Realize the code scanning function of a custom layout

1. Open source project address ：https://github.com/jenly1314/ZXingLite
2. stay Project Of  build.gradle  Add remote warehouse inside

   allprojects {
       repositories {
           //...
           mavenCentral()
       }
   }

3. stay Module Of  build.gradle  Add and import dependencies

   implementation 'com.github.jenly1314:zxing-lite:2.1.1'

There are several ways to scan code quickly ：

1、 Use it directly CaptureActivity perhaps CaptureFragment.( Pure code scanning , No additives )

2、 By inheritance CaptureActivity perhaps CaptureFragment And customize the layout .（ Applicable to most scenarios , There is no need to care about the logic of scanning code , When customizing the layout, you need to overwrite getLayoutId Method ） Implementation example ：CustomCaptureActivity  and  QRCodeActivity

3、 In your project Activity perhaps Fragment Instantiate a CameraScan that will do .（ It is suitable for writing interactive logic in the code scanning interface , Because of the project structure or other reasons , Cannot inherit directly or indirectly CaptureActivity or CaptureFragment When using ） Implementation example ：CustomActivity

4、 Inherit CameraScan Realize one by yourself , You can refer to the default implementation class DefaultCameraScan, Other steps are the same 3.（ Extended advanced usage , Use caution ）

Example layout

Customizable layout （ overwrite getLayoutId Method ）, At least there should be PreviewView.

PreviewView Used to preview , At least there should be PreviewView, If it's inheritance CaptureActivity or CaptureFragment, Control id Overwritable getPreviewViewId Method customization

ViewfinderView Used to render scanning view , Give users a visual effect , It doesn't matter if you scan the code and recognize it , If it's inheritance CaptureActivity or CaptureFragment, Control id rewritable getViewfinderViewId Method customization , The default is previewView, return 0 Indicates that there is no need to ViewfinderView

ivFlashlight Used for built-in flashlight , If it's inheritance CaptureActivity or CaptureFragment, Control id rewritable getFlashlightId Method customization , The default is ivFlashlight. return 0 It means there is no need for a built-in flashlight . You can also define it yourself

Code example （ QR code / Bar code ）

    // Jump to the default scanning interface 
    startActivityForResult(new Intent(context,CaptureActivity.class),requestCode);

    // Generate qr code 
    CodeUtils.createQRCode(content,600,logo);
    // Generate barcode 
    CodeUtils.createBarCode(content, BarcodeFormat.CODE_128,800,200);
    // Parse barcode / QR code 
    CodeUtils.parseCode(bitmap);
    // Analysis of QR code 
    CodeUtils.parseQRCode(bitmap);

Personal practice records ：

Create a new one activity Inherit CaptureActivity.

package com.efuture.androidmvvmdemo.activity;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.Nullable;

import com.efuture.androidmvvmdemo.R;
import com.gyf.immersionbar.ImmersionBar;
import com.king.zxing.CaptureActivity;
import com.king.zxing.util.CodeUtils;

import java.io.FileNotFoundException;

public class QrCodeActivity extends CaptureActivity implements View.OnClickListener {

    //  Photo album 
    private ImageView iv_photo;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //  Set the status bar color to white 
        ImmersionBar.with(this).statusBarColor(R.color.black)
                .fitsSystemWindows(true).init();
        iv_photo = findViewById(R.id.iv_photo);
        iv_photo.setOnClickListener(this);
    }

    @Override
    public int getLayoutId() {
        return R.layout.activity_qr_code;
    }

    @Override
    public int getFlashlightId() {
        return R.id.ll_Flashlight;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //  Photo album 
            case R.id.iv_photo:
                // Open album 
                Intent intent = new  Intent(Intent.ACTION_PICK);
                // Specify that what you get is a picture 
                intent.setType("image/*");
                startActivityForResult(intent, 1);
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode != Activity.RESULT_OK) {
            return;
        }
        switch (requestCode) {
            //  If you return from the album 
            case 1:
                if (data != null) {
                    Uri uris;
                    uris = data.getData();
                    Bitmap bitmap = null;
                    // Uri Turn into Bitmap
                    try {
                        bitmap = getBitmapFromUri(uris);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                    // Generate qr code 
                    CodeUtils.createQRCode("aaaaa", 600, bitmap);
                    // Analysis of QR code 
                    String s = CodeUtils.parseQRCode(bitmap);
                    Toast.makeText(this, s, Toast.LENGTH_SHORT).show();
                }

                break;
        }
    }

    // Uri Turn into Bitmap
    private Bitmap getBitmapFromUri(Uri uri) throws FileNotFoundException {
        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
        return bitmap;
    }
}

This is the layout file ：

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv_center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"/>

    <androidx.camera.view.PreviewView
        android:id="@+id/previewView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <com.king.zxing.ViewfinderView
        android:id="@+id/viewfinderView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <androidx.appcompat.widget.AppCompatImageView
        android:layout_marginTop="21dp"
        android:id="@+id/iv_new_back"
        android:layout_width="24dp"
        android:layout_height="22dp"
        android:layout_marginStart="12dp"
        android:src="@mipmap/return_white"/>
    <TextView
        android:layout_marginTop="20dp"
        android:layout_centerHorizontal="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Open pre Duobao , You can scan the code and pay at a glance "
        android:textColor="@color/personal_word_color"
        android:textSize="17sp"
        android:gravity="center"
        android:layout_gravity="center" />

    <LinearLayout
        android:id="@+id/ll_Flashlight"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/tv_center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <ImageView
            android:layout_marginTop="120dp"
            android:id="@+id/ivFlashlight"
            android:layout_width="30dp"
            android:layout_height="60dp"
            android:layout_gravity="center"
            android:src="@drawable/zxl_flashlight_selector"/>
        <TextView
            android:layout_below="@+id/ivFlashlight"
            android:layout_centerHorizontal="true"
            android:id="@+id/tv_illuminate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=" Touch to illuminate "
            android:textColor="@color/white"
            android:textSize="17sp"
            android:gravity="center"
            android:layout_gravity="center" />
    </LinearLayout>

    <RelativeLayout
        android:layout_marginStart="15dp"
        android:layout_marginEnd="15dp"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="100dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <ImageView
            android:id="@+id/iv_Payment"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:src="@mipmap/icon_detail_star" />
        <TextView
            android:textColor="@color/white"
            android:layout_below="@+id/iv_Payment"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=" Payment code " />

        <ImageView
            android:layout_alignParentEnd="true"
            android:id="@+id/iv_photo"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:src="@mipmap/icon_detail_star" />
        <TextView
            android:layout_alignParentEnd="true"
            android:textColor="@color/white"
            android:layout_below="@+id/iv_photo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=" Photo album " />
    </RelativeLayout>
</RelativeLayout>

Jump to this activity, The code scanning interface will open .

//  Skip the code scanning interface 
startActivityForResult(new Intent(requireContext(), QrCodeActivity.class), 1);