Android Preference Example

activity_main.xml

Drag one textview and two buttons from the pallete.

File: activity_main.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     xmlns:app="http://schemas.android.com/apk/res-auto"  
4.     xmlns:tools="http://schemas.android.com/tools"  
5.     android:layout_width="match_parent"  
6.     android:layout_height="match_parent"  
7.     tools:context="example.now.com.preferences.MainActivity">  
8.   
9.     <TextView  
10.         android:id="@+id/txtPrefs"  
11.         android:layout_width="wrap_content"  
12.         android:layout_height="wrap_content"  
13.         android:layout_centerVertical="true"  
14.         android:text="Data:" />  
15.   
16.     <Button  
17.         android:id="@+id/storeinformation"  
18.         android:layout_width="wrap_content"  
19.         android:layout_height="wrap_content"  
20.         android:layout_below="@+id/showinformation"  
21.         android:layout_centerHorizontal="true"  
22.         android:layout_marginTop="18dp"  
23.         android:text="Store Information" />  
24.   
25.     <Button  
26.         android:id="@+id/showinformation"  
27.         android:layout_width="wrap_content"  
28.         android:layout_height="wrap_content"  
29.         android:layout_alignParentTop="true"  
30.         android:layout_centerHorizontal="true"  
31.         android:layout_marginTop="17dp"  
32.         android:text="Show Information" />  
33.   
34. </RelativeLayout>  

array.xml

It is created inside res/values directory.

File: array.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <resources>  
3.     <string-array name="listOptions">  
4.         <item>English</item>  
5.         <item>Urdu</item>  
6.         <item>Other</item>  
7.     </string-array>  
8.   
9.     <string-array name="listValues">  
10.         <item>English Language</item>  
11.         <item>Urdu Language</item>  
12.         <item>Other Language</item>  
13.     </string-array>  
14. </resources>  

prefs.xml

It is created inside res/xml directory.

File: prefs.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">  
3.     <PreferenceCategory  
4.         android:summary="Username and password information"  
5.         android:title="Login information" >  
6.         <EditTextPreference  
7.             android:key="username"  
8.             android:summary="Please enter your login username"  
9.             android:title="Username" />  
10.         <EditTextPreference  
11.             android:key="password"  
12.             android:summary="Enter your password"  
13.             android:title="Password" />  
14.     </PreferenceCategory>  
15.   
16.     <PreferenceCategory  
17.         android:summary="Username and password information"  
18.         android:title="Settings" >  
19.         <CheckBoxPreference  
20.             android:key="checkBox"  
21.             android:summary="On/Off"  
22.             android:title="Keep me logged in" />  
23.   
24.         <ListPreference  
25.             android:entries="@array/listOptions"  
26.             android:entryValues="@array/listValues"  
27.             android:key="listpref"  
28.             android:summary="List preference example"  
29.             android:title="List preference" />  
30.     </PreferenceCategory>  
31. </PreferenceScreen>  

---

Main Activity Class

File: MainActivity.java

1. package example.now.com.preferences;  
2.   
3. import android.content.Intent;  
4. import android.content.SharedPreferences;  
5. import android.preference.PreferenceManager;  
6. import android.support.v7.app.AppCompatActivity;  
7. import android.os.Bundle;  
8. import android.view.View;  
9. import android.widget.Button;  
10. import android.widget.TextView;  
11.   
12. public class MainActivity extends AppCompatActivity {  
13.     TextView textView;  
14.     @Override  
15.     protected void onCreate(Bundle savedInstanceState) {  
16.         super.onCreate(savedInstanceState);  
17.         setContentView(R.layout.activity_main);  
18.   
19.         Button storeinformation = (Button) findViewById(R.id.storeinformation);  
20.         Button showinformation = (Button) findViewById(R.id.showinformation);  
21.         textView = (TextView) findViewById(R.id.txtPrefs);  
22.   
23.         View.OnClickListener listener = new View.OnClickListener() {  
24.             @Override  
25.             public void onClick(View v) {  
26.                 switch (v.getId()) {  
27.                     case R.id.storeinformation:  
28.                         Intent intent = new Intent(MainActivity.this,PrefsActivity.class);  
29.                         startActivity(intent);  
30.                         break;  
31.                     case R.id.showinformation:  
32.                         displaySharedPreferences();  
33.                         break;  
34.                     default:  
35.                         break;  
36.                 }  
37.             }  
38.         };  
39.         storeinformation.setOnClickListener(listener);  
40.         showinformation.setOnClickListener(listener);  
41.     }  
42.   
43.   
44.     private void displaySharedPreferences() {  
45.         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);  
46.         String username = prefs.getString("username", "Default NickName");  
47.         String passw = prefs.getString("password", "Default Password");  
48.         boolean checkBox = prefs.getBoolean("checkBox", false);  
49.         String listPrefs = prefs.getString("listpref", "Default list prefs");  
50.   
51.   
52.         StringBuilder builder = new StringBuilder();  
53.         builder.append("Username: " + username + "\n");  
54.         builder.append("Password: " + passw + "\n");  
55.         builder.append("Keep me logged in: " + String.valueOf(checkBox) + "\n");  
56.         builder.append("List preference: " + listPrefs);  
57.         textView.setText(builder.toString());  
58.   
59.     }  
60.   
61. }  

PrefsActivity class

File: PrefsActivity.java

1. package example.now.com.preferences;  
2.   
3. import android.os.Bundle;  
4. import android.preference.PreferenceActivity;  
5.   
6. public class PrefsActivity extends PreferenceActivity {  
7.     @Override  
8.     protected void onCreate(Bundle savedInstanceState) {  
9.         super.onCreate(savedInstanceState);  
10.         addPreferencesFromResource(R.xml.prefs);  
11.     }  
12. }  

AndroidManifest.xml

File: AndroidManifest.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"  
3.     package="example.now.com.preferences">  
4.   
5.     <application  
6.         android:allowBackup="true"  
7.         android:icon="@mipmap/ic_launcher"  
8.         android:label="@string/app_name"  
9.         android:roundIcon="@mipmap/ic_launcher_round"  
10.         android:supportsRtl="true"  
11.         android:theme="@style/AppTheme">  
12.         <activity android:name=".MainActivity">  
13.             <intent-filter>  
14.                 <action android:name="android.intent.action.MAIN" />  
15.   
16.                 <category android:name="android.intent.category.LAUNCHER" />  
17.             </intent-filter>  
18.         </activity>  
19.         <activity  android:name=".PrefsActivity"  
20.             android:theme="@android:style/Theme.Black.NoTitleBar" >  
21.         </activity>  
22.     </application>  
23.   
24. </manifest>