android快速集成Zxing以及自定义扫描界面

直接在build文件中添加依赖：
implementation 'com.journeyapps:zxing-android-embedded:3.6.0'

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.hdc.test"
        minSdkVersion 23
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    //添加Zxing依赖
    implementation 'com.journeyapps:zxing-android-embedded:3.6.0'

}

布局文件：

Activity:

package com.hdc.test;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
import com.journeyapps.barcodescanner.CaptureActivity;

/**
 * 这是调用者
 */

public class MainActivity extends Activity {

    private Context context;
    private Button QrOpen;
    private final static int REQUEST_CODE = 1001;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = this;

        QrOpen = (Button) findViewById(R.id.QrOpen);
        QrOpen.setOnClickListener(QrOpenListener);

    }

    private View.OnClickListener QrOpenListener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //打开扫描界面扫描条形码或二维码
            Intent intent = new Intent(context, CaptureActivity.class);
            startActivityForResult(intent, REQUEST_CODE);
        }
    };

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            IntentResult scanResult = IntentIntegrator.parseActivityResult(resultCode, data);
            final String qrContent = scanResult.getContents();
            Toast.makeText(context, "扫描结果:" + qrContent, Toast.LENGTH_SHORT).show();
        }
    }
}

结果：

Screenrecorder-2019-03-01-16-53-48-372.gif

默认的扫描界面是横屏的，可以自定义界面。

自定义扫描界面

自定义View并且继承ViewfinderView：

package com.hdc.test;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Rect;
import android.graphics.Shader;
import android.util.AttributeSet;

import com.google.zxing.ResultPoint;
import com.journeyapps.barcodescanner.ViewfinderView;

import java.util.ArrayList;
import java.util.List;

/**
 * 自定义扫描界面
 */

public class QrView extends ViewfinderView {

    public int laserLinePosition = 0;
    public float[] position = new float[]{0f, 0.5f, 1f};
    public int[] colors = new int[]{0x0027B14D, 0xff27B14D, 0x0027B14D};
    public LinearGradient linearGradient;
    private int ScreenRate;

    public QrView(Context context, AttributeSet attrs) {
        super(context, attrs);
        float density = context.getResources().getDisplayMetrics().density;
        ScreenRate = (int) (15 * density);
    }

    @Override
    public void onDraw(Canvas canvas) {
        int CORNER_WIDTH = 15;
        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(getResources().getColor(R.color.green));//定义画笔的颜色
        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);

        // 画出外部（即构图矩形之外）变暗
        paint.setColor(resultBitmap != null ? resultColor : maskColor);
        canvas.drawRect(0, 0, width, frame.top, paint);
        canvas.drawRect(0, frame.top, frame.left, frame.bottom, paint);
        canvas.drawRect(frame.right, frame.top, width, frame.bottom, paint);
        canvas.drawRect(0, frame.bottom, 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 {

            laserLinePosition = laserLinePosition + 8;
            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 currentPossible = possibleResultPoints;
            List 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);
        }
    }
}

view_qr.xml：

activity_qr.xml（然后把view_qr.xml设置到app:zxing_scanner_layout）：

扫描的Activity:

package com.hdc.test;

import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;

import com.journeyapps.barcodescanner.CaptureManager;
import com.journeyapps.barcodescanner.DecoratedBarcodeView;

public class QRActivity extends AppCompatActivity {

    private DecoratedBarcodeView mDBV;
    private CaptureManager captureManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_qr);

        mDBV = (DecoratedBarcodeView) findViewById(R.id.dbv);

        captureManager = new CaptureManager(this, mDBV);
        captureManager.initializeFromIntent(getIntent(), savedInstanceState);
        captureManager.decode();
    }

    private View.OnClickListener BackListener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            finish();
        }
    };

    @Override
    public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
        super.onSaveInstanceState(outState, outPersistentState);
        captureManager.onSaveInstanceState(outState);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return mDBV.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }

    @Override
    protected void onPause() {
        super.onPause();
        captureManager.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        captureManager.onResume();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        captureManager.onDestroy();
    }
}

最后将MainActivity中的QrOpenListener中的代码稍作修改：

package com.hdc.test;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

/**
 * 这是调用者
 */

public class MainActivity extends Activity {

    private Context context;
    private Button QrOpen;
    private final static int REQUEST_CODE = 1001;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = this;

        QrOpen = (Button) findViewById(R.id.QrOpen);
        QrOpen.setOnClickListener(QrOpenListener);
    }

    private View.OnClickListener QrOpenListener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //打开扫描界面
            IntentIntegrator intentIntegrator = new IntentIntegrator(MainActivity.this);
            intentIntegrator.setOrientationLocked(false);
            intentIntegrator.setCaptureActivity(QRActivity.class); // 设置自定义的activity是QRActivity
            intentIntegrator.setRequestCode(REQUEST_CODE);
            intentIntegrator.initiateScan();
        }
    };

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            IntentResult scanResult = IntentIntegrator.parseActivityResult(resultCode, data);
            final String qrContent = scanResult.getContents();
            Toast.makeText(context, "扫描结果:" + qrContent, Toast.LENGTH_SHORT).show();
        }
    }
}

Screenrecorder-2019-03-01-16-31-12-730.gif

已完成测试！有不对的地方欢迎指出，感恩。