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Android掃描二維碼（基于華為HMS Core）

一、背景

之前一直用開源的Zxing來掃描二維碼，但是随着使用場景的複雜，Zxing的識别就捉襟見肘了。很多場景下Zxing都很難識别，比如：綠底白紋的二維碼；光線較暗的場景；二維碼比較小的場景……

使用者在識别的時候，會去與微信支付寶的二維碼識别做比較，如果微信支付寶能識别，而我們自己的APP無法識别，使用者評價就會極其糟糕。

我們這裡就找到了更好的二維碼識别方案，就是基于華為的HMS Core的二維碼識别功能。

二、開發準備

​​HMS Core官網​​

1、首先登入​​AppGallery Connect​​網站，添加項目，項目中再添加應用。

2、在“項目設定 > 正常”頁面的“應用”區域，點選“agconnect-services.json”下載下傳配置檔案。

Android掃描二維碼（基于華為HMS Core）

3、将“agconnect-services.json”檔案拷貝到應用級根目錄下。

Android掃描二維碼（基于華為HMS Core）

4、配置項目級的build.gradle

buildscript {
    repositories {
        google()
        jcenter()
        // 配置HMS Core SDK的Maven倉位址。
        maven {url 'https://developer.huawei.com/repo/'}
    }
    dependencies {
        ...
        // 增加AGC插件配置，請您參見AGC插件依賴關系選擇合适的AGC插件版本。
        classpath 'com.huawei.agconnect:agcp:1.6.0.300'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        // 配置HMS Core SDK的Maven倉位址。
        maven {url 'https://developer.huawei.com/repo/'}
    }
}

5、在app級的build.gradle中引用依賴

dependencies {
    ...
    implementation 'com.huawei.hms:scan:2.6.0.300'
}

在檔案頭部聲明

apply plugin: 'com.huawei.agconnect'

三、建構代碼

1、調用預設界面 
HmsScanAnalyzerOptions options = new HmsScanAnalyzerOptions.Creator()
      .setHmsScanTypes(HmsScan.QRCODE_SCAN_TYPE, HmsScan.DATAMATRIX_SCAN_TYPE)//此處配置識别二維碼格式
      .create();
ScanUtil.startScan(this, REQUEST_CODE_SCAN_ONE, options);

使用onActivityResult接收掃碼結果

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode != RESULT_OK || data == null) {
        return;
    }
    if (requestCode == REQUEST_CODE_SCAN_ONE) {
        // 導入圖檔掃描傳回結果
        HmsScan obj = data.getParcelableExtra(ScanUtil.RESULT);
        if (obj != null) {
            // 展示解碼結果
            showResult(obj);
         }
    }
}
2、自定義掃碼界面

自定義Activity：DefinedActivity

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.os.Bundle;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.huawei.hms.hmsscankit.OnLightVisibleCallBack;
import com.huawei.hms.hmsscankit.OnResultCallback;
import com.huawei.hms.hmsscankit.RemoteView;
import com.huawei.hms.hmsscankit.ScanUtil;
import com.huawei.hms.ml.scan.HmsScan;
import com.huawei.hms.ml.scan.HmsScanAnalyzerOptions;

import java.io.IOException;

public class DefinedActivity extends Activity {
    private FrameLayout frameLayout;
    private RemoteView remoteView;
    private ImageView backBtn;
    private ImageView imgBtn;
    private ImageView flushBtn;
    int mScreenWidth;
    int mScreenHeight;
    //The width and height of scan_view_finder is both 240 dp.
    final int SCAN_FRAME_SIZE = 240;

    private int[] img = {R.drawable.flashlight_on, R.drawable.flashlight_off};
    private static final String TAG = "DefinedActivity";

    //Declare the key. It is used to obtain the value returned from Scan Kit.
    public static final String SCAN_RESULT = "scanResult";
    public static final int REQUEST_CODE_PHOTO = 0X1113;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_defined);
        // Bind the camera preview screen.
        frameLayout = findViewById(R.id.rim);

        //1. Obtain the screen density to calculate the viewfinder's rectangle.
        DisplayMetrics dm = getResources().getDisplayMetrics();
        float density = dm.density;
        //2. Obtain the screen size.
        mScreenWidth = getResources().getDisplayMetrics().widthPixels;
        mScreenHeight = getResources().getDisplayMetrics().heightPixels;

        int scanFrameSize = (int) (SCAN_FRAME_SIZE * density);

        //3. Calculate the viewfinder's rectangle, which in the middle of the layout.
        //Set the scanning area. (Optional. Rect can be null. If no settings are specified, it will be located in the middle of the layout.)
        Rect rect = new Rect();
        rect.left = mScreenWidth / 2 - scanFrameSize / 2;
        rect.right = mScreenWidth / 2 + scanFrameSize / 2;
        rect.top = mScreenHeight / 2 - scanFrameSize / 2;
        rect.bottom = mScreenHeight / 2 + scanFrameSize / 2;


        //Initialize the RemoteView instance, and set callback for the scanning result.
        remoteView = new RemoteView.Builder().setContext(this).setBoundingBox(rect).
//                setFormat(HmsScan.ALL_SCAN_TYPE). //此處設定二維碼格式
                build();
        // When the light is dim, this API is called back to display the flashlight switch.
        flushBtn = findViewById(R.id.flush_btn);
        remoteView.setOnLightVisibleCallback(new OnLightVisibleCallBack() {
            @Override
            public void onVisibleChanged(boolean visible) {
                if(visible){
                    flushBtn.setVisibility(View.VISIBLE);
                }
            }
        });
        // Subscribe to the scanning result callback event.
        remoteView.setOnResultCallback(new OnResultCallback() {
            @Override
            public void onResult(HmsScan[] result) {
                //Check the result.
                if (result != null && result.length > 0 && result[0] != null && !TextUtils.isEmpty(result[0].getOriginalValue())) {
                    Intent intent = new Intent();
                    intent.putExtra(SCAN_RESULT, result[0]);
                    setResult(RESULT_OK, intent);
                    DefinedActivity.this.finish();
                }
            }
        });
        // Load the customized view to the activity.
        remoteView.onCreate(savedInstanceState);
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
        frameLayout.addView(remoteView, params);
        // Set the back, photo scanning, and flashlight operations.
        setBackOperation();
        setPictureScanOperation();
        setFlashOperation();
    }

    /**
     * Call the lifecycle management method of the remoteView activity.
     */
    private void setPictureScanOperation() {
        imgBtn = findViewById(R.id.img_btn);
        imgBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent pickIntent = new Intent(Intent.ACTION_PICK,
                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                pickIntent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                DefinedActivity.this.startActivityForResult(pickIntent, REQUEST_CODE_PHOTO);

            }
        });
    }

    private void setFlashOperation() {
        flushBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (remoteView.getLightStatus()) {
                    remoteView.switchLight();
                    flushBtn.setImageResource(img[1]);
                } else {
                    remoteView.switchLight();
                    flushBtn.setImageResource(img[0]);
                }
            }
        });
    }

    private void setBackOperation() {
        backBtn = findViewById(R.id.back_img);
        backBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DefinedActivity.this.finish();
            }
        });
    }

    /**
     * Call the lifecycle management method of the remoteView activity.
     */
    @Override
    protected void onStart() {
        super.onStart();
        remoteView.onStart();
    }

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

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

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

    @Override
    protected void onStop() {
        super.onStop();
        remoteView.onStop();
    }

    /**
     * Handle the return results from the album.
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE_PHOTO) {
            try {
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), data.getData());
                HmsScan[] hmsScans = ScanUtil.decodeWithBitmap(DefinedActivity.this, bitmap, new HmsScanAnalyzerOptions.Creator().setPhotoMode(true).create());
                if (hmsScans != null && hmsScans.length > 0 && hmsScans[0] != null && !TextUtils.isEmpty(hmsScans[0].getOriginalValue())) {
                    Intent intent = new Intent();
                    intent.putExtra(SCAN_RESULT, hmsScans[0]);
                    setResult(RESULT_OK, intent);
                    DefinedActivity.this.finish();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

調用DefinedActivity

Intent intent = new Intent(mUniSDKInstance.getContext(), DefinedActivity.class);
            ((Activity)mUniSDKInstance.getContext()).startActivityForResult(intent, REQUEST_CODE);

接收結果

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == REQUEST_CODE && data.hasExtra("respond")) {
            Log.e("Test", "原生頁面傳回----"+data.getStringExtra("respond"));
            
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
3、圖檔解析模式

還有種解析圖檔的模式，這裡就不做介紹了，自行查找​​官網​​中的說明。

android HMS Core scan
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