Store information into Preference

     

package app.test;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class Test extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        WebView webview = new WebView(this);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.setWebViewClient(mClient);
        webview.addJavascriptInterface(new MyJavaScriptInterface(), "BRIDGE");
        setContentView(webview);
        webview.loadUrl("file:///android_asset/form.html");
    }

    private static final String JS_SETELEMENT = "javascript:document.getElementById('%s').value='%s'";
    private static final String JS_GETELEMENT = 
                    "javascript:window.BRIDGE.storeElement('%s',document.getElementById('%s').value)";
    private static final String ELEMENTID = "emailAddress";

    private WebViewClient mClient = new WebViewClient() {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(String.format(JS_GETELEMENT, ELEMENTID, ELEMENTID));
            return false;
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            SharedPreferences prefs = getPreferences(Activity.MODE_PRIVATE);
            view.loadUrl(String.format(JS_SETELEMENT, ELEMENTID, prefs.getString(ELEMENTID, "")));
        }
    };

    private class MyJavaScriptInterface {
        public void storeElement(String id, String element) {
            SharedPreferences.Editor edit = getPreferences(Activity.MODE_PRIVATE).edit();
            edit.putString(id, element);
            edit.commit();
            if(!TextUtils.isEmpty(element)) {
                Toast.makeText(Test.this, element, Toast.LENGTH_SHORT).show();
            }
        }
    }
}
/*<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<html>
<form name="input" action="form.html" method="get">
Enter Email: <input type="text" id="emailAddress" />
<input type="submit" value="Submit" />
</form>
</html>*/

Edit Preferences

package com.commonsware.android.simple;

import android.app.Activity;
import android.os.Bundle;
import android.preference.PreferenceActivity;


public class EditPreferences extends PreferenceActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    addPreferencesFromResource(R.xml.preferences);
  }
}




//src\com\commonsware\android\simple\SimplePrefsDemo.java
   
package com.commonsware.android.simple;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class SimplePrefsDemo extends Activity {
  private static final int EDIT_ID = Menu.FIRST+2;
  
  private TextView checkbox=null;
  private TextView ringtone=null;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    
    checkbox=(TextView)findViewById(R.id.checkbox);
    ringtone=(TextView)findViewById(R.id.ringtone);
  }
  
  @Override
  public void onResume() {
    super.onResume();
    
    SharedPreferences prefs=PreferenceManager
                              .getDefaultSharedPreferences(this);
    
    checkbox.setText(new Boolean(prefs
                                  .getBoolean("checkbox", false))
                        .toString());
    ringtone.setText(prefs.getString("ringtone", "<unset>"));
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    menu.add(Menu.NONE, EDIT_ID, Menu.NONE, "Edit Prefs")
        .setIcon(R.drawable.misc)
        .setAlphabeticShortcut('e');

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case EDIT_ID:
        startActivity(new Intent(this, EditPreferences.class));
        return(true);
    }

    return(super.onOptionsItemSelected(item));
  }
}



//res\layout\main.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
>
  <TableRow>
    <TextView
        android:text="Checkbox:"
        android:paddingRight="5px"
    />
    <TextView android:id="@+id/checkbox"
    />
  </TableRow>
  <TableRow>
    <TextView
        android:text="Ringtone:"
        android:paddingRight="5px"
    />
    <TextView android:id="@+id/ringtone"
    />
  </TableRow>
</TableLayout>



//res\values\strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="app_name">SimplePrefsDemo</string>
  <string name="checkbox">checkbox</string>
  <string name="ringtone">ringtone</string>
</resources>



//res\xml\preferences.xml
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">
  <CheckBoxPreference
    android:key="checkbox"
    android:title="Checkbox Preference"
    android:summary="Check it on, check it off" />
  <RingtonePreference
    android:key="ringtone"
    android:title="Ringtone Preference"
    android:showDefault="true"
    android:showSilent="true"
    android:summary="Pick a tone, any tone" />
</PreferenceScreen>

Structured Preferences

package com.commonsware.android.prefs;

import android.app.Activity;
import android.os.Bundle;
import android.preference.PreferenceActivity;


public class EditPreferences extends PreferenceActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    addPreferencesFromResource(R.xml.preferences);
  }
}




//src\com\commonsware\android\prefs\StructuredPrefsDemo.java
   
package com.commonsware.android.prefs;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class StructuredPrefsDemo extends Activity {
  private static final int EDIT_ID = Menu.FIRST+2;
  
  private TextView checkbox=null;
  private TextView ringtone=null;
  private TextView checkbox2=null;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    
    checkbox=(TextView)findViewById(R.id.checkbox);
    ringtone=(TextView)findViewById(R.id.ringtone);
    checkbox2=(TextView)findViewById(R.id.checkbox2);
  }
  
  @Override
  public void onResume() {
    super.onResume();
    
    SharedPreferences prefs=PreferenceManager
                              .getDefaultSharedPreferences(this);
    
    checkbox.setText(new Boolean(prefs
                                  .getBoolean("checkbox", false))
                        .toString());
    ringtone.setText(prefs.getString("ringtone", "<unset>"));
    checkbox2.setText(new Boolean(prefs
                                  .getBoolean("checkbox2", false))
                        .toString());
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    menu.add(Menu.NONE, EDIT_ID, Menu.NONE, "Edit Prefs")
        .setIcon(R.drawable.misc)
        .setAlphabeticShortcut('e');

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case EDIT_ID:
        startActivity(new Intent(this, EditPreferences.class));
        return(true);
    }

    return(super.onOptionsItemSelected(item));
  }
}


//res\layout\main.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
>
  <TableRow>
    <TextView
        android:text="Checkbox:"
        android:paddingRight="5px"
    />
    <TextView android:id="@+id/checkbox"
    />
  </TableRow>
  <TableRow>
    <TextView
        android:text="Ringtone:"
        android:paddingRight="5px"
    />
    <TextView android:id="@+id/ringtone"
    />
  </TableRow>
  <TableRow>
    <TextView
        android:text="Checkbox #2:"
        android:paddingRight="5px"
    />
    <TextView android:id="@+id/checkbox2"
    />
  </TableRow>
</TableLayout>



//res\values\strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="app_name">StructuredPrefsDemo</string>
  <string name="checkbox">checkbox</string>
  <string name="ringtone">ringtone</string>
  <string name="checkbox2">checkbox2</string>
</resources>



//res\xml\preferences.xml
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">
  <PreferenceCategory android:title="Simple Preferences">
    <CheckBoxPreference
      android:key="checkbox"
      android:title="Checkbox Preference"
      android:summary="Check it on, check it off"
    />
    <RingtonePreference
      android:key="ringtone"
      android:title="Ringtone Preference"
      android:showDefault="true"
      android:showSilent="true"
      android:summary="Pick a tone, any tone"
    />
  </PreferenceCategory>
  <PreferenceCategory android:title="Detail Screens">
    <PreferenceScreen
      android:key="detail"
      android:title="Detail Screen"
      android:summary="Additional preferences held in another page">
      <CheckBoxPreference
        android:key="checkbox2"
        android:title="Another Checkbox"
        android:summary="On. Off. It really doesn't matter."
      />
    </PreferenceScreen>
  </PreferenceCategory>
</PreferenceScreen>

Save value to preference

     

package app.test;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Toast;

public class Test extends Activity {
    private SharedPreferences prefs;
    private EditText editText;
    private SeekBar seekBar;
    private Button btn;
    private String FONT_SIZE_KEY = "fontsize";
    private String TEXT_VALUE_KEY = "textvalue";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
                
        editText = (EditText) findViewById(R.id.EditText01);
        seekBar = (SeekBar) findViewById(R.id.SeekBar01);
        btn = (Button) findViewById(R.id.btnSave);
        
        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
              //---get the SharedPreferences object---
              //prefs = getSharedPreferences(prefName, MODE_PRIVATE);
              prefs = getPreferences(MODE_PRIVATE);
              
                SharedPreferences.Editor editor = prefs.edit();
                //---save the values in the EditText view to preferences---                
                editor.putFloat(FONT_SIZE_KEY, editText.getTextSize());  
                editor.putString(TEXT_VALUE_KEY, editText.getText().toString());
                
                editor.commit();       
                Toast.makeText(getBaseContext(), 
                    "Font size saved successfully!", 
                    Toast.LENGTH_SHORT).show();
            }
        });        
        
        //---load the SharedPreferences object---
        //SharedPreferences prefs = getSharedPreferences(prefName, MODE_PRIVATE);
        prefs = getPreferences(MODE_PRIVATE);
        
        float fontSize = prefs.getFloat(FONT_SIZE_KEY, 12);
        
        seekBar.setProgress((int) fontSize);
        editText.setText(prefs.getString(TEXT_VALUE_KEY, ""));
        editText.setTextSize(seekBar.getProgress());
        
        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {      
      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {                
      }
      
      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {        
      }
      
      @Override
      public void onProgressChanged(SeekBar seekBar, int progress,
          boolean fromUser) {
        editText.setTextSize(progress);
      }
    }); 
    }
}
//main.xml

<?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"
    >
    
<SeekBar 
    android:id="@+id/SeekBar01" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />
    
<TextView  
    android:id="@+id/TextView01"    
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello" />
        
<EditText 
    android:id="@+id/EditText01" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />
    
<Button 
    android:id="@+id/btnSave" 
    android:text="Save"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" />    

</LinearLayout>

Example that shows finding a preference from the hierarchy and a custom preference type.

package com.example.android.apis.preference;


import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceActivity;
import android.preference.CheckBoxPreference;
import android.widget.Toast;

/**
 * Example that shows finding a preference from the hierarchy and a custom preference type.
 */
public class AdvancedPreferences extends PreferenceActivity implements OnSharedPreferenceChangeListener {
    public static final String KEY_MY_PREFERENCE = "my_preference";
    public static final String KEY_ADVANCED_CHECKBOX_PREFERENCE = "advanced_checkbox_preference";

    private CheckBoxPreference mCheckBoxPreference;
    private Handler mHandler = new Handler();

    /**
     * This is a simple example of controlling a preference from code.
     */
    private Runnable mForceCheckBoxRunnable = new Runnable() {
        public void run() {
            if (mCheckBoxPreference != null) {
                mCheckBoxPreference.setChecked(!mCheckBoxPreference.isChecked());
            }

            // Force toggle again in a second
            mHandler.postDelayed(this, 1000);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Load the XML preferences file
        addPreferencesFromResource(R.xml.advanced_preferences);

        // Get a reference to the checkbox preference
        mCheckBoxPreference = (CheckBoxPreference)getPreferenceScreen().findPreference(
                KEY_ADVANCED_CHECKBOX_PREFERENCE);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // Start the force toggle
        mForceCheckBoxRunnable.run();

        // Set up a listener whenever a key changes
        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();

        // Unregister the listener whenever a key changes
        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);

        mHandler.removeCallbacks(mForceCheckBoxRunnable);
    }

    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        // Let's do something when my counter preference value changes
        if (key.equals(KEY_MY_PREFERENCE)) {
            Toast.makeText(this, "Thanks! You increased my count to "
                    + sharedPreferences.getInt(key, 0), Toast.LENGTH_SHORT).show();
        }
    }

}

//xml/advanced_preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
        xmlns:android="http://schemas.android.com/apk/res/android">

    <com.example.android.apis.preference.MyPreference
            android:key="my_preference"
            android:title="@string/title_my_preference"
            android:summary="@string/summary_my_preference"
            android:defaultValue="100" />

    <CheckBoxPreference
            android:key="advanced_checkbox_preference"
            android:title="@string/title_advanced_toggle_preference"
            android:summaryOn="@string/summary_on_advanced_toggle_preference" 
            android:summaryOff="@string/summary_off_advanced_toggle_preference" />

</PreferenceScreen>

Increment Access Count

     
//package org.anddev.andengine.util;


import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.PreferenceManager;

class SimplePreferences {
  private static SharedPreferences INSTANCE;
  private static Editor EDITORINSTANCE;

  public static SharedPreferences getInstance(final Context pContext) {
    if(SimplePreferences.INSTANCE == null) {
      SimplePreferences.INSTANCE = PreferenceManager.getDefaultSharedPreferences(pContext);
    }
    return SimplePreferences.INSTANCE;
  }

  public static Editor getEditorInstance(final Context pContext) {
    if(SimplePreferences.EDITORINSTANCE == null) {
      SimplePreferences.EDITORINSTANCE = SimplePreferences.getInstance(pContext).edit();
    }
    return SimplePreferences.EDITORINSTANCE;
  }

  public static int incrementAccessCount(final Context pContext, final String pKey) {
    return SimplePreferences.incrementAccessCount(pContext, pKey, 1);
  }

  public static int incrementAccessCount(final Context pContext, final String pKey, final int pIncrement) {
    final SharedPreferences prefs = SimplePreferences.getInstance(pContext);
    final int accessCount = prefs.getInt(pKey, 0);

    final int newAccessCount = accessCount + pIncrement;
    prefs.edit().putInt(pKey, newAccessCount).commit();

    return newAccessCount;
  }

  public static int getAccessCount(final Context pCtx, final String pKey) {
    return SimplePreferences.getInstance(pCtx).getInt(pKey, 0);
  }

}

finish When Expired

     
//package org.anddev.andengine.util;

import java.util.GregorianCalendar;

import android.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.PreferenceManager;


public class BetaUtils {

  private static final String PREFERENCES_BETAUTILS_ID = "preferences.betautils.lastuse";
  //          
  // Getter & Setter
  //          

  //          
  // Methods from SuperClass/Interfaces
  //          

  //          
  // Methods
  //          

  public static boolean finishWhenExpired(final Activity pActivity, final GregorianCalendar pExpirationDate, final int pTitleResourceID, final int pMessageResourceID) {
    return BetaUtils.finishWhenExpired(pActivity, pExpirationDate, pTitleResourceID, pMessageResourceID, null, null);
  }

  public static boolean finishWhenExpired(final Activity pActivity, final GregorianCalendar pExpirationDate, final int pTitleResourceID, final int pMessageResourceID, final Intent pOkIntent, final Intent pCancelIntent) {
    final SharedPreferences spref = SimplePreferences.getInstance(pActivity);

    final long now = System.currentTimeMillis();
    final long lastuse = Math.max(now, spref.getLong(PREFERENCES_BETAUTILS_ID, -1));
    spref.edit().putLong(PREFERENCES_BETAUTILS_ID, lastuse).commit();

    final GregorianCalendar lastuseDate = new GregorianCalendar();
    lastuseDate.setTimeInMillis(lastuse);

    if(lastuseDate.after(pExpirationDate)){
      final Builder alertDialogBuilder = new AlertDialog.Builder(pActivity)
      .setTitle(pTitleResourceID)
      .setIcon(R.drawable.ic_dialog_alert)
      .setMessage(pMessageResourceID);

      alertDialogBuilder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener(){
        @Override
        public void onClick(final DialogInterface pDialog, final int pWhich) {
          if(pOkIntent != null) {
            pActivity.startActivity(pOkIntent);
          }
          pActivity.finish();
        }
      });
      alertDialogBuilder.setNegativeButton(android.R.string.cancel, new OnClickListener() {
        @Override
        public void onClick(final DialogInterface pDialog, final int pWhich) {
          if(pCancelIntent != null) {
            pActivity.startActivity(pCancelIntent);
          }
          pActivity.finish();
        }
      })
      .create().show();
      return true;
    }else{
      return false;
    }
  }

  //          
  // Inner and Anonymous Classes
  //          
}
class SimplePreferences  {
  //          
  // Constants
  //          

  //          
  // Fields
  //          

  private static SharedPreferences INSTANCE;
  private static Editor EDITORINSTANCE;

  //          
  // Constructors
  //          

  public static SharedPreferences getInstance(final Context pContext) {
    if(SimplePreferences.INSTANCE == null) {
      SimplePreferences.INSTANCE = PreferenceManager.getDefaultSharedPreferences(pContext);
    }
    return SimplePreferences.INSTANCE;
  }

  public static Editor getEditorInstance(final Context pContext) {
    if(SimplePreferences.EDITORINSTANCE == null) {
      SimplePreferences.EDITORINSTANCE = SimplePreferences.getInstance(pContext).edit();
    }
    return SimplePreferences.EDITORINSTANCE;
  }

  //          
  // Getter & Setter
  //          

  //          
  // Methods for/from SuperClass/Interfaces
  //          

  //          
  // Methods
  //          

  public static int incrementAccessCount(final Context pContext, final String pKey) {
    return SimplePreferences.incrementAccessCount(pContext, pKey, 1);
  }

  public static int incrementAccessCount(final Context pContext, final String pKey, final int pIncrement) {
    final SharedPreferences prefs = SimplePreferences.getInstance(pContext);
    final int accessCount = prefs.getInt(pKey, 0);

    final int newAccessCount = accessCount + pIncrement;
    prefs.edit().putInt(pKey, newAccessCount).commit();

    return newAccessCount;
  }

  public static int getAccessCount(final Context pCtx, final String pKey) {
    return SimplePreferences.getInstance(pCtx).getInt(pKey, 0);
  }

  //          
  // Inner and Anonymous Classes
  //          
}

Store your information into SharedPreferences

     
package app.test;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class HomeActivity extends Activity implements View.OnClickListener {
    
    Button settingsButton;
    TextView displayText;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        PreferenceManager.setDefaultValues(this, R.xml.settings, false);
        displayText = (TextView)findViewById(R.id.display);
        settingsButton = (Button)findViewById(R.id.settings);
        settingsButton.setOnClickListener(this);
    }
    
    @Override
    public void onResume() {
        super.onResume();
        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
        StringBuilder builder = new StringBuilder();
        builder.append("User Name: "+settings.getString("namePref", "")+"\n");
        if(!settings.getBoolean("morePref", false)) {
            builder.append("More Settings is DISABLED");
        } else {
            builder.append("More Settings is ENABLED\n");
            builder.append("Favorite Color is "+settings.getString("colorPref", "")+"\n");
            builder.append(settings.getBoolean("myGPS", false) ? "GPS is ENABLED\n" : "GPS is DISABLED\n");
        }
        displayText.setText(builder.toString());
    }
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(this, SettingsActivity.class);
        startActivity(intent);
    }
}



//SettingsActivity.java
package app.test;

import android.os.Bundle;
import android.preference.PreferenceActivity;

public class SettingsActivity extends PreferenceActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);
    }

}



//arrays.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="color_names">
      <item>Black</item>
      <item>Red</item>
      <item>Green</item>
    </string-array>
    <string-array name="color_values">
      <item>BLK</item>
      <item>RED</item>
      <item>GRN</item>
    </string-array>
</resources>



//main.xml
<?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">
  <TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Current Settings:"
  />
  <TextView
    android:id="@+id/display"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:padding="10dip" 
  />
  <Button
    android:id="@+id/settings"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Change Settings"
  />
</LinearLayout>



//settings.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
  <EditTextPreference
    android:key="namePref"
    android:title="Name"
    android:summary="Tell Us Your Name"
    android:defaultValue="Apress"
  />
  <CheckBoxPreference
      android:key="morePref"
      android:title="Enable More Settings"
      android:defaultValue="false"
  />
  <PreferenceScreen
    android:key="moreScreen"
    android:title="More Settings"
    android:dependency="morePref">
    <ListPreference
      android:key="colorPref"
      android:title="Favorite Color"
      android:summary="Choose your favorite color"
      android:entries="@array/color_names"
      android:entryValues="@array/color_values"
      android:defaultValue="GRN"
    />
    <PreferenceCategory
      android:title="Location Settings">
      <CheckBoxPreference
        android:key="myGPS"
        android:title="Use GPS Location"
        android:summary="Use GPS to Find You"
        android:defaultValue="true"
      />
    </PreferenceCategory>
  </PreferenceScreen>
</PreferenceScreen>

Android Tutorial - Core Class : SharedPreferences