PreferenceActivity with custom functionality

Mon, 07/04/2011 - 06:28 | by gabor

SDK Version:

As we previously desribed in PreferenceActivity Basics a preferences screen with basic features can be done with minimal work, only using XML. Now we will inplement some functionality beyond the base ones, this will require some coding in addition to the XML definition.

We will display the actual value in each preferences summary field, like this:

The base XML will be the same as in the previous example, but we dont need to fill summary fields, they will be filled dinamically.

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
        android:title="Settings">
        <EditTextPreference android:title="Name"
                android:inputType="text"
                android:key="name" android:persistent="true" android:defaultValue="" />
               
        <EditTextPreference android:title="Password"
                android:inputType="textPassword"
                android:key="password" android:persistent="true" android:defaultValue="" />
 
        <CheckBoxPreference android:title="Auto login"
         android:key="autostart" android:defaultValue="true" />
</PreferenceScreen>

First when the Activity is created, we must dinamically set the summary fields starting value, like this:

Second, we must set a listener on each preference change, to update the value when it changes.
For this, the PreferenceActivity class will implement OnSharedPreferenceChangeListener and we will register the listener in onResume() and unregister it in onPause() and handle the changes in the onSharedPreferenceChangedlistener() method.

We take different actions depending on field type. For example we can not directly output the value of a checkbox, and we dont want to display passwords.

public class Settings extends PreferenceActivity implements
OnSharedPreferenceChangeListener {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    PreferenceManager.setDefaultValues(this, R.xml.settings, false);
    addPreferencesFromResource(R.xml.settings);
 
    SharedPreferences sp = getPreferenceScreen().getSharedPreferences();
 
    Preference name = (Preference) findPreference("name");
    name.setSummary(sp.getString("name", ""));
 
    Preference password = (Preference) findPreference("password");
    password.setSummary(sp.getString("password", "").replaceAll(".","*"));
           
    CheckBoxPreference autostart = (CheckBoxPreference) findPreference("autostart");
    if(autostart.isChecked())
      autostart.setSummary("On");
    else
      autostart.setSummary("Off");
  }
 
  @Override
  protected void onPause() {
    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
    finish();
    super.onPause();
  }
 
  protected void onResume() {
    super.onResume();
    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
  }
 
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
    Preference pref = findPreference(key);
    if (pref instanceof EditTextPreference) {
      EditTextPreference etp = (EditTextPreference) pref;
      if(pref.getKey().equals("password")){
        pref.setSummary(etp.getText().replaceAll(".","*"));
      }else{
         pref.setSummary(etp.getText());
      }
    }else if(pref instanceof CheckBoxPreference){
      if(((CheckBoxPreference)pref).isChecked())
      pref.setSummary("On");
    else
      pref.setSummary("Off");
    }
  }
}

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Add hints to preference

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Add hints to preference screen
android:hint="Enter Name"
android:hint="Enter Password"

Add strings to string.xml file
prefscreen_default_name with value Set your login name here
prefscreen_default_password with value Set your password here

public class Settings extends PreferenceActivity implements OnSharedPreferenceChangeListener
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
PreferenceManager.setDefaultValues(this, R.xml.preferencescreen, false);
addPreferencesFromResource(R.xml.preferencescreen);

// Instance
SharedPreferences sp = getPreferenceScreen().getSharedPreferences();
// Sets The Actual Entered Value or Default Defined string resource
// for android:summary in the res/xml/preferencescreen layout.
// Note: android:summary="..." is not defined in screen layout!

// findPreference("name") - references the android:key="name" in xml
Preference name = (Preference) findPreference("name");
// Get Default from resource file strings.xml
String smyDefault = getResources().getString(R.string.prefscreen_default_name);
// Get current preference settings value
String sValue = sp.getString("name", "");

if( sValue.equalsIgnoreCase( smyDefault ) || sValue.length() == 0 )
{
// Show Default
name.setSummary( smyDefault );
}
else
{
// Set Actual Value
name.setSummary(sp.getString("name", ""));
}

// Password
Preference password = (Preference) findPreference("password");
// Layout is defined in xml/preferencescreen.xml
// android:defaultValue="Set your password here"
// Get Default from resource file strings.xml
smyDefault = getResources().getString(R.string.prefscreen_default_password);
// Get current preference settings value
sValue = sp.getString("password", "");

if( sValue.equalsIgnoreCase( smyDefault ) || sValue.length() == 0 )
{
// Show Default - Do not hide value with Asterisks "*"
// You need to be able to read this default text
password.setSummary( smyDefault );
}
else
{
// Replace found password value with Asterisks "*"
password.setSummary(sp.getString("password", "").replaceAll(".","*"));
}

// Get current checkbox preference settings value
CheckBoxPreference autostart = (CheckBoxPreference) findPreference("autostart");
if(autostart.isChecked())
{
autostart.setSummary("On");
}
else
{
autostart.setSummary("Off");
}
}

@Override
protected void onPause() {
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
finish();
super.onPause();
}

protected void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
{
Preference pref = findPreference(key);
// EditTextPreference(s)
if (pref instanceof EditTextPreference)
{
EditTextPreference etp = (EditTextPreference) pref;

// Name
if(pref.getKey().equals("name"))
{
// Get Default from resource file strings.xml
String smyDefault = getResources().getString(R.string.prefscreen_default_name);
// Get current preference settings value
String sValue = etp.getText();

if( sValue.equalsIgnoreCase( smyDefault ) || sValue.length() == 0 )
{
// Show Default Value
pref.setSummary( smyDefault );
}
else
{
// Show current preference settings value
pref.setSummary(etp.getText());
}

}

// Password
if(pref.getKey().equals("password"))
{
// Get Default from resource file strings.xml
String smyDefault = getResources().getString(R.string.prefscreen_default_password);
// Get current preference settings value
String sValue = etp.getText();

if( sValue.equalsIgnoreCase( smyDefault ) || sValue.length() == 0 )
{
// Show Default Value - Do not hide with password "*"
pref.setSummary( smyDefault );
}
else
{
// Show current preference settings value
// Hide password value with Asterisks "*"
pref.setSummary(etp.getText().replaceAll(".","*"));
}

}

// CheckBoxPreference(s)
if(pref instanceof CheckBoxPreference)
{
if(((CheckBoxPreference)pref).isChecked())
{
pref.setSummary("On");
}
else
{
pref.setSummary("Off");
}

}

End --
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Add hints to preference

APC4U21 | Wed, 08/17/2011 - 16:29.

Add hints to preference screen
android:hint="Enter Name"
android:hint="Enter Password"

Add strings to string.xml file
prefscreen_default_name with value Set your login name here
prefscreen_default_password with value Set your password here

if( sValue.equalsIgnoreCase( smyDefault ) || sValue.length() == 0 )
{
// Show Default
name.setSummary( smyDefault );
}
else
{
// Set Actual Value
name.setSummary(sp.getString("name", ""));
}

@Override
protected void onPause() {
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
finish();
super.onPause();
}

protected void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}

}

// CheckBoxPreference(s)
if(pref instanceof CheckBoxPreference)
{
if(((CheckBoxPreference)pref).isChecked())
{
pref.setSummary("On");
}
else
{
pref.setSummary("Off");
}

}

End --

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PreferenceActivity with custom functionality

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