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public static String printKeyHash(Activity context) {
        PackageInfo packageInfo;
        String key = null;
        try {
            //getting application package name, as defined in manifest
            String packageName = context.getApplicationContext().getPackageName();

            //Retriving package info
            packageInfo = context.getPackageManager().getPackageInfo(packageName,
                    PackageManager.GET_SIGNATURES);

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import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;

public class PhoneNumberTextWatcher implements TextWatcher {

    private static final String TAG = "PhoneNumberTextWatcher";
    private EditText editText;

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package com.karconnect.app.utils;


import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

/**

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package com.karconnect.app.utils;

import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AlertDialog;

public class NetworkUtils {

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import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**

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/**
     * push fragment
     *
     * @param fragment  fragment
     * @param animate   fragment transition animation
     * @param shouldAdd add to back stack
     * @param tag       fragment tag
     */
    public void pushFragments(Fragment fragment, boolean animate, boolean shouldAdd, String tag) {
        FragmentManager manager = getActivity().getSupportFragmentManager();

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import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;

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<LinearLayout
    ...
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="UnusedResources" >
    <TextView
        android:text="@string/str_foo_string" />
</LinearLayout>

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For SHA:

keytool -list -v -keystore '/home/../.android/debug.keystore'  -alias androiddebugkey -storepass android -keypass android

For Facebook KeyHash:

keytool -exportcert -alias androiddebugkey -keystore debug.keystore | openssl sha1 -binary | openssl base64

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/**
 * Copyright (c) 2013 Xcellent Creations, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions: