DeviceUtil.java

package example.base.util;

import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.provider.Settings;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;

import java.security.MessageDigest;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class DeviceUtil {

    public static int SCREEN_WIDTH = 0;

    public static boolean isConnected(Context context) {
        if (context == null) {
            return false;
        }
        ConnectivityManager cm =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

        return activeNetwork != null &&
                activeNetwork.isConnectedOrConnecting();
    }

    public static void hideSoftKeyboard(Activity activity) {
        if (activity == null) {
            return;
        }
        // Check if no view has focus:
        View view = activity.getCurrentFocus();
        if (view != null) {
            InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
    }

    public static boolean isXiaoMi() {
        return android.os.Build.MANUFACTURER.trim().toLowerCase().equals("xiaomi");
    }

    public static DisplayMetrics getDisplayMetrics(Context context) {
        DisplayMetrics metrics = new DisplayMetrics();
        WindowManager windowManager = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        windowManager.getDefaultDisplay().getMetrics(metrics);

        return metrics;
    }

    public static boolean isEmailValid(CharSequence email) {
        return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
    }

    public static boolean isPhoneValid(String s)
    {
        String regex ="^[89]\\d{7}$";

        try {
            Pattern patt = Pattern.compile(regex);
            Matcher matcher = patt.matcher(s);
            return matcher.matches();
        } catch (RuntimeException e) {
            return false;
        }
    }

    public static String generateDeviceUUID(Context context) {
        String serial = android.os.Build.SERIAL;
        String androidID = Settings.Secure.ANDROID_ID;
        String deviceUUID = serial + androidID;

        /*
         * SHA-1
         */
        MessageDigest digest;
        byte[] result;
        try {
            digest = MessageDigest.getInstance("SHA-1");
            result = digest.digest(deviceUUID.getBytes("UTF-8"));
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

        StringBuilder sb = new StringBuilder();
        for (byte b : result) {
            sb.append(String.format("%02X", b));
        }

        return sb.toString();
    }
}