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
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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
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<uses-permission android:name= "android.permission.CAMERA" /> |
4.主界面:
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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:
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<? 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服务器之家。
原文链接:https://blog.csdn.net/cf8833/article/details/104007496