Utils.java

package com.rava.voting.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import retrofit.RetrofitError;
import retrofit.client.Response;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.graphics.Bitmap;
import android.util.Base64;
import android.util.Log;
import android.view.ViewGroup;
import android.widget.Toast;

public class Utils {
	/**
	 * Take screenshot of the activity including the action bar
	 * 
	 * @param activity
	 * @return The screenshot of the activity including the action bar
	 */
	public static Bitmap takeScreenshot(Activity activity) {
		ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
		ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
		decorChild.setDrawingCacheEnabled(true);
		decorChild.buildDrawingCache();
		Bitmap drawingCache = decorChild.getDrawingCache(true);
		Bitmap bitmap = Bitmap.createBitmap(drawingCache);
		decorChild.setDrawingCacheEnabled(false);
		return bitmap;
	}

	/**
	 * Print hash key
	 */
	public static void printHashKey(Context context) {
		try {
			String TAG = "com.sromku.simple.fb.example";
			PackageInfo info = context.getPackageManager().getPackageInfo(TAG,
					PackageManager.GET_SIGNATURES);
			for (Signature signature : info.signatures) {
				MessageDigest md = MessageDigest.getInstance("SHA");
				md.update(signature.toByteArray());
				String keyHash = Base64.encodeToString(md.digest(),
						Base64.DEFAULT);
				Log.d(TAG, "keyHash: " + keyHash);
			}
		} catch (NameNotFoundException e) {

		} catch (NoSuchAlgorithmException e) {

		}
	}

	public static void parseError(RetrofitError error, Context context) {
		String errorString = error.getMessage();
		if (errorString == null) {
			Response response = error.getResponse();
			errorString = response.getReason();
			if (errorString == null) {
				errorString = "error";
			}
		}
		if (context != null)
			Toast.makeText(context, errorString, Toast.LENGTH_SHORT).show();
	}
}