how to update EditTextPreference existing summary when i click ok button

Question

I am able to show EditTextPreference with default summary. Now i want to update it when i enter new value in Edit Text box and click ok then it should be upadate the value of summary. But i am unable to do that. My code is below please update in my code which required.

public class Prefs extends PreferenceActivity {

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

    final EditTextPreference pref = (EditTextPreference)findPreference("username");
    pref.setSummary(pref.getText());
    pref.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
      public boolean onPreferenceChange(Preference preference, Object newValue) {
        final EditTextPreference pref = (EditTextPreference)findPreference("username");

        pref.setSummary(pref.getText());

        return true;
      }
    });
  }
}

xml file is

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
  <EditTextPreference 
    android:title="User Name"
    android:key="username" 
    android:summary="Please provide user name" />
  <EditTextPreference 
    android:title="Password" 
    android:password="true"
    android:key="password" 
    android:summary="Please enter your password" />
</PreferenceScreen>

actually my code update previous enter value as summary text. How to show text as summary when I click ok button. Thanks

Answer 1

You can implement this simply by subclassing EditTextPreference and overriding getSummary().

package com.example.yourapplication;

import android.content.Context;
import android.preference.EditTextPreference;
import android.text.TextUtils;
import android.util.AttributeSet;

public class FriendlyEditTextPreference extends EditTextPreference {

    public FriendlyEditTextPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public FriendlyEditTextPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FriendlyEditTextPreference(Context context) {
        super(context);
    }

    // According to ListPreference implementation
    @Override
    public CharSequence getSummary() {
        String text = getText();
        if (TextUtils.isEmpty(text)) {
            CharSequence hint = getEditText().getHint();
            if (!TextUtils.isEmpty(hint)) {
                return hint;
            } else {
                return super.getSummary();
            }
        } else {
            CharSequence summary = super.getSummary();
            if (!TextUtils.isEmpty(summary)) {
                return String.format(summary.toString(), text);
            } else {
                return summary;
            }
        }
    }
}

In your xml, replace EditTextPreference with com.example.yourapplication.FriendlyEditTextPreference

Now you can use string containing "%s" or "%1$s" as android:summary and it will update automatically; moreover, you can set andorid:hint so that the hint is also displayed when text is empty.

For A working ListPreference on all platforms, see my answer of this uestion