Part 19 - Simple SharedPreferences

 Java Part : 

package first.learn.sharedpreference;

import static first.learn.sharedpreference.Common.getBooleanFromPref;
import static first.learn.sharedpreference.Common.getStringFromPref;
import static first.learn.sharedpreference.Common.saveBooleanToPref;
import static first.learn.sharedpreference.Common.saveStringToPref;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {


    public  static final  String NAME = "NAME" ;
    public  static final  String ADDRESS = "ADDRESS" ;
    public  static final  String AGE = "AGE" ;
    public  static final  String MARITAL_STATUS = "MARITAL_STATUS" ;


    private  String name = "";
    private  String age = "";
    private  String address= "";
    private  boolean maritalStatus = false ;




    EditText etAddress,
    etAge,
            etName;

    CheckBox checkbox;
    Button btnSave, btnShow;





    Context mContext ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mContext = this ;


        etAddress  = (EditText)findViewById(R.id.etAddress);
        etAge = (EditText)findViewById(R.id.etAge);
        etName = (EditText)findViewById(R.id.etName);
        checkbox = (CheckBox) findViewById(R.id.checkbox);



        btnSave = (Button) findViewById(R.id.btnSave);
        btnShow = (Button) findViewById(R.id.btnShow);


        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                if(!isEditTextHasText(etName)
                || !isEditTextHasText(etAge)
                || !isEditTextHasText(etAddress)){

                    Toast.makeText(MainActivity.this, "Please Fill All The Field", Toast.LENGTH_SHORT).show();
                    return;
                }


                name = etName.getText().toString();
                age = etAge.getText().toString();
                address = etAddress.getText().toString();

                saveStringToPref(mContext, NAME,name );
                saveStringToPref(mContext, ADDRESS,address );
                saveStringToPref(mContext, AGE,  age );



                maritalStatus = checkbox.isChecked();
                saveBooleanToPref(mContext, MARITAL_STATUS,  maritalStatus  );

                Toast.makeText(mContext, "Saved SuccessFully", Toast.LENGTH_SHORT).show();


            }
        });


        btnShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                name  = getStringFromPref( mContext, NAME , "Not Saved");
                etName.setText(name);

                address = getStringFromPref(mContext, ADDRESS, "No Address");
                etAddress.setText(address);

                age = getStringFromPref(mContext, AGE, "No Age");
                etAge.setText(age);

                maritalStatus = getBooleanFromPref ( mContext,  MARITAL_STATUS, false);

                checkbox.setChecked(maritalStatus);


                Toast.makeText(mContext, "Alhamdulillah, Data Retrieve Successfully", Toast.LENGTH_SHORT).show();



            }
        });







    }

    boolean isEditTextHasText (EditText editText){

        String s = editText.getText().toString();

        if(TextUtils.isEmpty(s)){
            return  false ;
        }else {
            return  true ;
        }

    }




}

xml Part : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">

   <EditText
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="name....."
       android:id="@+id/etName"/>


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="age....."
        android:id="@+id/etAge"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="address....."
        android:id="@+id/etAddress"/>

    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Marital Status"
        android:id="@+id/checkbox"/>


    <Button
        android:layout_marginTop="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSave"
        android:text="Save"/>

    <Button
        android:layout_marginTop="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnShow"
        android:text="Retrieve"/>


</LinearLayout>

Common Class : 

package first.learn.sharedpreference;

import android.content.Context;
import android.content.SharedPreferences;
import android.widget.Toast;

public class Common {


    public  static  void saveStringToPref(Context mContext, String packageName, String value ){

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = settings.edit();

        editor.putString(packageName, value);
        editor.apply();

    }


    public  static  void saveBooleanToPref(Context mContext, String packageName, boolean value ){

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = settings.edit();

        editor.putBoolean(packageName, value);
        editor.apply();

    }


    public  static  String getStringFromPref(Context mContext, String packetName, String defaultValue){

        String s = defaultValue ;

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);


         s = settings.getString(packetName, defaultValue);

         return  s ;


    }

    public  static  boolean getBooleanFromPref (Context mContext, String packageName, boolean value){

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);


        boolean b = settings.getBoolean(packageName, value);

        return  b ;

    }




}