zxing - QRCode, Barcode

1. build.gradle (Module: app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.falcon.myqrcode"
        minSdkVersion 19
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'

 // Supports Android 4.0.3 and later (API level 15)
    compile 'com.journeyapps:zxing-android-embedded:2.3.0@aar'

    // Supports Android 2.1 and later (API level 7), but not optimal for later Android versions.
    // If you only plan on supporting Android 4.0.3 and up, you don't need to include this.
    compile 'com.journeyapps:zxing-android-legacy:2.3.0@aar'

    // Convenience library to launch the scanning Activities.
    // It automatically picks the best scanning library from the above two, depending on the
    // Android version and what is available.
    compile 'com.journeyapps:zxing-android-integration:2.3.0@aar'

    // Version 3.0.x of zxing core contains some code that is not compatible on Android 2.2 and earlier.
    // This mostly affects encoding, but you should test if you plan to support these versions.
    // Older versions e.g. 2.2 may also work if you need support for older Android versions.
    compile 'com.google.zxing:core:3.2.0'
}

2. AndroidManifest.xml

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

    <uses-feature android:name="android.hardware.camera"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.FLASHLIGHT"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>

3. MainActivity.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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.falcon.myqrcode.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="바코드정보"
        android:id="@+id/mResult"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="52dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="읽기"
        android:id="@+id/btnRead"
        android:layout_below="@+id/mResult"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="99dp" />
</RelativeLayout>

4. MainActivity.java

package com.example.falcon.myqrcode;

import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

public class MainActivity extends AppCompatActivity {

    TextView mResult;
    Button mReadBtn;

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

        mReadBtn = (Button) findViewById(R.id.btnRead);
        mResult = (TextView) findViewById(R.id.mResult);

        mReadBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mResult.setText("");

                IntentIntegrator integrator = new IntentIntegrator(MainActivity.this);
                integrator.setOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                integrator.addExtra("PROMPT_MESSAGE", "상품코드를 사각형 안에 비춰주세요.");
                integrator.initiateScan();
            }
        });

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        mResult.setText(result.getContents());

        // result.getFormatName() : 바코드 종류
        // result.getContents() : 바코드 값

        Toast.makeText(getApplicationContext(),"contents: "+result.getFormatName(), Toast.LENGTH_LONG).show();

/*
        if(requestCode == 0) {

            if(resultCode == Activity.RESULT_OK)
            {
                String contents = data.getStringExtra("SCAN_RESULT");
                //위의 contents 값에 scan result가 들어온다.
                Toast.makeText(this,contents,Toast.LENGTH_LONG).show();
                mResult.setText(contents+"&imei=");
            }

        }
*/

    }
}