MainActivity.java

package com.bigfat.sharedpreferencestest;

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


public class MainActivity extends ActionBarActivity implements View.OnClickListener {

    public static final String TAG = "MainActivity";

    private Button saveData;
    private Button restoreData;

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

        saveData = (Button) findViewById(R.id.save_data);
        restoreData = (Button) findViewById(R.id.restore_data);

        saveData.setOnClickListener(this);
        restoreData.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.save_data:
                SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
                editor.putString("name", "Tom");
                editor.putInt("age", 30);
                editor.putBoolean("married", false);
                editor.apply();
                break;

            case R.id.restore_data:
                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);
                break;
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}