Implementing onSavedInstanceState.

MainActivity.java

package com.example.android.sampleform;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.EditText;

/**
 * Demonstrates the activity lifecycle and saving data before the activity is destroyed
 */
public class MainActivity extends ActionBarActivity {

    private final static String TAG = MainActivity.class.getSimpleName();

    @Override
    public void onSaveInstanceState(Bundle outState) {
        Log.d(TAG, "Saving instance state");
        outState.putString("name", ((EditText) findViewById(R.id.name)).getText().toString());
        outState.putString("address", ((EditText) findViewById(R.id.address)).getText().toString());
        outState.putString("phone", ((EditText) findViewById(R.id.phone)).getText().toString());
        outState.putString("email", ((EditText) findViewById(R.id.email)).getText().toString());
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.d(TAG, "Create");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState != null) {
            Log.d(TAG, "Repopulating form");
            ((EditText) findViewById(R.id.name)).setText(savedInstanceState.getString("name"));
            ((EditText) findViewById(R.id.address)).setText(savedInstanceState.getString("address"));
            ((EditText) findViewById(R.id.phone)).setText(savedInstanceState.getString("phone"));
            ((EditText) findViewById(R.id.email)).setText(savedInstanceState.getString("email"));
        }
    }

    @Override
    protected void onStart() {
        Log.d(TAG, "Start");
        super.onStart();
    }

    @Override
    protected void onResume() {
        Log.d(TAG, "Resume");
        super.onResume();
    }

    @Override
    protected void onPause() {
        Log.d(TAG, "Pause");
        super.onPause();
    }

    @Override
    protected void onStop() {
        Log.d(TAG, "Stop");
        super.onStop();
    }

    @Override
    protected void onDestroy() {
        Log.d(TAG, "Destroy");
        super.onDestroy();
    }
}