项目中用到了扫描条形码功能，zing既可以扫描二维码，也可以扫描条形码。集成也比较方便。
zing-android地址：
https://github.com/journeyapps/zxing-android-embedded
参考：
https://www.jianshu.com/p/f862b73d07f7

第一步：添加依赖

compile 'com.journeyapps:zxing-android-embedded:3.5.0'

第二步：定义扫描类继承zing中的类：CaptureActivity

public class ScanActivity extends CaptureActivity {

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

第三步：点击按钮开始扫描

 public void scan(View v) {
        IntentIntegrator integrator = new IntentIntegrator(this);
        // 设置要扫描的条码类型，ONE_D_CODE_TYPES：一维码，QR_CODE_TYPES-二维码
        integrator.setDesiredBarcodeFormats(IntentIntegrator.ONE_D_CODE_TYPES);
        integrator.setCaptureActivity(ScanActivity.class); //设置打开摄像头的Activity
        integrator.setPrompt("请扫描条形码"); //底部的提示文字，设为""可以置空
        integrator.setCameraId(0); //前置或者后置摄像头
        integrator.setBeepEnabled(true); //扫描成功的「哔哔」声，默认开启
        integrator.setBarcodeImageEnabled(true);
        integrator.initiateScan();
    }

第四步：获取返回数据

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        if (scanResult != null) {
            String result = scanResult.getContents();
            mTvResult.setText("扫描结果：" + result);
        }
    }

到此基本完成，如果想用自定义视图，只需要把ScanActivity和对应的布局文件稍作修改即可

自定义：

ScanActivity代码：

package com.app.zingdemo;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.view.KeyEvent;

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

public class ScanActivity extends CaptureActivity {
    private DecoratedBarcodeView dbv;
    private CaptureManager capture;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);
        dbv = (DecoratedBarcodeView) findViewById(R.id.dbv);
        capture = new CaptureManager(this, dbv);
        capture.initializeFromIntent(getIntent(), savedInstanceState);
        capture.decode();

    }

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

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

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

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        capture.onSaveInstanceState(outState);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
        capture.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return dbv.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }
}

布局文件：
可以在布局文件中可以根据业务添加需要的控件。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.app.zingdemo.ScanActivity">
    <com.journeyapps.barcodescanner.DecoratedBarcodeView
        android:id="@+id/dbv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:zxing_scanner_layout="@layout/custom_barcode_scanner">

    </com.journeyapps.barcodescanner.DecoratedBarcodeView>
</LinearLayout>

关联的custom_barcode_scanner文件：
这里可以设置扫描控件BarcodeView的样式

<merge xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <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="100dp"
        app:zxing_framing_rect_width="250dp" />

    <com.journeyapps.barcodescanner.ViewfinderView
        android:id="@+id/zxing_viewfinder_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:zxing_possible_result_points="@color/zxing_custom_possible_result_points"
        app:zxing_result_view="@color/zxing_custom_result_view"
        app:zxing_viewfinder_laser="@color/zxing_custom_viewfinder_laser"
        app:zxing_viewfinder_mask="@color/zxing_custom_viewfinder_mask" />

    <TextView
        android:id="@+id/zxing_status_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|center_horizontal"
        android:background="@color/zxing_transparent"
        android:text="@string/zxing_msg_default_status"
        android:textColor="@color/zxing_status_text" />
</merge>