Android: อ่าน QR Code | Phaisarn Sutheebanjard

Contents

1build.gradle (Module: app)
2AndroidManifest.xml
3activity_main.xml
4MainActivity.java

อ่าน QR Code ด้วยไลบรารี่ zxing

build.gradle (Module: app)

dependencies {
    ...
 
    implementation 'com.google.zxing:core:3.2.1'
    implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
}

dependencies {

...

implementation 'com.google.zxing:core:3.2.1'

implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'

}

AndroidManifest.xml

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

    <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>

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.phaisarn.jackapplication">

<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">

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

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=".MainActivity">

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

<?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=".MainActivity">

<SurfaceView

android:id="@+id/surfaceView"

android:layout_width="match_parent"

android:layout_height="match_parent" />

</LinearLayout>

MainActivity.java

package com.phaisarn.jackapplication;

import android.Manifest;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.app.AlertDialog;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PreviewCallback;
import android.os.Build;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View.OnClickListener;

import java.util.ArrayList;
import java.util.List;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.FormatException;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.Reader;
import com.google.zxing.Result;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, AutoFocusCallback {

    public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 1;

    private Context mContext;
    private SurfaceView mSurfaceView;
    private Camera mCamera;
    private AlertDialog mDialog;

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

        checkAndRequestPermissions();

        mContext = getApplicationContext();

        mSurfaceView = findViewById(R.id.surfaceView);
        mSurfaceView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mCamera != null) {
                    mCamera.autoFocus(MainActivity.this);
                }
            }
        });

        mDialog = new AlertDialog.Builder(MainActivity.this)
                .setCancelable(false)
                .setPositiveButton("Yes", null).create();
    }

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

        SurfaceHolder surfaceHolder = mSurfaceView.getHolder();
        surfaceHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        // Camera Open
        mCamera = Camera.open();
        mCamera.setDisplayOrientation(90);
        try {
            mCamera.setPreviewDisplay(surfaceHolder);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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

        mCamera.setPreviewCallback(_previewCallback);

        Camera.Parameters parameters = mCamera.getParameters();
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
        } else {
            parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
        }

        List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
        Camera.Size previewSize = previewSizes.get(0);
        parameters.setPreviewSize(previewSize.width, previewSize.height);

        mCamera.setParameters(parameters);
        mCamera.startPreview();
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.setPreviewCallback(null);
        mCamera.release();
        mCamera = null;
    }

    @Override
    public void onAutoFocus(boolean success, Camera camera) {
    }

    private PreviewCallback _previewCallback = new PreviewCallback() {
        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {

            Log.d("onPreviewFrame", "onPreviewFrame Called");

            if (mDialog.isShowing()) return;

            // Read Range
            Camera.Size size = camera.getParameters().getPreviewSize();

            // Create BinaryBitmap
            PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
                    data, size.width, size.height, 0, 0, size.width, size.height, false);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            // Read QR Code
            Reader reader = new MultiFormatReader();
            Result result = null;
            try {
                result = reader.decode(bitmap);
                String text = result.getText();

                mDialog.setMessage(text);
                mDialog.show();

            } catch (NotFoundException e) {
            } catch (ChecksumException e) {
            } catch (FormatException e) {
            }
        }
    };

    private boolean checkAndRequestPermissions() {
        int camera = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA);

        List<String> listPermissions = new ArrayList<>();
        if (camera != PackageManager.PERMISSION_GRANTED) {
            listPermissions.add(Manifest.permission.CAMERA);
        }

        if (!listPermissions.isEmpty()) {
            ActivityCompat.requestPermissions(this, listPermissions.toArray(new String[listPermissions.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);
            return false;
        }

        return true;
    }
}

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package com.phaisarn.jackapplication;

import android.Manifest;

import android.content.pm.PackageManager;

import android.support.v4.app.ActivityCompat;

import android.support.v4.content.ContextCompat;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.app.AlertDialog;

import android.content.Context;

import android.hardware.Camera;

import android.hardware.Camera.AutoFocusCallback;

import android.hardware.Camera.PreviewCallback;

import android.os.Build;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.view.View.OnClickListener;

import java.util.ArrayList;

import java.util.List;

import com.google.zxing.BinaryBitmap;

import com.google.zxing.ChecksumException;

import com.google.zxing.FormatException;

import com.google.zxing.MultiFormatReader;

import com.google.zxing.NotFoundException;

import com.google.zxing.PlanarYUVLuminanceSource;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.Reader;

import com.google.zxing.Result;

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, AutoFocusCallback {

public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 1;

private Context mContext;

private SurfaceView mSurfaceView;

private Camera mCamera;

private AlertDialog mDialog;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

checkAndRequestPermissions();

mContext = getApplicationContext();

mSurfaceView = findViewById(R.id.surfaceView);

mSurfaceView.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

if (mCamera != null) {

mCamera.autoFocus(MainActivity.this);

}

});

mDialog = new AlertDialog.Builder(MainActivity.this)

.setCancelable(false)

.setPositiveButton("Yes", null).create();

}

@Override

protected void onResume() {

super.onResume();

SurfaceHolder surfaceHolder = mSurfaceView.getHolder();

surfaceHolder.addCallback(this);

}

@Override

public void surfaceCreated(SurfaceHolder surfaceHolder) {

// Camera Open

mCamera = Camera.open();

mCamera.setDisplayOrientation(90);

try {

mCamera.setPreviewDisplay(surfaceHolder);

} catch (Exception e) {

e.printStackTrace();

}

@Override

public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {

mCamera.setPreviewCallback(_previewCallback);

Camera.Parameters parameters = mCamera.getParameters();

if (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH) {

parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);

} else {

parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);

}

List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();

Camera.Size previewSize = previewSizes.get(0);

parameters.setPreviewSize(previewSize.width, previewSize.height);

mCamera.setParameters(parameters);

mCamera.startPreview();

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

mCamera.setPreviewCallback(null);

mCamera.release();

mCamera = null;

}

@Override

public void onAutoFocus(boolean success, Camera camera) {

}

private PreviewCallback _previewCallback = new PreviewCallback() {

@Override

public void onPreviewFrame(byte[] data, Camera camera) {

Log.d("onPreviewFrame", "onPreviewFrame Called");

if (mDialog.isShowing()) return;

// Read Range

Camera.Size size = camera.getParameters().getPreviewSize();

// Create BinaryBitmap

PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(

data, size.width, size.height, 0, 0, size.width, size.height, false);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

// Read QR Code

Reader reader = new MultiFormatReader();

Result result = null;

try {

result = reader.decode(bitmap);

String text = result.getText();

mDialog.setMessage(text);

mDialog.show();

} catch (NotFoundException e) {

} catch (ChecksumException e) {

} catch (FormatException e) {

}

};

private boolean checkAndRequestPermissions() {

int camera = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA);

List<String> listPermissions = new ArrayList<>();

if (camera != PackageManager.PERMISSION_GRANTED) {

listPermissions.add(Manifest.permission.CAMERA);

}

if (!listPermissions.isEmpty()) {

ActivityCompat.requestPermissions(this, listPermissions.toArray(new String[listPermissions.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);

return false;

}

return true;

}

บรรทัดที่ 56-58: กำหนดให้ autoFocus()
บรรทัดที่ 62-64: เตรียมไดอะล็อกไว้แสดง
บรรทัดที่ 79: เอียงภาพ 90 องศา
บรรทัดที่ 130-132: บันทึกภาพเตรียมไว้ให้อ่าน
บรรทัดที่ 135-147: อ่านค่า QR Code
บรรทัดที่ 151-165: ขอ Permission

Link

wasabeef/zxingQRCodeSample.java