Barcode scanning on android

Implement Barcode scanning on android in only 12 steps.

1.   Creating new project
File -> New -> Android project -> Then Press finish button

2.   it will create  project hierarchy given below

3.  Create Layout File

• activity_main.xml layout file name

<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=".MainActivity" >
    <Button
        android:id="@+id/startScanning"
        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:minHeight="70dp"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:onClick="onStartBrScan"        android:layout_marginTop="60dp"        android:text="Start Barcode Scan" />
    <TextView
        android:id="@+id/scannedbr"
        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>

4.   Implement call back methods and add  REQUEST_CODE_BARCODE = 3000.

package com.example.barcodescanner;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

public class MainActivity extends Activity {

/*

     * Add this line in the activity which will initiate barcode to scanner

       */

private final int REQUEST_CODE_BARCODE = 3000;

private TextView mBCScanTxt;

  @Override

        protected void onCreate(Bundle savedInstanceState) {

               super.onCreate(savedInstanceState);

               setContentView(R.layout.activity_main);

               mBCScanTxt = (TextView)findViewById(R.id.scannedbr);

        }

public void onStartBrScan(View view){

}

}


5.  Download this project and add it as a library project. Right click on project select properties-> android-> scroll down -> press add button -> select "com.jwetherell.quick_response_code.CaptureActivity".

6.  Library will be added to your project now as below.

 7.   Come back to your project,and modify onStartScan callback method as below.

public void onStartBrScan(View view){
startActivityForResult(new Intent(MainActivity.this,
DecoderActivity.class), REQUEST_CODE_BARCODE);
}

8.    Add onactivityresult method.

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

// TODO Auto-generated method stub

super.onActivityResult(requestCode, resultCode, data);

if (data != null) {

switch (requestCode) {

case REQUEST_CODE_BARCODE:

mBCScanTxt.setText(data.getExtras().getString("ISBN"));

break;

default:

break;

}

}

}

9.    Add camera permission  to the AndroidManifest.xml

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

10.    Add the below activity in the AndroidManifest.xml file under the application tag.Modified AndroidManifest.xml is given below.

       <activity
            android:name="com.jwetherell.quick_response_code.CaptureActivity"
            android:clearTaskOnLaunch="true"            android:configChanges="orientation|keyboardHidden"
            android:icon="@drawable/icon"
            android:label="@string/capture_name"
            android:screenOrientation="landscape"            android:stateNotNeeded="true"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" >        </activity>        <activity            android:name="com.jwetherell.quick_response_code.DecoderActivity"
            android:clearTaskOnLaunch="true"            android:configChanges="orientation|keyboardHidden"
            android:icon="@drawable/icon"
            android:label="@string/decoder_name"
            android:screenOrientation="landscape"            android:stateNotNeeded="true"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" >        </activity>        <activity            android:name="com.jwetherell.quick_response_code..EncoderActivity"
            android:clearTaskOnLaunch="true"            android:configChanges="orientation|keyboardHidden"
            android:icon="@drawable/icon"
            android:label="@string/encoder_name"
            android:screenOrientation="landscape"            android:stateNotNeeded="true"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" >        </activity>

11.    Modified AndroidManifest.xml is given below.

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.barcodescanner"
    android:versionCode="1"    android:versionName="1.0" >  
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" />
    <application
        android:allowBackup="true"        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >      
        <activity            android:name="com.example.barcodescanner.MainActivity"
            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="com.jwetherell.quick_response_code.CaptureActivity"
            android:clearTaskOnLaunch="true"            android:configChanges="orientation|keyboardHidden"
            android:icon="@drawable/icon"
            android:label="@string/capture_name"
            android:screenOrientation="landscape"            android:stateNotNeeded="true"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" >        </activity>        <activity            android:name="com.jwetherell.quick_response_code.DecoderActivity"
            android:clearTaskOnLaunch="true"            android:configChanges="orientation|keyboardHidden"
            android:icon="@drawable/icon"
            android:label="@string/decoder_name"
            android:screenOrientation="landscape"            android:stateNotNeeded="true"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" >        </activity>        <activity            android:name="com.jwetherell.quick_response_code..EncoderActivity"
            android:clearTaskOnLaunch="true"            android:configChanges="orientation|keyboardHidden"
            android:icon="@drawable/icon"
            android:label="@string/encoder_name"
            android:screenOrientation="landscape"            android:stateNotNeeded="true"            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:windowSoftInputMode="stateAlwaysHidden" >        </activity>    </application>
</manifest>

12.   Congrates :) You are done now .

                SourceCode