Android集成Zxing

1.在build文件中添加依赖

dependencies {
    //ZXing
    implementation 'com.google.zxing:core:3.3.3'
    implementation('com.journeyapps:zxing-android-embedded:3.6.0') { transitive = false }

2.之后只需要一行代码就可以调用扫码功能

new IntentIntegrator(this).initiateScan();

然后在当前的Activity中重写onActivityResult去获取结果就ok了

3.自定义扫码界面

因为扫码界面的代码非常少，所以可以新建一个Activity复制它的代码。

1. 新建一个Activity

package com.onepilltest.index;

import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;

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

public class ZxingActivity extends AppCompatActivity {
    private CaptureManager capture;
    private DecoratedBarcodeView bv_barcode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            getWindow().setStatusBarColor(0xffffffff);
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
        }
        setContentView(R.layout.zxing);
        bv_barcode = (DecoratedBarcodeView) findViewById(R.id.bv_barcode);

        capture = new CaptureManager(this, bv_barcode);
        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 bv_barcode.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }
}

1. 然后是View

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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=".Activity.ScanQRCodeActivity">

    <com.journeyapps.barcodescanner.DecoratedBarcodeView
        android:id="@+id/bv_barcode"
        app:zxing_use_texture_view="false"
        app:zxing_preview_scaling_strategy="centerCrop"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

其中DecoratedBarcodeView，它就是扫描界面的核心。

1. 接下来更改跳转代码
   
   new IntentIntegrator(this).setCaptureActivity(ScanQRCodeActivity.class).initiateScan();

上面的方法中多了一个setCaptureActivity()方法，这个方法看源码非常简单了，调用这个方法可以把默认的CaptureActivity替换为我们自定义的ScanQRCodeActivity。

1. 重写onActivityResult()方法，获取返回的参数

@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        Log.e("扫码结果分析", "Cancelled");
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if (result != null) {
            if (result.getContents() == null) {
                Toast.makeText(this, "扫描结果为空", Toast.LENGTH_LONG).show();
            } else {
                String str = result.getContents();
                Toast.makeText(this, str, Toast.LENGTH_LONG).show();
            }
        }
    }

4.如果想停留在当前Activity

可以注释capture.decode();然后添加

//回调
    private BarcodeCallback barcodeCallback = new BarcodeCallback() {
        @Override
        public void barcodeResult(BarcodeResult result) {
            if (result != null){
                Log.e(getClass().getName(), "获取到的扫描结果是：" + result.getText());
                Toast.makeText(getApplicationContext(),result.getText(),Toast.LENGTH_SHORT).show();
                textView.setText(result.getText());
            }
        }

        @Override
        public void possibleResultPoints(List<ResultPoint> resultPoints) {

        }
    };

然后再添加代码bv_barcode.decodeSingle(this.barcodeCallback);设置回调函数。

5.如果想连续扫描

将代码替换

//        bv_barcode.decodeSingle(this.barcodeCallback);//单次扫描
        bv_barcode.decodeContinuous(barcodeCallback);//连续扫描

然后在回调方法和处理方法中添加以下分别调用以下函数

//回调
    private BarcodeCallback barcodeCallback = new BarcodeCallback() {
        @Override
        public void barcodeResult(BarcodeResult result) {
            bv_barcode.resume();
            if (result != null){
                Log.e(getClass().getName(), "获取到的扫描结果是：" + result.getText());
                String myresult = result.getText();
                if (!results.equals(myresult)){
                    results = myresult;
                    Toast.makeText(getApplicationContext(),result.getText(),Toast.LENGTH_SHORT).show();
                    textView.setText(result.getText());
                }
                bv_barcode.resume();
            }
        }

参考：https://blog.csdn.net/asjqkkkk/article/details/80739613

参考：生成二维码和保存二维码