NEXT GENERATION ANDROID: Generating Facebook Key Hash

package com.ram.facebookkeyhash;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import com.ram.demo1.R;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;

public class MainActivity extends Activity
{
   // Declare your application package name
   String packageName = "your application package name";

   @Override
   protected void onCreate(Bundle savedInstanceState)
   {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       try
       {
           // Overall information about the contents of a package. This
           // corresponds to all of the information collected from
           // AndroidManifest.xml.
           PackageInfo packageInfo = getPackageManager().getPackageInfo(packageName,
                   PackageManager.GET_SIGNATURES);

           // Array of all signatures read from the package file. This is only
           // filled in if the flag GET_SIGNATURES was set.
           for (Signature signature : packageInfo.signatures)
           {
               // The basic pattern to digest an InputStream
               MessageDigest md = MessageDigest.getInstance("SHA");
               // The basic pattern to digest an InputStream
               md.update(signature.toByteArray());
               // Prints key hash in logcat
               Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
           }

       } catch (NameNotFoundException e)
       {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (NoSuchAlgorithmException e)
       {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }
}

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Generating Facebook Key Hash

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