Android Preference Example

activity_main.xml

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity"     android:background="#e6f1e0"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Go To Settings"         />     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerInParent="true"         android:textSize="75dp"         /> </RelativeLayout> 

res/xml/preferences.xml

 <?xml version="1.0" encoding="utf-8"?> <PreferenceScreen     xmlns:android="http://schemas.android.com/apk/res/android"     >     <EditTextPreference         android:key="@string/sp_key_user_name"         android:title="Input your name"         />     <CheckBoxPreference         android:key="@string/sp_key_show_bold_text"         android:title="Display bold text?"         android:defaultValue="false"         android:summary="Select whether the app display bold text."         />     <CheckBoxPreference         android:key="@string/sp_key_show_red_text_color"         android:title="Display red color text?"         android:defaultValue="false"         /> </PreferenceScreen> 

res/values/strings.xml

 <resources>     <string name="app_name">Android Example - Preference</string>     <string name="title_activity_settings">Settings</string>     <string name="title_activity_main">Android Example - Preference</string>      <!-- SharedPreferences Keys -->     <string name="sp_key_show_bold_text">showBoldText</string>     <string name="sp_key_user_name">userName</string>     <string name="sp_key_show_red_text_color">showRedTextColor</string> </resources> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Color; import android.graphics.Typeface; import android.preference.PreferenceManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView;   public class MainActivity extends AppCompatActivity {     private Context mContext;     private Activity mActivity;      private RelativeLayout mRelativeLayout;     private Button mButton;     private TextView mTextView;      private SharedPreferences mSharedPreferences;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();          // Get the activity         mActivity = MainActivity.this;          // Get the instance of SharedPreferences object         mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);          // Get the widgets reference from XML layout         mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);         mButton = (Button) findViewById(R.id.btn);         mTextView = (TextView) findViewById(R.id.tv);          // Set a click listener for the text view         mButton.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 Intent intent = new Intent(mContext,SettingsActivity.class);                 startActivity(intent);             }         });          // Get the user's settings from SharedPreferences         String userName = mSharedPreferences.getString(getString(R.string.sp_key_user_name),"Guest");         boolean showBoldText = mSharedPreferences.getBoolean(getString(R.string.sp_key_show_bold_text), false);         boolean showRedTextColor = mSharedPreferences.getBoolean(getString(R.string.sp_key_show_red_text_color),false);          // If user preferred to show bold txt then make it bold         if(showBoldText){             mTextView.setTypeface(null, Typeface.BOLD);         }else {             mTextView.setTypeface(null,Typeface.NORMAL);         }          // Update the text with SharedPreferences         mTextView.setText("Hello " + userName);          // Display red color text based on user settings         if(showRedTextColor){             mTextView.setTextColor(Color.RED);         }else {             mTextView.setTextColor(Color.BLACK);         }     } } 

SettingsFragment.java

 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.preference.PreferenceFragment;  /*     PreferenceFragment         Shows a hierarchy of Preference objects as lists. These preferences will automatically save         to SharedPreferences as the user interacts with them. To retrieve an instance of         SharedPreferences that the preference hierarchy in this fragment will use, call         getDefaultSharedPreferences(android.content.Context) with a context in the same         package as this fragment. */ public class SettingsFragment extends PreferenceFragment {     @Override     public void onCreate(Bundle savedInstanceState){         super.onCreate(savedInstanceState);          /*             public void addPreferencesFromResource (int preferencesResId)                 Inflates the given XML resource and adds the preference hierarchy to the                 current preference hierarchy.              Parameters                 preferencesResId : The XML resource ID to inflate.         */         // Load the preferences from an XML resource         addPreferencesFromResource(R.xml.preferences);     } } 

SettingsActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.preference.PreferenceActivity;  /*     PreferenceActivity         This is the base class for an activity to show a hierarchy of preferences to the user.         Prior to HONEYCOMB this class only allowed the display of a single set of preference          This activity shows one or more headers of preferences, each of which is associated with a         PreferenceFragment to display the preferences of that header. The actual layout and display         of these associations can however vary; currently there are two major approaches it may take:              On a small screen it may display only the headers as a single list when first launched.             Selecting one of the header items will re-launch the activity with it only showing             the PreferenceFragment of that header.              On a large screen in may display both the headers and current PreferenceFragment             together as panes. Selecting a header item switches to showing the correct             PreferenceFragment for that item. */ public class SettingsActivity extends PreferenceActivity{     @Override     public void onCreate(Bundle savedInstanceState){         super.onCreate(savedInstanceState);          // Display the fragment as the main content         getFragmentManager().beginTransaction()                 .replace(android.R.id.content,new SettingsFragment()).commit();     } }