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public static void wakeUpPhone(Context context, String tag) {
    PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock wakeLock = powerManager.newWakeLock((
            PowerManager.SCREEN_BRIGHT_WAKE_LOCK |
                    PowerManager.FULL_WAKE_LOCK |
                    PowerManager.ACQUIRE_CAUSES_WAKEUP), tag);
                    
    wakeLock.acquire();
}

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    /**
     * Removes all white spaces from string
     *
     * @param text - text to remove white spaces from
     * @return - text without any whitespaces
     */
    public static String removeWhiteSpaces(String text) {
        return text.replaceAll("\\s+", "");
    }

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/**
 * Check if the string contains a number or a special character
 *
 * @param text - string to check
 * @return - true if it contains a number or a special character, else false
 */
public boolean textContainsSpecialCharsOrNumbers(String text) {
    return !text.matches("^[a-z A-Z]+$");
}

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TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
String phoneNumber = telephonyManager.getLine1Number();

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    public static void goToAppSettings(final Context context) {
        final Uri uri = Uri.fromParts("package", context.getPackageName(), null);

        final Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, uri);
        context.startActivity(intent);
    }

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    /**
     * Returns the current enabled/disabled status of the GPS provider.
     * <p/>
     * If the user has enabled GPS in the Settings menu, true
     * is returned otherwise false is returned
     */
    public static boolean isGpsEnabled(final Context context) {
        final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    }

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    public static String getStringFromAssetFile(final Context context, final String filename) {
        final int MAX_BUFF = 1024 * 100;

        final InputStream is;
        final InputStreamReader isr;
        final BufferedReader br;
        String resultData = "";

        try {
            final AssetManager am = context.getAssets();

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final InputMethodManager inputMethodManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);

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Generate KeyHash for Facebook SDK

1. First open a terminal (open a command prompt in windows).
2. Navigate in the terminal to the directory where your Android debug.keystore is stored.
3. Mostly it will located under “/Users/user_name/.android/” (In Windows will be C:\Documents and Settings\.android).
4. Once you are in the “.android” directory, run the following command.keytool -exportcert -alias androiddebugkey -keystore debug.keystore | openssl sha1 -binary | openssl base64


Note: “androiddebugkey” can be the username for the keystone file and “debug.keystore” can be the name of the keynote file 

1. When it prompts you for a password, type android and hit Enter

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/usr/libexec/java_home