Java tutorial
package com.hackeruproj.android.havatzfit.general_utilities; import android.Manifest; import android.annotation.TargetApi; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.SharedPreferences; import android.content.pm.PackageManager; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Build; import android.os.Bundle; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.util.Base64; import android.view.LayoutInflater; import android.view.View; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.google.firebase.auth.FirebaseAuth; import com.hackeruproj.android.havatzfit.R; import java.util.Calendar; /** * Created by Igor on 10-Aug-16. */ //general utilities class to hold all general values and methods of the App public class GenUtils { //final strings for bundle get arguments key public static final String PROGRAM = "program"; public static final String MODE = "mode"; //license agreement of the user public static final String HAS_AGREED = "termsAgreed"; //final string for the SP XML file name public static final String STAY_ON = "saveLogIn"; public static final String IS_CHECKED = "isChecked"; //creating variables for the Context and the prefs //start sharedprefrences values private Context context; private SharedPreferences pref; private SharedPreferences.Editor editor; //finish sharedprefrences values public GenUtils(Context context) { this.context = context; } //start method that sets the shared prefrences and itseditor private void setSharedPrefs() { pref = context.getApplicationContext().getSharedPreferences(STAY_ON, 0); editor = pref.edit(); } //finish method that sets the shared prefrences and itseditor //start methods for SharedPrefs public void saveUser(String value) { setSharedPrefs(); editor.putBoolean(value, true).commit(); } public boolean isChecked(String value) { setSharedPrefs(); boolean checked = pref.getBoolean(value, false); return checked; } public void removeUser(String value) { setSharedPrefs(); editor.remove(value).commit(); } //finish methods for SharedPrefs //start check runtime permission public static boolean chkLocPerm(Context context) { if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { return false; } return true; } //finish check runtime permission //start get current date method public static String getCurrentDate() { int day, month, year; //<-- int variables needed to draw from calendar class String signUpDate; //<-- String variable to compose the date of the user signing up for the first time! //start Calendar init Calendar c = Calendar.getInstance(); //finish Calendar init //start insert current date into vars day = c.get(Calendar.DATE); month = c.get(Calendar.MONTH) + 1;//<-- set the month count from 1 not 0 year = c.get(Calendar.YEAR); //finish insert current date into vars //start compose String holding the date of First Signup! signUpDate = "Day: " + day + " "; signUpDate += "Month: " + month + " "; signUpDate += "Year: " + year; //finish start compose String holding the date of First Signup! return signUpDate; } //finish get currrent date method //start static method to convert strings into btimap public static Bitmap string2Bitmap(String encodeString) { try { byte[] encodeByte = Base64.decode(encodeString, Base64.DEFAULT); Bitmap mBitmap = BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length); return mBitmap; } catch (Exception e) { e.getMessage(); return null; } } //finish static method to convert strings into btimap //start static bundle method public static Bundle setStringArgsBundle(String bundleKey, String bundleValue) { Bundle bundleArgs = new Bundle(); bundleArgs.putString(bundleKey, bundleValue); return bundleArgs; } //finish static bundle method //start static bundle overloaded method set 2 args public static Bundle setStringArgsBundle(String bundleKey, String bundleValue, String bundleKey2, String bundleValue2) { Bundle bundleArgs = new Bundle(); bundleArgs.putString(bundleKey, bundleValue); bundleArgs.putString(bundleKey2, bundleValue2); return bundleArgs; } //finish static bundle overloaded method set 2 args //start test connection public static boolean isNetworkEnabled(Context context) { ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetwrok = cm.getActiveNetworkInfo(); boolean isConnected = activeNetwrok != null && activeNetwrok.isConnectedOrConnecting(); return isConnected; } //finish test connection //start public static void menuAlerts(Context context, int header, int theme, int img) { AlertDialog.Builder menuBuilder = new AlertDialog.Builder(context); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View menuView = inflater.inflate(R.layout.inflater_alertdialog, null); menuBuilder.setView(menuView); TextView headerText = (TextView) menuView.findViewById(R.id.alertTxtHeader); TextView bodyText = (TextView) menuView.findViewById(R.id.alertTxtBody); ImageView imgView = (ImageView) menuView.findViewById(R.id.alertImgBody); headerText.setText(header); bodyText.setText(theme); imgView.setImageResource(img); menuBuilder.setNeutralButton("Ok", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); menuBuilder.show(); } //finish }