Android Default SharedPreferences Example

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context="com.androidsimplifycodes.example.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="20dp">

        <EditText
            android:id="@+id/edText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <Button
            android:id="@+id/btnSave"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="Save" />

    </LinearLayout>

    <TextView
        android:id="@+id/tvStoredData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textAppearance="?android:textAppearanceLarge"
        android:textColor="@color/colorAccent" />

</LinearLayout>

MainActivity.java

package com.androidsimplifycodes.example;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    protected Context context;
    protected SharedPreferences sharedPreferences;
    protected SharedPreferences.Editor editor;
    protected EditText edText;
    protected TextView tvStoredData;
    protected Button btnSave;

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

        context = MainActivity.this;
        initView();

        // sharedPreferences used for the storing the data
        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());

        // get stored data from the SharedPreferences for the TAG _DATA
        tvStoredData.setText(sharedPreferences.getString("_DATA", "Default String"));

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

                editor = sharedPreferences.edit();
                editor.putString("_DATA", edText.getText().toString());
                // commit the changes
                boolean result = editor.commit();
                // if data committed then return true otherwise return false
                if (result) {
                    Toast.makeText(context, "Data Stored into SharedPreferences", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(context, "Problem Arrive for the storing Data", Toast.LENGTH_SHORT).show();
                }
            }
        });

    }

    private void initView() {
        edText = (EditText) findViewById(R.id.edText);
        tvStoredData = (TextView) findViewById(R.id.tvStoredData);
        btnSave = (Button) findViewById(R.id.btnSave);
    }
}

Output :

Here, sharedPreferences _DATA key not have any value so default string return.

String stored into sharedPreferences if successfully then return result true else false. Note : Only commit() function return result so we can use commit() function instead of apply().

Now _DATA key have some value so data will be return by sharedPreferences.