Today’s special

Imgur

Overview

We first used Zxing Library to implement this. Furthermore, there is also another way to implement this - by using Google’s Mobile Vision APIs - Barcode Detection in Google Play services. We ended up using ZXing Android Embedded since it not only suppots camera in vertical mode but also is more lighter than Zxing.

Steps

1. Create a New Android Project.

Let’s call the Application Name: BardcodeScanningApp. Choose a blank activity.

Add one Button, two TextView in your main layout file, under the default 

<Button
    android:id="@+id/scan_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:text="@string/scan"
    android:onClick="sendBarcode"/>

<TextView
    android:id="@+id/scan_format"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textIsSelectable="true"
    android:layout_centerHorizontal="true"
    android:layout_below="@id/scan_button" />

<TextView
    android:id="@+id/scan_content"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textIsSelectable="true"
    android:layout_centerHorizontal="true"
    android:layout_below="@id/scan_format"/>

Looks like below, android:onClick="sendBarcode" is for adding sendBarcode() in the main activity code.

CodeImg

2. Add ZXing to Your Project.

Add the following to your build.gradle file:

repositories {
    mavenCentral()

    maven {
        url "http://dl.bintray.com/journeyapps/maven"
    }
}

dependencies {
    // Supports Android 4.0.3 and later (API level 15)
    compile 'com.journeyapps:zxing-android-embedded:2.0.1@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:2.0.1@aar'

    // Convenience library to launch the scanning and encoding 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:2.0.1@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:3.0.1'
}

3. Do Some Scanning.

In app’s main activity class, above onCreate() method, add variables to represent the button and two Textviews we created in the layout file.

private Button scanBtn;
private TextView formatTxt, contentTxt;

In onCreate(), after the existing code, instantiate these variables using the ID values we specified in the XML.

scanBtn = (Button)findViewById(R.id.scan_button);
formatTxt = (TextView)findViewById(R.id.scan_format);
contentTxt = (TextView)findViewById(R.id.scan_content);

Now, create a sendBarcode() method.

    public void sendBarcode(View view){
        if ( view == scanBtn ){
            IntentIntegrator scanIntegrator = new IntentIntegrator(this);

            //scanning
            scanIntegrator.initiateScan();
        }
    }

At this point, the scanner will start. When you call the initiateScan method, you can choose to pass a collection of the barcode types you want to scan. By default, the method will scan for all supported types. These include UPC-A, UPC-E, EAN-8, EAN-13, QR Code, RSS-14, RSS Expanded, Data Matrix, Aztec, PDF 417, Codabar, ITF, Codes 39, 93, and 128.

4. Retrieve Scanning Results.

When the user clicks the scan button, the barcode scanner will launch. When they scan a barcode, it will return the scanned data to the onActivityResult method of the calling activity. Add the method to your main activity class.

public void onActivityResult(int requestCode, int resultCode, Intent intent){
    //retrieve scan result
    IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);

    if ( null != scanningResult ){
        //we have a result
        String scanContent = scanningResult.getContents();
        String scanFormat = scanningResult.getFormatName();

        formatTxt.setText("FORMAT: " + scanFormat);
        contentTxt.setText("CONTENT: " + scanContent);
    } else {
        Toast toast = Toast.makeText(getApplicationContext(), "No scan data received!", Toast.LENGTH_SHORT);
        toast.show();
    }
}

Results

Imgur1 Imgur2 Imgur3

Use Google’s Barcode Scanner API

After following with this example, I pretty much do not like the way to use their API. Therefore, I intend to pass it.

Zxing Camera in Portrait Mode

Many suggested solutions refered below:

But I found another library called ZXing Android Embedded, which is based on Zxing but more lighter than the original one.

ZXing Android Embedded

Features:

  • Can be used via Intents (little code required).
  • Can be embedded in an Activity, for advanced customization of UI and logic.
  • Scanning can be performed in landscape or portrait mode.
  • Camera is managed in a background thread, for fast startup time.

1. Create a New Android Project.

Change the layout file activity_main.xml like this:

<ScrollView 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"
    tools:context="com.example.elsalin.barcodescanner_zxing_embed.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/scan_barcode"
            android:onClick="scanBarcode"/>
    </LinearLayout>

</ScrollView>

2. Adding aar dependency with Gradle.

Add the following to your build.gradle file:

repositories {
    jcenter()
}

dependencies {
    compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
    compile 'com.google.zxing:core:3.2.1'
    compile 'com.android.support:appcompat-v7:23.1.0'   // Version 23+ is required
}

android {
    buildToolsVersion '23.0.2' // Older versions may give compile errors
}

3. Usage with IntentIntegrator.

Add scanBarcode() function under onCreate() funtion.

    public void scanBarcode(View view) {
        new IntentIntegrator(this).initiateScan();  // `this` is the current Activity
    }

To get the results, add:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
    if(result != null) {
        if(result.getContents() == null) {
            Toast.makeText(this, "Cancelled", Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(this, "Scanned: " + result.getContents(), Toast.LENGTH_LONG).show();
        }
    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}

4. Changing the orientation.

To change the orientation, specify the orientation in your AndroidManifest.xml and let the ManifestMerger to update the Activity’s definition.

<activity
        android:name="com.journeyapps.barcodescanner.CaptureActivity"
        android:screenOrientation="fullSensor"
        tools:replace="screenOrientation" />

IntentIntegrator integrator = new IntentIntegrator(this);
integrator.setOrientationLocked(false);
integrator.initiateScan();

Results

Imgur4 Imgur5

Reference

Android SDK: Create a Barcode Reader
如何在Android Studio中加入library??