Interface for accessing and modifying preference data returned by 
MainActivity.java
getSharedPreferences(String, int). For any particular set of preferences, there is a single instance of this class that all clients share. Modifications to the preferences must go through an SharedPreferences.Editor object to ensure the preference values remain in a consistent state and control when they are committed to storage. Objects that are returned from the various get methods must be treated as immutable by the application.MainActivity.java
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
EditText user, pass;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
user = (EditText) findViewById(R.id.editText);
pass = (EditText) findViewById(R.id.editText2);
}
public void save(View view) {
SharedPreferences sharedPreferences =getSharedPreferences("MyData",MODE_PRIVATE);
SharedPreferences.Editor editor=sharedPreferences.edit();
editor.putString("name",user.getText().toString());
editor.putString("pass",pass.getText().toString());
editor.commit();
Toast.makeText(this, "Data was Saved successfully", Toast.LENGTH_SHORT).show();
}
public void next(View view) {
Toast.makeText(this, "Next", Toast.LENGTH_SHORT).show();
Intent in = new Intent(getApplicationContext(), Another.class);
startActivity(in);
}
}
Another.java
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class Another extends AppCompatActivity {
public static final String DEFAULT="N/A";
EditText user, passTv;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_another);
user = (EditText) findViewById(R.id.editText3);
passTv = (EditText) findViewById(R.id.editText4);
}
public void load(View view) {
SharedPreferences sharedPreferences=getSharedPreferences("MyData",
Context.MODE_PRIVATE);
String name =sharedPreferences.getString("name", DEFAULT);
String pass =sharedPreferences.getString("pass", DEFAULT);
if(name.equals(DEFAULT) || pass.equals(DEFAULT)) {
Toast.makeText(this, "No Data was Found", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(this, "Data Loaded successfully", Toast.LENGTH_SHORT).show();
user.setText(name);
passTv.setText(pass);
}
}
public void back(View view) {
Toast.makeText(this, "Back", Toast.LENGTH_SHORT).show();
Intent in = new Intent(getApplicationContext(), MainActivity.class);
startActivity(in);
}
}
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="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editText" android:layout_alignParentTop="true" android:layout_marginTop="63dp" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:hint="Username" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:inputType="textPassword" android:ems="10" android:id="@+id/editText2" android:layout_below="@+id/editText" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_alignRight="@+id/editText" android:layout_alignEnd="@+id/editText" android:hint="Password" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="save" android:id="@+id/saveBtn" android:onClick="save" android:layout_centerVertical="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Another" android:id="@+id/button" android:layout_centerVertical="true" android:onClick="next" android:layout_alignRight="@+id/editText2" android:layout_alignEnd="@+id/editText2" /> </RelativeLayout>
<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="match_parent"
android:paddingbottom="@dimen/activity_vertical_margin"
android:paddingleft="@dimen/activity_horizontal_margin"
android:paddingright="@dimen/activity_horizontal_margin"
android:paddingtop="@dimen/activity_vertical_margin"
tools:context="com.blogspot.help2computer.shared.Another">
<button
android:id="@+id/loadBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignparentleft="true"
android:layout_alignparentstart="true"
android:layout_alignparenttop="true"
android:layout_margintop="73dp"
android:onclick="load"
android:text="Load">
</button>
<button
android:id="@+id/backBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignbottom="@+id/loadBtn"
android:layout_alignparentend="true"
android:layout_alignparentright="true"
android:onclick="back"
android:text="back">
<edittext
android:id="@+id/editText3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignend="@+id/backBtn"
android:layout_alignparentleft="true"
android:layout_alignparentstart="true"
android:layout_alignright="@+id/backBtn"
android:layout_below="@+id/loadBtn"
android:layout_margintop="46dp"
android:hint="Username">
<edittext
android:id="@+id/editText4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignend="@+id/editText3"
android:layout_alignparentleft="true"
android:layout_alignparentstart="true"
android:layout_alignright="@+id/editText3"
android:layout_below="@+id/editText3"
android:ems="10"
android:hint="Password"
android:inputtype="textPassword"></edittext>
</edittext>
</button>
</relativelayout>
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