        private CaptureManager captureManager;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_qr_code);
    
            decoratedBarcodeView=this.findViewById(R.id.decoratedBarcodeView);
            //重要代码，初始化捕获
            captureManager = new CaptureManager(this, decoratedBarcodeView);
            captureManager.initializeFromIntent(getIntent(), savedInstanceState);
            captureManager.decode();
            decoratedBarcodeView.setTorchListener(this);
        }
    
        @Override
        public void onTorchOn() {
    
        }
    
        @Override
        public void onTorchOff() {
    
        }
    
        @Override
        protected void onPause() {
            super.onPause();
            captureManager.onPause();
        }
    
        @Override
        protected void onResume() {
            super.onResume();
            captureManager.onResume();
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            captureManager.onDestroy();
        }
    
        @Override
        public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
            super.onSaveInstanceState(outState, outPersistentState);
            captureManager.onSaveInstanceState(outState);
        }
    
        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            return decoratedBarcodeView.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
        }
    }

4、布局文件  
activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="5dp"
        tools:context=".MainActivity">
    
        <EditText
            android:id="@+id/edittext_zxing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="输入需要生成二维码的内容" />
    
        <Button
            android:id="@+id/button_zxing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="生成二维码" />
    
        <ImageView
            android:id="@+id/imageView_zxing"
            android:layout_width="match_parent"
            android:layout_height="250dp" />
    
        <Button
            android:id="@+id/button_start"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="开启扫一扫(zxing自带扫码界面)" />
    
        <Button
            android:layout_marginTop="10dp"
            android:id="@+id/button_native"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="开启扫一扫（自定义扫码界面）" />
    
    
        <TextView
            android:id="@+id/textview_zxing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="扫码的结果" />
    
    </LinearLayout>

activity\_qr\_code.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    
        <com.journeyapps.barcodescanner.DecoratedBarcodeView
            android:id="@+id/decoratedBarcodeView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:zxing_framing_rect_height="250dp"
            app:zxing_framing_rect_width="250dp"
            app:zxing_preview_scaling_strategy="fitXY"
            app:zxing_scanner_layout="@layout/layout_zxing"
            app:zxing_use_texture_view="true" />
    
    </LinearLayout>

layout\_zxing.xml

<?xml version="1.0" encoding="utf-8"?>
    <merge xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto">
    
        <com.journeyapps.barcodescanner.BarcodeView
            android:id="@+id/zxing_barcode_surface"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:zxing_framing_rect_height="300dp"
            app:zxing_framing_rect_width="300dp" />
    
        <com.helloworld.zxingdemo.CustomZxingView
            android:id="@+id/zxing_viewfinder_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:zxing_possible_result_points="#139D57"
            app:zxing_result_view="@color/zxing_custom_result_view"
            app:zxing_viewfinder_laser="#fff"
            app:zxing_viewfinder_mask="#60000000" />
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|center_horizontal"
            android:layout_marginBottom="20dp"
            android:text="请对准二维码开始扫描"
            android:textColor="#fff" />
    
    </merge>

[https_github.com_zxing_zxing]: https://github.com/zxing/zxing
[70]: /images/20221120/684ec7d3198e4d3ab20e62ed93059a80.png
[70 1]: /images/20221120/88e32285c12740b0aaf7cecf39038e64.png
[70 2]: /images/20221120/44800f1b1efb4a528eda5de0798bbec6.png