Bar Code Example in Android

Step 1 : 

Download Zxing Library for barcode and Add it to your project.

Step 2 : activity_main.xml

<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" >

    <Button
        android:id="@+id/scan_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="54dp"
        android:text="Button" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="42dp"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

Step 3 :  MainActivity.java

package com.rajeshvijayakumar.barcode;

public class MainActivity extends Activity implements OnClickListener {

    private ZXingLibConfig zxingLibConfig;
    private Button mScanBarCodeButton;
    private TextView mSummaryView;
    private String result;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mScanBarCodeButton = (Button) findViewById(R.id.scan_button);
        mSummaryView = (TextView) findViewById(R.id.textView1);
        mScanBarCodeButton.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        switch (view.getId()) {
        case R.id.scan_button:
            IntentIntegrator.initiateScan(MainActivity.this, zxingLibConfig);
            break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
        case IntentIntegrator.REQUEST_CODE:
            IntentResult scanResult = IntentIntegrator.parseActivityResult(
                    requestCode, resultCode, data);
            if (scanResult != null) {
                result = scanResult.getContents();// scanned result
                mSummaryView.setText("Scanned Barcode : "+ result);
                } else {
                    // DO Something
                }
            break;
        default:
        }
    }
}

 Step 4: Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.rajeshvijayakumar.barcode"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="7"
        android:targetSdkVersion="19" />

    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.rajeshvijayakumar.barcode.MainActivity"
            android:screenOrientation="landscape"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="jim.h.common.android.lib.zxing.CaptureActivity"
            android:configChanges="orientation|keyboardHidden"
            android:screenOrientation="landscape"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" />
    </application>

</manifest>

Expected Output :

GitHub: https://github.com/rajeshmcashc10/rajeshvijayakumar-android/tree/master/barcode-example