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首先将LibZxing库下载导入android studio直接使用即可

清单文件application中配置zxing相关

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidzxing">

    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name="com.google.zxing.client.android.CaptureActivity2"
            android:configChanges="orientation|keyboardHidden"
            android:screenOrientation="portrait"
            android:theme="@style/AppTheme.Transparent"
            android:windowSoftInputMode="stateAlwaysHidden">
            <intent-filter>
                <action android:name="com.google.zxing.client.android.SCAN" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <!--
				Allow web apps to launch Barcode Scanner by linking to
				http://zxing.appspot.com/scan.
            -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data
                    android:host="zxing.appspot.com"
                    android:path="/scan"
                    android:scheme="http" />
            </intent-filter>
            <!-- We also support a Google Product Search URL. -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data
                    android:host="www.google.com"
                    android:path="/m/products/scan"
                    android:scheme="http" />
            </intent-filter>
            <!-- And the UK version. -->
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data
                    android:host="www.google.co.uk"
                    android:path="/m/products/scan"
                    android:scheme="http" />
            </intent-filter>
        </activity>
    </application>

</manifest>

扫描

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private static final int SCAN_REQUEST_CODE = 100;
    private static final int CAMERA_PERMISSION = 110;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        if (Build.VERSION.SDK_INT > 22) {
            if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.CAMERA}, CAMERA_PERMISSION);
            } else {
                startScanActivity();
            }
        } else {
            startScanActivity();
        }
    }

    private void startScanActivity() {
        Intent intent = new Intent(MainActivity.this, CaptureActivity2.class);
        intent.putExtra(CaptureActivity2.USE_DEFUALT_ISBN_ACTIVITY, true);
        startActivityForResult(intent, SCAN_REQUEST_CODE);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case CAMERA_PERMISSION:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    startScanActivity();
                } else {
                    Toast.makeText(MainActivity.this, "请手动打开摄像头权限", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
                break;
        }
    }

    @Override
    public int checkSelfPermission(String permission) {
        return super.checkSelfPermission(permission);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == SCAN_REQUEST_CODE) {
                //Todo Handle the isbn number entered manually
                String isbn = data.getStringExtra("CaptureIsbn");
                if (!TextUtils.isEmpty(isbn)) {
                    //todo something
                    Toast.makeText(this, "解析到的内容为" + isbn, Toast.LENGTH_LONG).show();

                }
            }
        }
    }
}

LibZxing请在demo中下载demo链接