Shared Preferences : Getting and Setting Data

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="370dp"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin" >

    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView2"        android:layout_centerVertical="true"        android:onClick="Save"        android:text="Save" />

    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:onClick="Get"        android:text="Get" />

    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/etEmail"        android:layout_alignBottom="@+id/etEmail"        android:layout_alignLeft="@+id/textView1"        android:text="Email"        android:textAppearance="?android:attr/textAppearanceMedium" />

    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/etEmail"        android:layout_centerVertical="true"        android:layout_marginRight="21dp"        android:onClick="clear"        android:text="Clear" />

    <EditText        android:id="@+id/etEmail"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_below="@+id/textView1"        android:layout_marginTop="36dp"        android:ems="10"        android:inputType="textEmailAddress" />

    <EditText        android:id="@+id/etName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_above="@+id/etEmail"        android:layout_alignLeft="@+id/etEmail"        android:ems="10"        android:inputType="text" />

    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginLeft="17dp"        android:layout_marginTop="39dp"        android:text="Name"        android:textAppearance="?android:attr/textAppearanceMedium" />


</RelativeLayout>

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {
    SharedPreferences sharedpreferences;
    TextView name;
    TextView email;
    public static final String mypreference = "mypref";
    public static final String Name = "nameKey";
    public static final String Email = "emailKey";

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        name = (TextView) findViewById(R.id.etName);
        email = (TextView) findViewById(R.id.etEmail);
        sharedpreferences = getSharedPreferences(mypreference,
                Context.MODE_PRIVATE);
        if (sharedpreferences.contains(Name)) {
            name.setText(sharedpreferences.getString(Name, ""));
        }
        if (sharedpreferences.contains(Email)) {
            email.setText(sharedpreferences.getString(Email, ""));

        }

    }

    public void Save(View view) {
        String n = name.getText().toString();
        String e = email.getText().toString();
        Editor editor = sharedpreferences.edit();
        editor.putString(Name, n);
        editor.putString(Email, e);
        editor.commit();
    }

    public void clear(View view) {
        name = (TextView) findViewById(R.id.etName);
        email = (TextView) findViewById(R.id.etEmail);
        name.setText("");
        email.setText("");

    }

    public void Get(View view) {
        name = (TextView) findViewById(R.id.etName);
        email = (TextView) findViewById(R.id.etEmail);
        sharedpreferences = getSharedPreferences(mypreference,
                Context.MODE_PRIVATE);

        if (sharedpreferences.contains(Name)) {
            name.setText(sharedpreferences.getString(Name, ""));
        }
        if (sharedpreferences.contains(Email)) {
            email.setText(sharedpreferences.getString(Email, ""));

        }
    }

}