SharedPreferences in Android?

SharedPreferences in Android?

It is used to provide a persistent object that can be used in another activity, shared preferences store data using key=>value pair.

Key is used to provide identity and value is used to store data.

Syntax:-

package com.example.webviewexample;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class SharedPreferencesExample extends AppCompatActivity {

    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shared_preferences_example);
        final SharedPreferences sharedpreferences = getSharedPreferences("pref", Context.MODE_PRIVATE);
        btn = findViewById(R.id.shbtnclick);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences.Editor editor = sharedpreferences.edit();
                editor.putInt("rno", 1001);
                editor.putString("sname","xyz");
                editor.commit();
                Intent i = new Intent(getApplicationContext(),MainActivity7.class);
                startActivity(i);

            }
        });
    }
}

MainActivity7.Java:-

package com.example.webviewexample;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity7 extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main7);
        TextView txt = findViewById(R.id.txtactivity2);
        @SuppressLint("WrongConstant") SharedPreferences sharedpreferences = getSharedPreferences("pref",Context.MODE_APPEND);
        int r = sharedpreferences.getInt("rno",0);
        String s = sharedpreferences.getString("sname",null);
        txt.setText("rno is "+r+ "name is "+s);


    }
}

Design File of XML:-

<?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=".MainActivity7">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtactivity2"></TextView>
</LinearLayout>