Shared Preference in Android

In this tutorial we learn about how to use Shared Preference in android.

Simple Demo example of shared prefrence.

http://www.varemads.com/category/android/

In the below example main activity xml look like this.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
       >
        <requestFocus />
    </EditText>
    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        
         />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Save" />

    <Button
        android:id="@+id/showdata"
        android:layout_marginTop="50dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Data" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceLarge" />
     <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

JAVA file for save data in shared preference.

private Button save,show;
 private EditText edt1,edt2;
 private TextView txt1,txt2;
 private String str1,str2;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.abcd);

  save  =  (Button) findViewById(R.id.button1);
  show  =  (Button) findViewById(R.id.showdata);
  edt1 = (EditText) findViewById(R.id.editText1);
  edt2 = (EditText) findViewById(R.id.editText2);
  txt1 = (TextView) findViewById(R.id.textView1);
  txt2 = (TextView) findViewById(R.id.textView2);
  
  save.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {
    
    str1 = edt1.getText().toString();
    str2 = edt2.getText().toString();
    
    SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
       SharedPreferences.Editor editor = sharedPreferences.edit();
       editor.putString("EDT1", str1);
       editor.putString("EDT2", str2);
       editor.commit();
   }
  });
  
  show.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View v) {

    SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
       String strSavedEDT1 = sharedPreferences.getString("EDT1", "");
       String strSavedEDT2 = sharedPreferences.getString("EDT2", "");
       txt1.setText(strSavedEDT1);
       txt2.setText(strSavedEDT2);
   }
  });
  
 } 

In above example on save button click value save to shared preference.

http://www.varemads.com/category/android/