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Android QR Code Events

  1. Scan this QR Code..
  2. Generate QR Code in Android
  3. Scan or Read QR Code in Android

Note                     Download ADT Plugin Here.
Here I am using,
OS : Linux (Ubuntu 12.04)
Eclipse : Juno (Version 4.2.0)
Android API Level : 3 to 'n' as per need
Emulator API Level : It will be displayed in output image 

A. Scan this QR Code..


Output


B. Generate QR Code in Android

Note : In Android Market many Apps available for QR Code Events. Here I am using QR Droid. Install QR Droid Application in your Device.

Step 1 : Select File -> New -> Project -> Android Application Project (or) Android Project. Fill the forms and click "Finish" button. If you have any doubt regarding create a new project Click Here.

Step 2 : Open res -> layout -> activity_main.xml (or) main.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
 
    <TextView
        android:id="@+id/textView1"
        android:textColor="#4169E1"
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:text="QR Code Generator" />
 
    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:inputType="textMultiLine" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:text="Generate" />
    
    <ImageView
 android:id="@+id/img_result"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
 android:visibility="gone" />
 
</RelativeLayout>

Step 3 : Open src -> package -> MainActivity.java and add following code :

package balaji.qrcode_generate;
 
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
 
public class MainActivity extends Activity {
 
 private static final int ACTIVITY_RESULT_QR_DRDROID = 0;
 
 Button generate;
 EditText edit;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  generate = (Button) findViewById(R.id.button1);
  edit = (EditText) findViewById(R.id.editText1);
  
  generate.setOnClickListener(new View.OnClickListener() {
   
   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    
    String code = edit.getText().toString();
    
    if(code.trim().length() == 0) {
     
     Toast.makeText(getBaseContext(), 
      "Enter Text", Toast.LENGTH_SHORT ).show();
     return;
    }
    
    Intent encode = new Intent("la.droid.qr.encode"); 
    encode.putExtra("la.droid.qr.code", code);   
    encode.putExtra("la.droid.qr.image", true);
    encode.putExtra("la.droid.qr.size", 0);
        
    try {
     
     startActivityForResult(encode, ACTIVITY_RESULT_QR_DRDROID);
    }
    catch (ActivityNotFoundException activity) {
     
     qrDroidRequired(MainActivity.this);
    }
   }
  });
 }
 
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  super.onActivityResult(requestCode, resultCode, data);
  
  if(ACTIVITY_RESULT_QR_DRDROID == requestCode 
    && data != null && data.getExtras() != null ) {
   
   ImageView imgResult = ( ImageView ) findViewById(R.id.img_result);
       
   String qrCode = data.getExtras().getString("la.droid.qr.result");
    
   if(qrCode == null || qrCode.trim().length() == 0) {
     
    Toast.makeText(getBaseContext(), "QR Code Image " +
     "is not Saved", Toast.LENGTH_LONG).show();
    return;
   }
    
   Toast.makeText(getBaseContext(), "QR Code Image is Saved" 
    + " " + qrCode, Toast.LENGTH_LONG).show();
    
   imgResult.setImageURI( Uri.parse(qrCode) );
    
   imgResult.setVisibility( View.VISIBLE );   
  }
 } 
 
 /* 
  * 
  * If we don't have QRDroid Application in our Device, 
  * It will call below method (qrDroidRequired)
  * 
  */
 
 protected static void qrDroidRequired(final MainActivity activity) {
  // TODO Auto-generated method stub
  
  AlertDialog.Builder AlertBox = new AlertDialog.Builder(activity);
  
  AlertBox.setMessage("QRDroid Missing");
  
  AlertBox.setPositiveButton("Direct Download", new OnClickListener() {
   
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
    
    activity.startActivity(new Intent(Intent.ACTION_VIEW, 
     Uri.parse("http://droid.la/apk/qr/")));
   }
  });
  
  AlertBox.setNeutralButton("From Market", new OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    
    activity.startActivity(new Intent(Intent.ACTION_VIEW, 
     Uri.parse("http://market.android.com/details?id=la.droid.qr")));
   }
  });
  
  AlertBox.setNegativeButton("Cancel", new OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    
    dialog.cancel();
   }
  });
  
  AlertBox.create().show();
 }
 
 @Override
    public void onConfigurationChanged(Configuration newConfig) {
     super.onConfigurationChanged(newConfig);
     //Nothing
    }
}

Step 4 : Open AndroidManifest.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="balaji.qrcode_generate"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="3"
        android:targetSdkVersion="17" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="balaji.qrcode_generate.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>
    </application>
 
</manifest>

Step 5 : Open res ->values ->strings.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <string name="app_name">QRCode_Generate</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
 
</resources>

Step 6 : Our output will be like this :


Output

Run this Program in Real Device







C. Scan or Read QR Code in Android

Note : In Android Market many Apps available for QR Code Events. Here I am using QR Droid. Install QR Droid Application in your Device.

Step 1 : Select File -> New -> Project -> Android Application Project (or) Android Project. Fill the forms and click "Finish" button. If you have any doubt regarding create a new project Click Here.

Step 2 : Open res -> layout -> activity_main.xml (or) main.xml and add following code :

<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"
    tools:context=".MainActivity" >
 
    <TextView
        android:id="@+id/textView1"
        android:textSize="20sp"
        android:textColor="#4169E1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:text="QR Code Scanner" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:text="Scan" />
 
    <TextView
        android:id="@+id/textView2"
        android:textSize="18sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Scan Report" />
 
</RelativeLayout>

Step 3 : Open src -> package -> MainActivity.java and add following code :

package balaji.qrcode_scan;
 
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
 private static final int ACTIVITY_RESULT_QR_DRDROID = 0;
 
 TextView report;
 Button scan;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  report = (TextView) findViewById(R.id.textView2);
  scan = (Button) findViewById(R.id.button1);
  
  scan.setOnClickListener(new View.OnClickListener() {
   
   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    
    Intent i = new Intent("la.droid.qr.scan");
    
    try {
     
     startActivityForResult(i, ACTIVITY_RESULT_QR_DRDROID);
    } 
    catch (ActivityNotFoundException activity) {
     
     MainActivity.qrDroidRequired(MainActivity.this);
    }
   }
  });
 } 
 
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  super.onActivityResult(requestCode, resultCode, data);
  
  if( ACTIVITY_RESULT_QR_DRDROID == requestCode 
    && data != null && data.getExtras() != null ) {
   
   String result = data.getExtras().getString("la.droid.qr.result");
   
   report.setText(result);
   report.setVisibility(View.VISIBLE);
  }
 }
 
 /* 
  * 
  * If we don't have QRDroid Application in our Device, 
  * It will call below method (qrDroidRequired)
  * 
  */
 
 protected static void qrDroidRequired(final MainActivity activity) {
  // TODO Auto-generated method stub
  
  AlertDialog.Builder AlertBox = new AlertDialog.Builder(activity);
  
  AlertBox.setMessage("QRDroid Missing");
  
  AlertBox.setPositiveButton("Direct Download", new OnClickListener() {
   
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
    
    activity.startActivity(new Intent(Intent.ACTION_VIEW, 
     Uri.parse("http://droid.la/apk/qr/")));
   }
  });
  
  AlertBox.setNeutralButton("From Market", new OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    
    activity.startActivity(new Intent(Intent.ACTION_VIEW, 
     Uri.parse("http://market.android.com/details?id=la.droid.qr")));
   }
  });
  
  AlertBox.setNegativeButton("Cancel", new OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    
    dialog.cancel();
   }
  });
  
  AlertBox.create().show();
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.activity_main, menu);
  return true;
 }
}

Step 4 : Open AndroidManifest.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="balaji.qrcode_scan"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="3"
        android:targetSdkVersion="17" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="balaji.qrcode_scan.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>
    </application>
 
</manifest>

Step 5 : Open res ->values ->strings.xml and add following code :

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <string name="app_name">QRCode_Scan</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
 
</resources>

Step 6 : Our output will be like this :


Output

Run this Program in Real Device
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