activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<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="22dp"
android:layout_marginTop="30dp"
android:text="Enter Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/pref_editText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="20dp"
android:ems="10" />
<TextView
android:id="@+id/pref_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView2"
android:layout_marginTop="28dp"
android:layout_toRightOf="@+id/textView1"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/show_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/pref_editText"
android:layout_marginLeft="16dp"
android:layout_marginTop="28dp"
android:layout_toRightOf="@+id/save_button"
android:text="Show" />
<Button
android:id="@+id/save_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/show_button"
android:layout_alignBottom="@+id/show_button"
android:layout_alignLeft="@+id/pref_editText"
android:text="Save" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/save_button"
android:layout_below="@+id/show_button"
android:layout_marginTop="105dp"
android:text="Preference Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/delete_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView2"
android:layout_marginLeft="18dp"
android:layout_toRightOf="@+id/textView2"
android:text="Delete" />
<Button
android:id="@+id/clear_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/show_button"
android:layout_centerVertical="true"
android:text="Clear All" />
</RelativeLayout>
MainActivity.java
package com.rajeshvijayakumar.sharedpreferences;import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private EditText mInputEditText;
private TextView mOutputView;
private Button mSaveButton;
private Button mShowButton;
private Button mDeleteButton;
private Button mClearButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mInputEditText = (EditText) findViewById(R.id.pref_editText);
mSaveButton = (Button) findViewById(R.id.save_button);
mShowButton = (Button) findViewById(R.id.show_button);
mDeleteButton = (Button) findViewById(R.id.delete_button);
mOutputView = (TextView) findViewById(R.id.pref_textView);
mClearButton = (Button) findViewById(R.id.clear_button);
mSaveButton.setOnClickListener(this);
mShowButton.setOnClickListener(this);
mDeleteButton.setOnClickListener(this);
mClearButton.setOnClickListener(this);
}
@Override
public void onClick(View v) {
String message="";
switch (v.getId()) {
case R.id.save_button:
SavePreferences("PrefDemo", mInputEditText.getText().toString());
message="Text Saved in Preferences";
break;
case R.id.delete_button:
deletePreferences("PrefDemo");
message = "Text Deleted from Preferences";
break;
case R.id.show_button:
showPreferences("PrefDemo");
message="Text Displayed from Preferences";
break;
case R.id.clear_button:
clearAllPreferences();
message="Removed All Text from All Preferences";
break;
}
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
private void SavePreferences(String key, String value) {
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(key, value);
editor.commit();
}
private void deletePreferences(String key) {
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.remove(key);
editor.commit();
}
private void clearAllPreferences() {
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.commit();
}
private void showPreferences(String key){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
String savedPref = sharedPreferences.getString(key, "");
mOutputView.setText(savedPref);
}
}
output :
Source Code : Download this Example Here
