android - Preferences Activity example code



1.MainActivity.java

public class MainActivity extends ActionBarActivity {

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);        
        setContentView(R.layout.activity_main);
        SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);        


        StringBuilder str = new StringBuilder();        
        str.append("\nkey1:"+sharedPrefs.getString("key1", "NULL"));        
        str.append("\nkey2:"+sharedPrefs.getBoolean("key2", false));        
        str.append("\nkey3:"+sharedPrefs.getString("key3", "NULL"));        
        TextView settingsTextView = (TextView) findViewById(R.id.txt_setting);        
        settingsTextView.setText(str.toString());
    }


    @Override    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.settings, menu);        
        return true;    
     }

    @Override    public boolean onOptionsItemSelected(MenuItem item) {

             int id = item.getItemId();
             if (id == R.id.menu_settings) {
                  Intent intent = new Intent(MainActivity.this, UserSettingActivity.class);            
                  MainActivity.this.startActivity(intent);        
             }
             return super.onOptionsItemSelected(item);    
       }

}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    
                            xmlns:tools="http://schemas.android.com/tools" 
                            android:layout_width="match_parent"    
                            android:layout_height="match_parent">

    <TextView android:id="@+id/txt_setting"        
                       android:layout_width="match_parent"        
                       android:layout_height="wrap_content" />

</RelativeLayout>








2.UserSettingActivity.java

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


/res/xml/settings.xml

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


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

    <PreferenceCategory android:title="user_pref" >
           <EditTextPreference            
                       android:title="key1_title"            
                       android:key="key1"            
                       android:summary="key1_summary"/>    
    </PreferenceCategory>


    <PreferenceCategory android:title="update_setting" >  


      


           <CheckBoxPreference            


                    android:title="key2_title"            


                    android:key="key2"            


                    android:defaultValue="true"            


                    android:summary="key2_summary" >        


            </CheckBoxPreference>
             <ListPreference            


                   android:title="key3_title"             


                   android:key="key3"            


                   android:entries="@array/key3_entries"            


                   android:entryValues="@array/key3_values"            


                   android:summary="key3_summary" /> 


     </PreferenceCategory>


</PreferenceScreen>

















Resource files





/res/values/arrays.xml




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


<resources>






    <string-array name="key3_entries">        


          <item name="1">one</item>        


          <item name="2">two</item>        


          <item name="3">three</item>    


    </string-array>



    <string-array name="key3_values">        


          <item name="1">one</item>        


          <item name="2">two</item>        


          <item name="3">three</item>    


    </string-array>




</resources>









/res/menu/settings.xml






<item    android:id="@+id/menu_settings"    


             android:orderInCategory="100"    


             android:showAsAction="never"    


             android:title="@string/menu_settings"    


             android:icon="@android:drawable/ic_menu_preferences"/>















Output file : /data/data/package_name/pref/pref.xml



<?xml version='1.0' encoding='utf-8' standalone='yes' ?>



<map>

   <string name="key1">ak1</string>

   <string name="key2">7</string>

   <boolean name="key3" value="true" />

</map>























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