GoogleMobileVision-BarcodeDetector

Build.Gradle.txt

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.pattyappier.pattyluvapp.no5robot"
        minSdkVersion 27
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.android.support:mediarouter-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.android.gms:play-services:12.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

Layout.xml

<?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"
    android:padding="16dp"
    tools:context=".MainActivity">


    <SurfaceView
        android:layout_width="640dp"
        android:layout_height="480dp"
        android:layout_centerVertical="true"
        android:layout_alignParentStart="true"
        android:id="@+id/camera_view"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/code_info"
        android:layout_marginStart="@+id/camera_view"
        android:textSize="20sp"
        android:text="Nothing to read."
        android:layout_alignParentTop="true"
        />


</RelativeLayout>

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.pattyappier.pattyluvapp.no5robot">

    <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="barcode"/>

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

no5RobotApp-Barcoder.java

package com.pattyappier.pattyluvapp.no5robot;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap;
import com.google.android.gms.vision.barcode.BarcodeDetector;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.Frame;
import android.util.Log;
import android.util.SparseArray;
import android.view.SurfaceView;
import android.widget.TextView;
import com.google.android.gms.vision.CameraSource;
import android.view.SurfaceHolder;
import java.io.IOException;
import com.google.android.gms.vision.Detector;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Bitmap myQRCode = null;
        try {
            myQRCode = BitmapFactory.decodeStream(getAssets().open("myqrcode.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(this).setBarcodeFormats(Barcode.QR_CODE).build();

        Frame myFrame = new Frame.Builder()
                .setBitmap(myQRCode)
                .build();

        SparseArray<Barcode> barcodes = barcodeDetector.detect(myFrame);

        if (barcodes.size() != 0) {

            Log.d("My QR Code's Data",
                    barcodes.valueAt(0).displayValue
            );
        }

        SurfaceView cameraView = findViewById(R.id.camera_view);
        TextView barcodeInfo = findViewById(R.id.code_info);

        barcodeDetector =
                new BarcodeDetector.Builder(this)
                        .setBarcodeFormats(Barcode.QR_CODE)
                        .build();

        CameraSource cameraSource = new CameraSource
                .Builder(this, barcodeDetector)
                .setRequestedPreviewSize(640, 480)
                .build();


        cameraView.getHolder().addCallback(new SurfaceHolder.Callback() {

            @Override
            public void surfaceCreated(SurfaceHolder holder) {

                try {

                    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                        // TODO: Consider calling
                        //    ActivityCompat#requestPermissions
                        // here to request the missing permissions, and then overriding
                        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                        //                                          int[] grantResults)
                        // to handle the case where the user grants the permission. See the documentation
                        // for ActivityCompat#requestPermissions for more details.
                        return;
                    }

                    cameraSource.start(cameraView.getHolder()); // cameraSource shall declared to be final

                } catch (IOException ie) {
                    Log.e("CAMERA SOURCE", ie.getMessage());
                }

            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                cameraSource.stop(); // cameraSource shall declared to be final
            }

        });


        barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {

            @Override
            public void release() {
            }

            @Override
            public void receiveDetections(Detector.Detections<Barcode> detections) {

                final SparseArray<Barcode> barcodes = detections.getDetectedItems();

                if (barcodes.size() != 0) {
                    // 因为receiveDetections在非UI线程中执行
                    barcodeInfo.post(new Runnable() { //barcodeInfo needs to be declared final
                        public void run() {
                            barcodeInfo.setText( //barcodeInfo needs to be declared final
                                    barcodes.valueAt(0).displayValue
                            );
                        }
                    });
                }

            }
        });






    }//on crate


}