Add a simple setting android window activity23.04.22

Android FAQ: How do I create a Preferences UI in Android?

Solution: Creating a Preferences screen in Android isn’t too hard. The website rominirani.com has a very good preferences tutorial that just needs a minor update for Android 7, as a piece of the code shown there has been deprecated.

The steps to create an Android Preferences UI are:

Define the UI in XML, using a PreferenceScreen as the main component/container
    As an optional step, populate some Android string arrays to use with your preferences components
    Write a PreferenceActivity and PreferenceFragment in Java code to show/handle the UI

I add a few more steps in the code that follows, but those are the basic steps. (Please note that the following code is about 95% of iRomin’s code, and 5% updates for Android 7.)
1) The res/xml/preferences.xml file

Define your Preferences UI using a PreferenceScreen as the main container, and fill it with the sub-components needed for your preferences. Put this code in a file named res/xml/preferences.xml to get started:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
  <EditTextPreference android:title="Your Name"
                      android:key="username"
                      android:summary="Please provide your username"></EditTextPreference>
  <CheckBoxPreference android:title="Application Updates"
                      android:defaultValue="false"
                      android:summary="This option if selected will allow the application to check for latest versions."
                      android:key="applicationUpdates" />
  <ListPreference     android:title="Download Details"
                      android:summary="Select the kind of data that you would like to download"
                      android:key="downloadType"
                      android:defaultValue="1"
                      android:entries="@array/listArray"
                      android:entryValues="@array/listValues" />
</PreferenceScreen>

2) The res/values/array.xml file

iRomani’s code requires the following string array values, which he defines in a file named res/values/array.xml:

<resources>
<string-array name="listArray">
	<item>Headings</item>
	<item>Headings and Details</item>
	<item>All Data</item>
</string-array>

<string-array name="listValues">
    <item>1</item>
    <item>2</item>
    <item>3</item>
</string-array>
</resources>

(See my Android string array tutorial if you need to understand more about string arrays defined in XML.)
3) Your Android Preferences activity

The code here has been updated from iRomani’s tutorial, and contains the necessary corrections to work with Android 5, specifically using a PreferenceFragment along with the PreferenceActivity:

package com.alvinalexander.preferencestestapp;

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

public class MyPreferencesActivity extends PreferenceActivity {

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
    }

public static class MyPreferenceFragment extends PreferenceFragment
    {
        @Override
        public void onCreate(final Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.preferences);
        }
    }

}

4) Java code to launch the PreferenceActivity

You launch the PreferenceActivity just like any other Android Activity, with an Intent. This code shows that:

Intent i = new Intent(this, MyPreferencesActivity.class);
startActivity(i);

(The full source code for my “launcher” activity is shown down below, after the images.)
5) Saving/reading data

As iRomani discusses, you can save/read preferences data in other places of your application like this:

SharedPreferences SP = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String strUserName = SP.getString("username", "NA");
boolean bAppUpdates = SP.getBoolean("applicationUpdates",false);
String downloadType = SP.getString("downloadType","1");

As programming goes, that’s all you need to implement an Android Preferences screen. (For more information, please see that tutorial.)

https://alvinalexander.com/android/android-tutorial-preferencescreen-preferenceactivity-preferencefragment/

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Add a simple setting android window activity23.04.22

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