本文实例为大家分享了Android实现扫描二维码的具体代码，供大家参考，具体内容如下

1.效果图：

2.引用公共库:builder.radle，在app目录下

implementation 'com.google.android.gms:play-services-maps:17.0.0'implementation 'com.google.android.gms:play-services-vision:19.0.0'implementation 'com.google.android.gms:auth-api-impl:11.6.0'

3.清单文件，拍照权限申请

<uses-permission android:name="android.permission.CAMERA" />

4.主界面：

package com.example.administrator.testz; import android.Manifest;import android.app.Activity;import android.content.ActivityNotFoundException;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.pm.PackageManager;import android.content.res.Resources;import android.net.Uri;import android.os.Bundle;import android.os.PersistableBundle;import android.os.Vibrator;import android.util.Log;import android.util.SparseArray;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.widget.TextView; import com.google.android.gms.vision.CameraSource;import com.google.android.gms.vision.Detector;import com.google.android.gms.vision.barcode.Barcode;import com.google.android.gms.vision.barcode.BarcodeDetector; import java.io.IOException;import java.util.ArrayList; import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import androidx.core.app.ActivityCompat; public class MainActivity extends AppCompatActivity { SurfaceView surfaceView; CameraSource cameraSource; TextView qrCodeText; BarcodeDetector barcodeDetector; public static ArrayList<String> scannList; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); surfaceView = (SurfaceView) findViewById(R.id.qrView); qrCodeText = (TextView) findViewById(R.id.tv); scannList = new ArrayList<>(); barcodeDetector = new BarcodeDetector.Builder(this) .setBarcodeFormats(Barcode.QR_CODE) .build(); cameraSource = new CameraSource.Builder(this, barcodeDetector) .setRequestedPreviewSize(640, 480) .setAutoFocusEnabled(true) .build(); surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { return; } try { cameraSource.start(holder); } catch (IOException e) { e.printStackTrace(); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { cameraSource.stop(); } }); barcodeDetector.setProcessor(new Detector.Processor<Barcode>() { @Override public void release() { } @Override public void receiveDetections(Detector.Detections<Barcode> detections) { final SparseArray<Barcode> qrCode = detections.getDetectedItems(); if (qrCode.size() != 0) { qrCodeText.post(new Runnable() { @Override public void run() { qrCodeText.setText(qrCode.valueAt(0).displayValue); addInList(qrCode.valueAt(0).displayValue); } }); } } }); } private void addInList(String scannResult) { if (scannList.isEmpty()) { scannList.add(scannResult); } else { String a = scannList.get(scannList.size() - 1); if (!a.equals(scannResult)) { scannList.add(scannResult); } } for (String s : scannList) { Log.e("s", "onCreate: " + s); } Log.e("size", "addInList: " + scannList.size()); } @Override protected void onDestroy() { super.onDestroy(); }}

5.布局页面：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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="com.example.administrator.testz.MainActivity"> <SurfaceView android:id="@+id/qrView" android:layout_width="300dp" android:layout_height="300dp" android:layout_marginStart="32dp" android:layout_marginLeft="32dp" android:layout_marginEnd="32dp" android:layout_marginRight="32dp" android:orientation="vertical" /> <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:text="TextView" android:textSize="30sp" /> </RelativeLayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。