Implemented Shuffle feature #22, removed track cover from table #21, and started created the Settings Activity #14

.idea/Mear.iml

@@ -1,5 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module external.linked.project.id="Mear" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" type="JAVA_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="java-gradle" name="Java-Gradle">
+      <configuration>
+        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+        <option name="BUILDABLE" value="false" />
+      </configuration>
+    </facet>
+  </component>
   <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.example.mear">
 
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+
     <application
             android:allowBackup="true"
             android:icon="@mipmap/ic_launcher"
@@ -9,6 +11,14 @@
             android:roundIcon="@mipmap/ic_launcher_round"
             android:supportsRtl="true"
             android:theme="@style/AppTheme">
+        <activity
+                android:name=".SettingsActivity"
+                android:label="@string/title_activity_settings"
+                android:parentActivityName=".MainActivity">
+            <meta-data
+                    android:name="android.support.PARENT_ACTIVITY"
+                    android:value="com.example.mear.MainActivity"/>
+        </activity>
         <activity
                 android:name=".MainActivity"
                 android:label="@string/title_activity_main"
@@ -21,6 +31,4 @@
         </activity>
     </application>
 
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-
 </manifest>

app/src/main/java/com/example/mear/AppCompatPreferenceActivity.kt

@@ -0,0 +1,90 @@
+package com.example.mear
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.preference.PreferenceActivity
+import android.support.annotation.LayoutRes
+import android.support.v7.app.ActionBar
+import android.support.v7.app.AppCompatDelegate
+import android.support.v7.widget.Toolbar
+import android.view.MenuInflater
+import android.view.View
+import android.view.ViewGroup
+
+/**
+ * A [android.preference.PreferenceActivity] which implements and proxies the necessary calls
+ * to be used with AppCompat.
+ */
+abstract class AppCompatPreferenceActivity : PreferenceActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        delegate.installViewFactory()
+        delegate.onCreate(savedInstanceState)
+        super.onCreate(savedInstanceState)
+    }
+
+    override fun onPostCreate(savedInstanceState: Bundle?) {
+        super.onPostCreate(savedInstanceState)
+        delegate.onPostCreate(savedInstanceState)
+    }
+
+    val supportActionBar: ActionBar?
+        get() = delegate.supportActionBar
+
+    fun setSupportActionBar(toolbar: Toolbar?) {
+        delegate.setSupportActionBar(toolbar)
+    }
+
+    override fun getMenuInflater(): MenuInflater {
+        return delegate.menuInflater
+    }
+
+    override fun setContentView(@LayoutRes layoutResID: Int) {
+        delegate.setContentView(layoutResID)
+    }
+
+    override fun setContentView(view: View) {
+        delegate.setContentView(view)
+    }
+
+    override fun setContentView(view: View, params: ViewGroup.LayoutParams) {
+        delegate.setContentView(view, params)
+    }
+
+    override fun addContentView(view: View, params: ViewGroup.LayoutParams) {
+        delegate.addContentView(view, params)
+    }
+
+    override fun onPostResume() {
+        super.onPostResume()
+        delegate.onPostResume()
+    }
+
+    override fun onTitleChanged(title: CharSequence, color: Int) {
+        super.onTitleChanged(title, color)
+        delegate.setTitle(title)
+    }
+
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        delegate.onConfigurationChanged(newConfig)
+    }
+
+    override fun onStop() {
+        super.onStop()
+        delegate.onStop()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        delegate.onDestroy()
+    }
+
+    override fun invalidateOptionsMenu() {
+        delegate.invalidateOptionsMenu()
+    }
+
+    private val delegate: AppCompatDelegate by lazy {
+        AppCompatDelegate.create(this, null)
+    }
+}

app/src/main/java/com/example/mear/MainActivity.kt

@@ -1,6 +1,5 @@
 package com.example.mear
 
-import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.media.MediaPlayer
 import android.media.MediaMetadataRetriever
@@ -49,6 +48,9 @@ class MainActivity : AppCompatActivity() {
         PreviousTrack.setOnClickListener {
             playPreviousSongTrack()
         }
+        ShuffleTracks.setOnClickListener {
+            toggleShuffle()
+        }
     }
     private fun initializeCompletionListener() {
         trackPlayer!!.setOnCompletionListener {
@@ -65,6 +67,26 @@ class MainActivity : AppCompatActivity() {
         }
     }
 
+    private fun toggleShuffle() {
+        val shuffleText = ShuffleTracks.text.toString()
+        val on = getString(R.string.shuffle_on)
+        val off = getString(R.string.shuffle_off)
+        when (shuffleText) {
+            on -> {
+                shuffleOn = false
+                ShuffleTracks.setText(R.string.shuffle_off)
+            }
+            off -> {
+                shuffleOn = true
+                ShuffleTracks.setText(R.string.shuffle_on)
+            }
+            else -> {
+                shuffleOn = false
+                ShuffleTracks.setText(R.string.shuffle_off)
+            }
+        }
+    }
+
     private fun playSongTrack() {
         PlayTrack.isEnabled = true
         try {
@@ -156,7 +178,12 @@ class MainActivity : AppCompatActivity() {
                 PlayTypes.PlayPreviousSong -> {
                     songIndex = songCount
                     if (currentSong!! != 0) {
-                        songIndex = currentSong!!.dec()
+                        if (!shuffleOn!!) {
+                            songIndex = currentSong!!.dec()
+                        }
+                        else {
+                            songIndex = Random.nextInt(0, songCount!!)
+                        }
                     }
                 }
                 PlayTypes.PlaySong -> {
@@ -165,7 +192,12 @@ class MainActivity : AppCompatActivity() {
                 PlayTypes.PlayNextSong -> {
                     songIndex = 0
                     if (currentSong!! != songCount!!) {
-                        songIndex = currentSong!!.inc()
+                        if (!shuffleOn!!) {
+                            songIndex = currentSong!!.inc()
+                        }
+                        else {
+                            songIndex = Random.nextInt(0, songCount!!)
+                        }
                     }
                 }
             }
@@ -204,6 +236,7 @@ class MainActivity : AppCompatActivity() {
     private var trackPlayer: MediaPlayer? = null
     private var currentSong: Int? = null
     private var playerInitialized: Boolean? = null
+    private var shuffleOn: Boolean? = null
     private var songCount: Int? = null
 
     private enum class PlayTypes {

app/src/main/java/com/example/mear/SettingsActivity.kt

@@ -0,0 +1,252 @@
+package com.example.mear
+
+import android.annotation.TargetApi
+import android.content.Context
+import android.content.Intent
+import android.content.res.Configuration
+import android.media.RingtoneManager
+import android.net.Uri
+import android.os.Build
+import android.os.Bundle
+import android.preference.ListPreference
+import android.preference.Preference
+import android.preference.PreferenceActivity
+import android.preference.PreferenceFragment
+import android.preference.PreferenceManager
+import android.preference.RingtonePreference
+import android.text.TextUtils
+import android.view.MenuItem
+import android.support.v4.app.NavUtils
+
+/**
+ * A [PreferenceActivity] that presents a set of application settings. On
+ * handset devices, settings are presented as a single list. On tablets,
+ * settings are split by category, with category headers shown to the left of
+ * the list of settings.
+ *
+ * See [Android Design: Settings](http://developer.android.com/design/patterns/settings.html)
+ * for design guidelines and the [Settings API Guide](http://developer.android.com/guide/topics/ui/settings.html)
+ * for more information on developing a Settings UI.
+ */
+class SettingsActivity : AppCompatPreferenceActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setupActionBar()
+    }
+
+    /**
+     * Set up the [android.app.ActionBar], if the API is available.
+     */
+    private fun setupActionBar() {
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+
+    override fun onMenuItemSelected(featureId: Int, item: MenuItem): Boolean {
+        val id = item.itemId
+        if (id == android.R.id.home) {
+            if (!super.onMenuItemSelected(featureId, item)) {
+                NavUtils.navigateUpFromSameTask(this)
+            }
+            return true
+        }
+        return super.onMenuItemSelected(featureId, item)
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    override fun onIsMultiPane(): Boolean {
+        return isXLargeTablet(this)
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+    override fun onBuildHeaders(target: List<PreferenceActivity.Header>) {
+        loadHeadersFromResource(R.xml.pref_headers, target)
+    }
+
+    /**
+     * This method stops fragment injection in malicious applications.
+     * Make sure to deny any unknown fragments here.
+     */
+    override fun isValidFragment(fragmentName: String): Boolean {
+        return PreferenceFragment::class.java.name == fragmentName
+                || GeneralPreferenceFragment::class.java.name == fragmentName
+                || DataSyncPreferenceFragment::class.java.name == fragmentName
+                || NotificationPreferenceFragment::class.java.name == fragmentName
+    }
+
+    /**
+     * This fragment shows general preferences only. It is used when the
+     * activity is showing a two-pane settings UI.
+     */
+    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+    class GeneralPreferenceFragment : PreferenceFragment() {
+        override fun onCreate(savedInstanceState: Bundle?) {
+            super.onCreate(savedInstanceState)
+            addPreferencesFromResource(R.xml.pref_general)
+            setHasOptionsMenu(true)
+
+            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
+            // to their values. When their values change, their summaries are
+            // updated to reflect the new value, per the Android Design
+            // guidelines.
+            bindPreferenceSummaryToValue(findPreference("example_text"))
+            bindPreferenceSummaryToValue(findPreference("example_list"))
+        }
+
+        override fun onOptionsItemSelected(item: MenuItem): Boolean {
+            val id = item.itemId
+            if (id == android.R.id.home) {
+                startActivity(Intent(activity, SettingsActivity::class.java))
+                return true
+            }
+            return super.onOptionsItemSelected(item)
+        }
+    }
+
+    /**
+     * This fragment shows notification preferences only. It is used when the
+     * activity is showing a two-pane settings UI.
+     */
+    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+    class NotificationPreferenceFragment : PreferenceFragment() {
+        override fun onCreate(savedInstanceState: Bundle?) {
+            super.onCreate(savedInstanceState)
+            addPreferencesFromResource(R.xml.pref_notification)
+            setHasOptionsMenu(true)
+
+            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
+            // to their values. When their values change, their summaries are
+            // updated to reflect the new value, per the Android Design
+            // guidelines.
+            bindPreferenceSummaryToValue(findPreference("notifications_new_message_ringtone"))
+        }
+
+        override fun onOptionsItemSelected(item: MenuItem): Boolean {
+            val id = item.itemId
+            if (id == android.R.id.home) {
+                startActivity(Intent(activity, SettingsActivity::class.java))
+                return true
+            }
+            return super.onOptionsItemSelected(item)
+        }
+    }
+
+    /**
+     * This fragment shows data and sync preferences only. It is used when the
+     * activity is showing a two-pane settings UI.
+     */
+    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
+    class DataSyncPreferenceFragment : PreferenceFragment() {
+        override fun onCreate(savedInstanceState: Bundle?) {
+            super.onCreate(savedInstanceState)
+            addPreferencesFromResource(R.xml.pref_data_sync)
+            setHasOptionsMenu(true)
+
+            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
+            // to their values. When their values change, their summaries are
+            // updated to reflect the new value, per the Android Design
+            // guidelines.
+            bindPreferenceSummaryToValue(findPreference("sync_frequency"))
+        }
+
+        override fun onOptionsItemSelected(item: MenuItem): Boolean {
+            val id = item.itemId
+            if (id == android.R.id.home) {
+                startActivity(Intent(activity, SettingsActivity::class.java))
+                return true
+            }
+            return super.onOptionsItemSelected(item)
+        }
+    }
+
+    companion object {
+
+        /**
+         * A preference value change listener that updates the preference's summary
+         * to reflect its new value.
+         */
+        private val sBindPreferenceSummaryToValueListener = Preference.OnPreferenceChangeListener { preference, value ->
+            val stringValue = value.toString()
+
+            if (preference is ListPreference) {
+                // For list preferences, look up the correct display value in
+                // the preference's 'entries' list.
+                val listPreference = preference
+                val index = listPreference.findIndexOfValue(stringValue)
+
+                // Set the summary to reflect the new value.
+                preference.setSummary(
+                    if (index >= 0)
+                        listPreference.entries[index]
+                    else
+                        null
+                )
+
+            } else if (preference is RingtonePreference) {
+                // For ringtone preferences, look up the correct display value
+                // using RingtoneManager.
+                if (TextUtils.isEmpty(stringValue)) {
+                    // Empty values correspond to 'silent' (no ringtone).
+                    preference.setSummary(R.string.pref_ringtone_silent)
+
+                } else {
+                    val ringtone = RingtoneManager.getRingtone(
+                        preference.getContext(), Uri.parse(stringValue)
+                    )
+
+                    if (ringtone == null) {
+                        // Clear the summary if there was a lookup error.
+                        preference.setSummary(null)
+                    } else {
+                        // Set the summary to reflect the new ringtone display
+                        // name.
+                        val name = ringtone.getTitle(preference.getContext())
+                        preference.setSummary(name)
+                    }
+                }
+
+            } else {
+                // For all other preferences, set the summary to the value's
+                // simple string representation.
+                preference.summary = stringValue
+            }
+            true
+        }
+
+        /**
+         * Helper method to determine if the device has an extra-large screen. For
+         * example, 10" tablets are extra-large.
+         */
+        private fun isXLargeTablet(context: Context): Boolean {
+            return context.resources.configuration.screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK >= Configuration.SCREENLAYOUT_SIZE_XLARGE
+        }
+
+        /**
+         * Binds a preference's summary to its value. More specifically, when the
+         * preference's value is changed, its summary (line of text below the
+         * preference title) is updated to reflect the value. The summary is also
+         * immediately updated upon calling this method. The exact display format is
+         * dependent on the type of preference.
+
+         * @see .sBindPreferenceSummaryToValueListener
+         */
+        private fun bindPreferenceSummaryToValue(preference: Preference) {
+            // Set the listener to watch for value changes.
+            preference.onPreferenceChangeListener = sBindPreferenceSummaryToValueListener
+
+            // Trigger the listener immediately with the preference's
+            // current value.
+            sBindPreferenceSummaryToValueListener.onPreferenceChange(
+                preference,
+                PreferenceManager
+                    .getDefaultSharedPreferences(preference.context)
+                    .getString(preference.key, "")
+            )
+        }
+    }
+}

app/src/main/java/com/example/mear/management/DatabaseManager.kt

@@ -28,8 +28,7 @@ class DatabaseManager(ctx: Context): ManagedSQLiteOpenHelper(ctx, "Mear",
                 "Track", true,
                 "Id" to INTEGER + PRIMARY_KEY + UNIQUE,
                 "Title" to TEXT, "Album" to TEXT, "Artist" to TEXT,
-                "Cover" to BLOB, "Duration" to INTEGER,
+                "Duration" to INTEGER, "FilePath" to TEXT
-                "FilePath" to TEXT
             )
             db!!.createTable(
                 "TrackCount", true,

app/src/main/java/com/example/mear/management/TrackManager.kt

@@ -26,20 +26,12 @@ class TrackManager(var allSongPath: MutableList<String>) {
                 val trackLenghStr = mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION)
                 trackLength = (trackLenghStr.toInt()/1000)
 
-                var art: ByteArray? = null
-                if (mmr.embeddedPicture==null) {
-                    art = ByteArray(0)
-                }
-                else {
-                    art = mmr.embeddedPicture
-                }
                 if (trackTitle == null || trackArtist == null || trackAlbum == null ||
                         trackLenghStr == null) {
-                    println("dd")
                 }
 
                 val track = Track(id, trackTitle, trackArtist, trackAlbum, trackLength,
-                    art!!, musicPath)
+                    ByteArray(0), musicPath)
                 dumpToDatabase(ctx, track)
                 id++
             }

app/src/main/java/com/example/mear/repositories/TrackRepository.kt

@@ -20,11 +20,10 @@ class TrackRepository(val context: Context) {
                     val artist = columns.getValue("Artist").toString()
                     val album = columns.getValue("Album").toString()
                     val duration = columns.getValue("Duration").toString().toInt()
-                    val cover = columns.getValue("Cover").toString().toByteArray()
                     val songPath = columns.getValue("FilePath").toString()
 
                     val track = Track(id.toString().toInt(), title.toString(),artist,album,
-                        duration,cover,songPath)
+                        duration, ByteArray(0),songPath)
                     tracks.add(track)
 
                     return track
@@ -41,11 +40,10 @@ class TrackRepository(val context: Context) {
                     val artist = columns.getValue("Artist").toString()
                     var album = columns.getValue("Album").toString()
                     val duration = columns.getValue("Duration").toString().toInt()
-                    var cover = columns.getValue("Cover").toString().toByteArray()
                     var filePath = columns.getValue("FilePath").toString()
 
                     val track = Track(id, title, artist, album, duration,
-                        cover, filePath)
+                        ByteArray(0), filePath)
 
                     return track
                 }
@@ -68,8 +66,7 @@ class TrackRepository(val context: Context) {
             "Album" to track.album,
             "Artist" to track.artist,
             "Duration" to track.length,
-            "FilePath" to track.songPath,
+            "FilePath" to track.songPath)
-            "Cover" to track.TrackCover)
     }
     fun createSongCount(songCount: Int) = context.database.use {
         insert("TrackCount",

app/src/main/res/drawable/ic_info_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zm1,15h-2v-6h2v6zm0,-8h-2V7h2v2z"/>
+</vector>

app/src/main/res/drawable/ic_notifications_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M11.5,22c1.1,0 2,-0.9 2,-2h-4c0,1.1 0.9,2 2,2zm6.5,-6v-5.5c0,-3.07 -2.13,-5.64 -5,-6.32V3.5c0,-0.83 -0.67,-1.5 -1.5,-1.5S10,2.67 10,3.5v0.68c-2.87,0.68 -5,3.25 -5,6.32V16l-2,2v1h17v-1l-2,-2z"/>
+</vector>

app/src/main/res/drawable/ic_sync_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M12 4V1L8 5l4 4V6c3.31 0 6 2.69 6 6 0 1.01,-.25 1.97,-.7 2.8l1.46 1.46C19.54 15.03 20 13.57 20 12c0,-4.42,-3.58,-8,-8,-8zm0 14c-3.31 0,-6,-2.69,-6,-6 0,-1.01.25,-1.97.7,-2.8L5.24 7.74C4.46 8.97 4 10.43 4 12c0 4.42 3.58 8 8 8v3l4,-4,-4,-4v3z"/>
+</vector>

app/src/main/res/layout/content_main.xml

@@ -16,7 +16,7 @@
             tools:layout_editor_absoluteX="0dp">
         <ImageView
                 tools:srcCompat="@tools:sample/backgrounds/scenic[2]"
-                android:id="@+id/TrackCover" android:layout_height="326dp"
+                android:id="@+id/TrackCover" android:layout_height="269dp"
                 android:layout_width="match_parent"/>
         <LinearLayout
                 android:orientation="vertical"
@@ -44,7 +44,7 @@
             <Button
                     android:text="Shuffle"
                     android:layout_height="wrap_content" android:id="@+id/ShuffleTracks" android:layout_weight="1"
-                    android:layout_width="1dp"/>
+                    android:layout_width="21dp"/>
             <Button
                     android:text="Repeat"
                     android:layout_height="wrap_content" android:id="@+id/RepeatList" android:layout_weight="1"

app/src/main/res/values/strings.xml

@@ -7,4 +7,80 @@
     <string name="nav_header_desc">Navigation header</string>
     <string name="action_settings">Settings</string>
     <string name="title_activity_main">MainActivity</string>
+
+    <string name="shuffle_on">Shuffle On</string>
+    <string name="shuffle_off">Shuffle Off</string>
+    <string name="title_activity_settings">Settings</string>
+
+    <!-- Strings related to Settings -->
+
+    <!-- Example General settings -->
+    <string name="pref_header_general">General</string>
+
+    <string name="pref_title_social_recommendations">Enable social recommendations</string>
+    <string name="pref_description_social_recommendations">Recommendations for people to contact based on your message
+        history
+    </string>
+
+    <string name="pref_title_display_name">Display name</string>
+    <string name="pref_default_display_name">John Smith</string>
+
+    <string name="pref_title_add_friends_to_messages">Add friends to messages</string>
+    <string-array name="pref_example_list_titles">
+        <item>Always</item>
+        <item>When possible</item>
+        <item>Never</item>
+    </string-array>
+    <string-array name="pref_example_list_values">
+        <item>1</item>
+        <item>0</item>
+        <item>-1</item>
+    </string-array>
+
+    <!-- Example settings for Data & Sync -->
+    <string name="pref_header_data_sync">Data &amp; sync</string>
+
+    <string name="pref_title_sync_frequency">Sync frequency</string>
+    <string-array name="pref_sync_frequency_titles">
+        <item>15 minutes</item>
+        <item>30 minutes</item>
+        <item>1 hour</item>
+        <item>3 hours</item>
+        <item>6 hours</item>
+        <item>Never</item>
+    </string-array>
+    <string-array name="pref_sync_frequency_values">
+        <item>15</item>
+        <item>30</item>
+        <item>60</item>
+        <item>180</item>
+        <item>360</item>
+        <item>-1</item>
+    </string-array>
+
+    <string-array name="list_preference_entries">
+        <item>Entry 1</item>
+        <item>Entry 2</item>
+        <item>Entry 3</item>
+    </string-array>
+
+    <string-array name="list_preference_entry_values">
+        <item>1</item>
+        <item>2</item>
+        <item>3</item>
+    </string-array>
+
+    <string-array name="multi_select_list_preference_default_value"/>
+
+    <string name="pref_title_system_sync_settings">System sync settings</string>
+
+    <!-- Example settings for Notifications -->
+    <string name="pref_header_notifications">Notifications</string>
+
+    <string name="pref_title_new_message_notifications">New message notifications</string>
+
+    <string name="pref_title_ringtone">Ringtone</string>
+    <string name="pref_ringtone_silent">Silent</string>
+
+    <string name="pref_title_vibrate">Vibrate</string>
 </resources>

app/src/main/res/xml/pref_data_sync.xml

@@ -0,0 +1,21 @@
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- NOTE: Hide buttons to simplify the UI. Users can touch outside the dialog to
+         dismiss it. -->
+    <!-- NOTE: ListPreference's summary should be set to its value by the activity code. -->
+    <ListPreference
+            android:key="sync_frequency"
+            android:title="@string/pref_title_sync_frequency"
+            android:entries="@array/pref_sync_frequency_titles"
+            android:entryValues="@array/pref_sync_frequency_values"
+            android:defaultValue="180"
+            android:negativeButtonText="@null"
+            android:positiveButtonText="@null"/>
+
+    <!-- This preference simply launches an intent when selected. Use this UI sparingly, per
+         design guidelines. -->
+    <Preference android:title="@string/pref_title_system_sync_settings">
+        <intent android:action="android.settings.SYNC_SETTINGS"/>
+    </Preference>
+
+</PreferenceScreen>

app/src/main/res/xml/pref_general.xml

@@ -0,0 +1,33 @@
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <SwitchPreference
+            android:key="example_switch"
+            android:title="@string/pref_title_social_recommendations"
+            android:summary="@string/pref_description_social_recommendations"
+            android:defaultValue="true"/>
+
+    <!-- NOTE: EditTextPreference accepts EditText attributes. -->
+    <!-- NOTE: EditTextPreference's summary should be set to its value by the activity code. -->
+    <EditTextPreference
+            android:key="example_text"
+            android:title="@string/pref_title_display_name"
+            android:defaultValue="@string/pref_default_display_name"
+            android:selectAllOnFocus="true"
+            android:inputType="textCapWords"
+            android:capitalize="words"
+            android:singleLine="true"
+            android:maxLines="1"/>
+
+    <!-- NOTE: Hide buttons to simplify the UI. Users can touch outside the dialog to
+         dismiss it. -->
+    <!-- NOTE: ListPreference's summary should be set to its value by the activity code. -->
+    <ListPreference
+            android:key="example_list"
+            android:title="@string/pref_title_add_friends_to_messages"
+            android:defaultValue="-1"
+            android:entries="@array/pref_example_list_titles"
+            android:entryValues="@array/pref_example_list_values"
+            android:negativeButtonText="@null"
+            android:positiveButtonText="@null"/>
+
+</PreferenceScreen>

app/src/main/res/xml/pref_headers.xml

@@ -0,0 +1,20 @@
+<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- These settings headers are only used on tablets. -->
+
+    <header
+            android:fragment="com.example.mear.SettingsActivity$GeneralPreferenceFragment"
+            android:title="@string/pref_header_general"
+            android:icon="@drawable/ic_info_black_24dp"/>
+
+    <header
+            android:fragment="com.example.mear.SettingsActivity$NotificationPreferenceFragment"
+            android:title="@string/pref_header_notifications"
+            android:icon="@drawable/ic_notifications_black_24dp"/>
+
+    <header
+            android:fragment="com.example.mear.SettingsActivity$DataSyncPreferenceFragment"
+            android:title="@string/pref_header_data_sync"
+            android:icon="@drawable/ic_sync_black_24dp"/>
+
+</preference-headers>

app/src/main/res/xml/pref_notification.xml

@@ -0,0 +1,27 @@
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- A 'parent' preference, which enables/disables child preferences (below)
+         when checked/unchecked. -->
+    <SwitchPreference
+            android:key="notifications_new_message"
+            android:title="@string/pref_title_new_message_notifications"
+            android:defaultValue="true"/>
+
+    <!-- Allows the user to choose a ringtone in the 'notification' category. -->
+    <!-- NOTE: This preference will be enabled only when the checkbox above is checked. -->
+    <!-- NOTE: RingtonePreference's summary should be set to its value by the activity code. -->
+    <RingtonePreference
+            android:dependency="notifications_new_message"
+            android:key="notifications_new_message_ringtone"
+            android:title="@string/pref_title_ringtone"
+            android:ringtoneType="notification"
+            android:defaultValue="content://settings/system/notification_sound"/>
+
+    <!-- NOTE: This preference will be enabled only when the checkbox above is checked. -->
+    <SwitchPreference
+            android:dependency="notifications_new_message"
+            android:key="notifications_new_message_vibrate"
+            android:title="@string/pref_title_vibrate"
+            android:defaultValue="true"/>
+
+</PreferenceScreen>