Skip to main content

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
Labels:

Comments

Post a Comment

Popular posts from this blog

web2apk

http://web2apk.com/create.aspx Create App   Intro   About   Changes   MalWare ?   Contact   Privacy Useful Links Bluetooth Mini Keyboards Android Mini PC Reset Android URL App Title Icon or
Post a Comment
Read more

Android Bar Chart Using MpAndroidChart Library Tutorial

https://www.numetriclabz.com/android-bar-chart-using-mpandroidchart-library-tutorial/ Android Bar Chart Using MpAndroidChart Library Tutorial Objective In this tutorial we learn how to implement Bar Chart using MpAndroidChart Library in your Android App. Download Source Code       Step 1 Contents ·        1  Introduction ·        2  Creating Bar chart o    2.1  Create a new Project o    2.2  Adding library in Project o    2.3  Create Layout o    2.4  To Plot Bar Chart §   2.4.1  Initialize the graph id §   2.4.2  Creating a Dataset §   2.4.3  Defining X-axis labels §   2.4.4  Set the data §   2.4.5  Add the description to the chart §   2.4.6  Run your App §   2.4.7  Set the color §   2.4.8  Adding Animations o    2.5  To plot grouped bar chart §   2.5.1  Creating Dataset o    2.6  Get the best of Android plus exclusive deals and freebies in your inbox!
2 comments
Read more

how to retrieve image from sqlite database in android and display in listview

 Android platform provides several ways to store data in our application. 1. SQLite database 2. SharedPreferences etc For our post, we will only work with SQLite database. First and foremost, we need to understand what an SQLite database is? SQLite database  is an open source SQL database that stores data to a text file on a device. It executes SQL Commands to perform a set of functions, that is, create, read, update and delete operations. On my previous post, I showed how to  store data in SQLite database from edit text, retrieve and populate it in a listview . For this post, I will show the SQLite CRUD operations with images from gallery and text from EditText. We need to understand this; images are stored in SQLite database as BLOB data type. A BLOB is a large binary object that can hold a variable amount of data.  Note, we can only store images in the database as BLOB data type. We need to convert our image path to a bitmap then to bytes. Also
1 comment
Read more