Saving Data using Shared Preference

Shared Preference : 

Shared preference is used to save and retrieve the data within the app.
Note : Once the application is uninstalled the saved data gets erased.
There 2 process one to save and another to retrieve. The following code depicts :

MainActvity.java  :

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package com.appyware.sharedpreference_demo; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.View; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends ActionBarActivity { EditText editText; TextView textView; SharedPreferences sharedPreferences; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editText = (EditText) findViewById(R.id.edittext); textView = (TextView) findViewById(R.id.textview); // Retrieve and hold contents sharedPreferences = getSharedPreferences("sharedPreferences", Context.MODE_PRIVATE); // Get the string value and set text textView.setText(sharedPreferences.getString("key", null)); } /* to save data using shared preference */ public void save(View v) { if (editText.getText().toString().trim().length() > 0) { String text = editText.getText().toString(); SharedPreferences.Editor editor = sharedPreferences.edit(); editor.putString("key", text); editor.commit(); textView.setText(sharedPreferences.getString("key", null)); } } }

Activity_main.xml :

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/edittext" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="20dp" android:hint="Enter the text" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:onClick="save" android:text="Save" /> <TextView android:id="@+id/textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_margin="20dp" android:textSize="30sp" /> </LinearLayout>

Complete Source Code : SharedPreference-Demo

For any doubts you can comment below, i'll respond ASAP.