Add frequency band control in UI

Change-Id: I5a9fa46af358f363b2fe80a8ba7599d13dea5eb7

res/values/arrays.xml

@@ -318,6 +318,28 @@
         <item>2</item>
     </string-array>
 
+    <!-- Wi-Fi settings. Presented as a list dialog to the user to choose the Wi-Fi frequency band. -->
+    <string-array name="wifi_frequency_band_entries">
+        <!-- Operation on both 2.4 GHz and 5 GHz [CHAR LIMIT=25]-->
+        <item>Auto</item>
+        <!-- Operation on 5 GHz alone [CHAR LIMIT=25]-->
+        <item>5 GHz only</item>
+        <!-- Operation on 2.4 GHz alone [CHAR LIMIT=25]-->
+        <item>2.4 GHz only</item>
+    </string-array>
+
+    <!-- Match with wifi_frequency_band_entries and the values of the settings in WifiManager. -->
+    <!-- Do not translate. -->
+    <string-array name="wifi_frequency_band_values">
+        <!-- Do not translate. -->
+        <item>0</item>
+        <!-- Do not translate. -->
+        <item>1</item>
+        <!-- Do not translate. -->
+        <item>2</item>
+    </string-array>
+
+
     <!-- Display options for UsageStats class -->
     <string-array name="usage_stats_display_order_types">
         <item>Usage Time</item>

res/values/strings.xml

@@ -1025,6 +1025,12 @@
     <string name="wifi_setting_sleep_policy_summary">Specify when to switch from Wi-Fi to mobile data</string>
     <!-- Wi-Fi settings screen, generic error message when the sleep policy could not be set. -->
     <string name="wifi_setting_sleep_policy_error">There was a problem setting the sleep policy.</string>
+    <!-- Wi-Fi settings screen, setting title for setting the band [CHAR LIMIT=50]-->
+    <string name="wifi_setting_frequency_band_title">Wi-Fi frequency band</string>
+    <!-- Wi-Fi settings screen, setting summary for setting the wifi frequency band [CHAR LIMIT=50]-->
+    <string name="wifi_setting_frequency_band_summary">Specify the frequency range of operation</string>
+    <!-- Wi-Fi settings screen, error message when the frequency band could not be set [CHAR LIMIT=50]. -->
+    <string name="wifi_setting_frequency_band_error">There was a problem setting the frequency band.</string>
     <!-- Wi-Fi settings screen, advanced, title of the item to show the Wi-Fi device's MAC address. -->
     <string name="wifi_advanced_mac_address_title">MAC address</string>
     <!-- Title of the screen to adjust IP settings -->

res/xml/wifi_advanced_settings.xml

@@ -25,6 +25,15 @@
             android:entries="@array/wifi_sleep_policy_entries"
             android:entryValues="@array/wifi_sleep_policy_values"
             />
+
+    <ListPreference
+            android:key="frequency_band"
+            android:title="@string/wifi_setting_frequency_band_title"
+            android:summary="@string/wifi_setting_frequency_band_summary"
+            android:persistent="false"
+            android:entries="@array/wifi_frequency_band_entries"
+            android:entryValues="@array/wifi_frequency_band_values"
+            />
     
     <Preference android:key="mac_address" 
         style="?android:attr/preferenceInformationStyle" 

src/com/android/settings/wifi/AdvancedSettings.java

@@ -20,6 +20,7 @@ import com.android.settings.R;
 import com.android.settings.SettingsPreferenceFragment;
 
 import android.app.Activity;
+import android.content.Context;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.os.Bundle;
@@ -29,13 +30,18 @@ import android.preference.Preference;
 import android.provider.Settings;
 import android.text.TextUtils;
 import android.widget.Toast;
+import android.util.Log;
 
 public class AdvancedSettings extends SettingsPreferenceFragment
         implements Preference.OnPreferenceChangeListener {
 
+    private static final String TAG = "AdvancedSettings";
     private static final String KEY_MAC_ADDRESS = "mac_address";
     private static final String KEY_CURRENT_IP_ADDRESS = "current_ip_address";
     private static final String KEY_SLEEP_POLICY = "sleep_policy";
+    private static final String KEY_FREQUENCY_BAND = "frequency_band";
+
+    private WifiManager mWifiManager;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -46,22 +52,36 @@ public class AdvancedSettings extends SettingsPreferenceFragment
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
+        mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
     }
 
     @Override
     public void onResume() {
         super.onResume();
-
+        initPreferences();
-        initSleepPolicyPreference();
         refreshWifiInfo();
     }
 
-    private void initSleepPolicyPreference() {
+    private void initPreferences() {
         ListPreference pref = (ListPreference) findPreference(KEY_SLEEP_POLICY);
         pref.setOnPreferenceChangeListener(this);
         int value = Settings.System.getInt(getContentResolver(),
-                Settings.System.WIFI_SLEEP_POLICY,Settings. System.WIFI_SLEEP_POLICY_DEFAULT);
+                Settings.System.WIFI_SLEEP_POLICY, Settings.System.WIFI_SLEEP_POLICY_DEFAULT);
         pref.setValue(String.valueOf(value));
+
+        pref = (ListPreference) findPreference(KEY_FREQUENCY_BAND);
+
+        if (mWifiManager.isDualBandSupported()) {
+            pref.setOnPreferenceChangeListener(this);
+            value = mWifiManager.getFrequencyBand();
+            if (value != -1) {
+                pref.setValue(String.valueOf(value));
+            } else {
+                Log.e(TAG, "Failed to fetch frequency band");
+            }
+        } else {
+            getPreferenceScreen().removePreference(pref);
+        }
     }
 
     public boolean onPreferenceChange(Preference preference, Object newValue) {
@@ -77,14 +97,21 @@ public class AdvancedSettings extends SettingsPreferenceFragment
                         Toast.LENGTH_SHORT).show();
                 return false;
             }
+        } else if (key.equals(KEY_FREQUENCY_BAND)) {
+            try {
+                mWifiManager.setFrequencyBand(Integer.parseInt(((String) newValue)), true);
+            } catch (NumberFormatException e) {
+                Toast.makeText(getActivity(), R.string.wifi_setting_frequency_band_error,
+                        Toast.LENGTH_SHORT).show();
+                return false;
+            }
         }
 
         return true;
     }
 
     private void refreshWifiInfo() {
-        WifiManager wifiManager = (WifiManager) getSystemService(Activity.WIFI_SERVICE);
+        WifiInfo wifiInfo = mWifiManager.getConnectionInfo();
-        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
 
         Preference wifiMacAddressPref = findPreference(KEY_MAC_ADDRESS);
         String macAddress = wifiInfo == null ? null : wifiInfo.getMacAddress();