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

    <Button
        android:id="@+id/save_data"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Save data"
        />

    <Button
        android:id="@+id/restore_data"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Restore data"
        />

</LinearLayout>

package demo.jq.com.sharedpreferencestest;

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

/**
 * @author Jim
 */
public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button saveData = (Button) findViewById(R.id.save_data);
        Button restoreData = (Button) findViewById(R.id.restore_data);
        saveData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences.Editor editor = getSharedPreferences("data",MODE_PRIVATE).edit();
                editor.putString("name","Jim");
                editor.putInt("age",27);
                editor.putBoolean("married",true);
                editor.apply();
            }
        });

        restoreData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences pref = getSharedPreferences("data",MODE_PRIVATE);
                String name = pref.getString("name","");
                int age = pref.getInt("age",0);
                boolean married = pref.getBoolean("married",false);
                Log.d(TAG,"name is " + name);
                Log.d(TAG,"age is " + age);
                Log.d(TAG,"married is " + married);
            }
        });

    }
}