Quick preference tutorial

                        Quick preference  tutorial

QuickpreferenceActivity .java

package a.b;

import android.content.Intent;

import android.os.Bundle;

import android.preference.PreferenceActivity;

import android.view.Menu;

import android.view.MenuItem;

public class QuickpreferenceActivity extends PreferenceActivity {

    

    @Override

    public void onCreate(Bundle savedInstanceState) {        

        super.onCreate(savedInstanceState);        

        addPreferencesFromResource(R.xml.preff);        

    }

    

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        menu.add(Menu.NONE, 0, 0, "Show current settings");

        return super.onCreateOptionsMenu(menu);

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {

            case 0:

                startActivity(new Intent(this, ShowSettingsActivity.class));

                return true;

        }

        return false;

    }

    

}

ShowSettingsActivity 

package a.b;

import android.app.Activity;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.preference.PreferenceManager;

import android.widget.TextView;

public class ShowSettingsActivity extends Activity {

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);

  StringBuilder builder = new StringBuilder();

  builder.append("\n" + sharedPrefs.getBoolean("perform_updates", false));

  builder.append("\n" + sharedPrefs.getString("updates_interval", "-1"));

  builder.append("\n" + sharedPrefs.getString("welcome_message", "NULL"));

  TextView settingsTextView = (TextView) findViewById(R.id.settings_text_view);

  settingsTextView.setText(builder.toString());

 }

}

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:id="@+id/settings_text_view"

        android:layout_width="fill_parent" 

        android:layout_height="wrap_content"

    />

    

</LinearLayout>


pref.xml

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

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

    <PreferenceCategory 
        android:title="First Category"
        android:key="first_category">
        
        <CheckBoxPreference 
            android:key="perform_updates"
            android:summary="Enable or disable data updates"
            android:title="Enable updates" 
            android:defaultValue="true"
        />
        
        <ListPreference 
            android:key="updates_interval"
            android:title="Updates interval"
            android:summary="Define how often updates will be performed"
            android:defaultValue="1000" 
            android:entries="@array/updateInterval"
            android:entryValues="@array/updateIntervalValues"
            android:dependency="perform_updates"
        />    
            
    </PreferenceCategory>

    <PreferenceCategory 
        android:title="Second Category"
        android:key="second_category">

        <EditTextPreference
            android:key="welcome_message"
            android:title="Welcome Message" 
            android:summary="Define the Welcome message to be shown"
            android:dialogTitle="Welcome Message"
            android:dialogMessage="Provide a message"    
            android:defaultValue="Default welcome message" />

    </PreferenceCategory>
    
</PreferenceScreen>