QR code generation and scanning

We've seen QR code before. There's no nonsense here. We'll go to dry goods directly.

step

  • Import dependency
    compile 'com.google.zxing:core:3.2.1'      //zxing core dependency
    compile 'com.journeyapps:zxing-android-embedded:3.3.0'  //Generate QR code dependency
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  • Generate QR code
    Here, a ZxingUtils is encapsulated. Its main function is to generate the Bitmap object of the QR code. There is no more way to call the tool class, just to generate a click event
package com.example.zxingtest.utils;

import android.graphics.Bitmap;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.journeyapps.barcodescanner.BarcodeEncoder;

/**
 * Created by D'Russel on 2017/7/31.
 */

public class ZxingUtils {


   public static Bitmap createBitmap(String str){
        Bitmap bitmap = null;
        BitMatrix result = null;
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        try {
            result = multiFormatWriter.encode(str, BarcodeFormat.QR_CODE, 400, 400);
            BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
            bitmap = barcodeEncoder.createBitmap(result);
        } catch (WriterException e){
            e.printStackTrace();
        } catch (IllegalArgumentException iae){ // ?
            return null;
        }
        return bitmap;
    }

}
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  • Realize the function of scanning QR code

Add a button to the layout file activity main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.zxingtest.activity.MainActivity">

    <TextView
        android:id="@+id/tv_test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ImageView
        android:id="@+id/pic_test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btn_test"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Generate QR code"/>

    <Button
        android:id="@+id/btn_test2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Scan QR code"/>

</LinearLayout>
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In MainActivity

package com.example.zxingtest.activity;

import android.content.Intent;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.zxingtest.R;
import com.example.zxingtest.utils.ZxingUtils;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

/**
 * Created by D'Russel on 2017/7/31.
 */


public class MainActivity extends AppCompatActivity{
    @BindView(R.id.tv_test)
    TextView tv_test;
    @BindView(R.id.pic_test)
    ImageView img_test;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
    }
     //Generate QR code
    @OnClick(R.id.btn_test)
    public void onTest(View view){
        Bitmap bitmap = ZxingUtils.createBitmap("hahahaha");
        img_test.setImageBitmap(bitmap);


    }

    //Scan QR code
    @OnClick(R.id.btn_test2)
    public void onTest2(View view){
        new IntentIntegrator(this)
                .setOrientationLocked(false)
                .setCaptureActivity(ScanActivity.class) // Set the custom activity as ScanActivity
                .initiateScan(); // Initialize scan
    }


    @Override
// Get the scanned value through the method of onActivityResult
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        IntentResult intentResult = IntentIntegrator.parseActivityResult(requestCode,resultCode,data);
        if(intentResult != null) {
            if(intentResult.getContents() == null) {
                Toast.makeText(this,"Content is empty",Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this,"Scan success",Toast.LENGTH_LONG).show();
                // ScanResult is the obtained string
                String ScanResult = intentResult.getContents();
                tv_test.setText(ScanResult);
            }
        } else {
            super.onActivityResult(requestCode,resultCode,data);
        }
    }

}
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Here is a scan activity as a scan box. First, look at the layout file activity_scan.xml. Here is a scan box. The scan function of QR code is provided by this scan box

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.example.zxingtest.activity.ScanActivity">


    <com.journeyapps.barcodescanner.DecoratedBarcodeView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/dbv"
        app:zxing_framing_rect_width="200dp"
        app:zxing_framing_rect_height="200dp"
        app:zxing_preview_scaling_strategy="fitXY"
        app:zxing_use_texture_view="true"
       >
    </com.journeyapps.barcodescanner.DecoratedBarcodeView>

</RelativeLayout>
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In ScanActivity

package com.example.zxingtest.activity;

import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.example.zxingtest.R;
import com.journeyapps.barcodescanner.CaptureManager;
import com.journeyapps.barcodescanner.DecoratedBarcodeView;
import butterknife.BindView;
import butterknife.ButterKnife;

/**
 * Created by D'Russel on 2017/7/31.
 */


public class ScanActivity extends AppCompatActivity{


    @BindView(R.id.dbv) DecoratedBarcodeView mDBV;
    private CaptureManager captureManager;     //Capture Manager

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

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

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

    @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 onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);
        ButterKnife.bind(this);
        captureManager = new CaptureManager(this,mDBV);
        captureManager.initializeFromIntent(getIntent(),savedInstanceState);
        captureManager.decode();
    }
}
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Here's an explanation of CaptureManager
The Chinese name of CaptureManager is capture manager. It can be seen from the name that this is the manager of capture content processing in the scan box. Then the above code is well understood. We make its life cycle the same as that of Activity.

Generate QR Code:

Scan QR code:

Keywords: Android ButterKnife Google xml

Added by mpunn on Sun, 05 Jan 2020 23:42:42 +0200

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