QR Code Scanner Example For Android Students

hi friends i am going to write my new post on Qr scanner. as we all know Qr code is really important
and safe way to transfer data from one device to other. here i am going to tell you how to scan Qr code Tags with android phone

Requirement :

1. Android Studio
2.Android mobile
3.Android SDK
4.mind

So to make it easy we follow these step.

1 . Add dependencies in build.gradle file


 dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'  


compile 'com.android.support:appcompat-v7:23.4.0'  

compile 'me.dm7.barcodescanner:zxing:1.8.4'


}



2.XML file for Scanner

 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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:orientation="vertical"

    android:layout_gravity="center"

    android:gravity="center"

    tools:context="com.rgg.rahulgoswami.qrscanner.MainActivity">

    <TextView      

        android:layout_width="wrap_content"      

        android:layout_height="wrap_content"      

        android:text="QR CODE SCANNER AND GENERATOR"

        android:id="@+id/textView"

        android:textSize="20sp"

        android:gravity="center"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true" />



    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Generate QR"

       android:id="@+id/button"

        android:layout_marginTop="40dp"

        android:layout_gravity="center"

        android:layout_above="@+id/textView2"

        android:layout_alignEnd="@+id/imageView" />



    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Scan QR"

        android:id="@+id/button2"

        android:layout_marginTop="20dp"

        android:layout_gravity="center"

        android:layout_alignTop="@+id/button"

        android:layout_toStartOf="@+id/button" />


    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="By Perfect RG"

        android:id="@+id/textView2"

        android:layout_margin="40dp"

        android:layout_gravity="center"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true" />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textAppearance="?android:attr/textAppearanceSmall"

        android:text="prfectrg.blogspot.com"

        android:id="@+id/textView3"

        android:layout_gravity="center_horizontal" />


</LinearLayout>



3. Now Write Java Code In your MainActivity.java



import this class in your activity



import me.dm7.barcodescanner.zxing.ZXingScannerView;




4. Add This code For Scan


 mScannerView = new ZXingScannerView(this);


 // Programmatically initialize the scanner view      

setContentView(mScannerView);
        mScannerView.setResultHandler(this);

// Register ourselves as a handler for scan results.      

mScannerView.startCamera();
    }

    @Override    public void onPause() {
        super.onPause();
        mScannerView.stopCamera();        

// Stop camera on pause    }
    @Override    public void handleResult(Result result) {
        // Do something with the result here    

 Toast.makeText(MainActivity.this,"This is your Text"+result.getText(),Toast.LENGTH_SHORT);
        Log.e("handler", result.getText());

// Prints scan results      

Log.e("handler", result.getBarcodeFormat().toString());

// Prints the scan format (qrcode)

 }




Complete Code





package com.rgg.rahulgoswami.qrscanner;

import android.content.Intent;
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.Toast;

import com.google.zxing.Result;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

public class MainActivity extends AppCompatActivity implements





 View.OnClickListener, ZXingScannerView.ResultHandler {
    private ZXingScannerView mScannerView;
    Button scancode,generatecode;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        scancode=(Button)findViewById(R.id.button2);
        generatecode=(Button)findViewById(R.id.button);

        mScannerView = new ZXingScannerView(MainActivity.this);
        generatecode.setOnClickListener(this);
        scancode.setOnClickListener(this);
    }

    @Override    public void onClick(View v) {

        if (v==generatecode)
        {
            Intent i=new Intent(MainActivity.this,QRCodeActivity.class);
            startActivity(i);
        }
        if(v==scancode)
        {
            ScanCode();
        }
    }

    private void ScanCode() {

        mScannerView = new ZXingScannerView(this);


 // Programmatically initialize the scanner view      


setContentView(mScannerView);

        mScannerView.setResultHandler(this);


// Register ourselves as a handler for scan results.      


mScannerView.startCamera();
    }

    @Override    public void onPause() {
        super.onPause();
        mScannerView.stopCamera();        


// Stop camera on pause    }

    @Override    public void handleResult(Result result) {
        // Do something with the result here    


 Toast.makeText(MainActivity.this,"This is your Text"+result.getText(),Toast.LENGTH_SHORT);
        Log.e("handler", result.getText());


// Prints scan results        Log.e("handler", result.getBarcodeFormat().toString());


// Prints the scan format (qrcode)


 }
}





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

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

    package="com.rgg.rahulgoswami.qrscanner">
    <uses-permission android:name="android.permission.CAMERA"/>
    <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>
        <activity android:name=".QRCodeActivity"></activity>
    </application>

</manifest>