Wi-Fi: Manage Wi-Fi AP priorities

AOSP has a basic LRU priority for Wi-Fi networks (last connected has more priority).
This changes added the ability of graphically set the priority of any of the configured
Wi-Fi networks through Settings -> Wi-Fi -> Advanced Settings -> Wi-Fi priority.

Patchset 2: Move WiFiPriority from cyanogenmod folder to wifi folder
            Remove double quotes in SSID name
Patchset 3: Fixed code issues

Change-Id: Ief590e799cdb7ef760b631d0b22d9719f867393f
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>

2 files changed, 192 insertions, 0 deletions

diff --git a/src/com/android/settings/wifi/AdvancedWifiSettings.java b/src/com/android/settings/wifi/AdvancedWifiSettings.java
index 99b2f10..3777eb2 100644
--- a/src/com/android/settings/wifi/AdvancedWifiSettings.java
+++ b/src/com/android/settings/wifi/AdvancedWifiSettings.java
@@ -17,6 +17,7 @@
 package com.android.settings.wifi;
 
 import android.content.Context;
+import android.content.Intent;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.net.wifi.WifiWatchdogStateMachine;
@@ -47,6 +48,7 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
     private static final String KEY_SLEEP_POLICY = "sleep_policy";
     private static final String KEY_POOR_NETWORK_DETECTION = "wifi_poor_network_detection";
     private static final String KEY_SUSPEND_OPTIMIZATIONS = "suspend_optimizations";
+    private static final String KEY_WIFI_PRIORITY = "wifi_priority";
 
     private WifiManager mWifiManager;
 
@@ -135,6 +137,9 @@ public class AdvancedWifiSettings extends SettingsPreferenceFragment
             sleepPolicyPref.setValue(stringValue);
             updateSleepPolicySummary(sleepPolicyPref, stringValue);
         }
+
+        Preference wifiPriority = findPreference(KEY_WIFI_PRIORITY);
+        wifiPriority.setEnabled(mWifiManager.isWifiEnabled());
     }
 
     private void updateSleepPolicySummary(Preference sleepPolicyPref, String value) {
diff --git a/src/com/android/settings/wifi/WifiPriority.java b/src/com/android/settings/wifi/WifiPriority.java
new file mode 100644
index 0000000..74f997a
--- /dev/null
+++ b/src/com/android/settings/wifi/WifiPriority.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2013 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi;
+
+import android.app.ListFragment;
+import android.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.ListView;
+import android.widget.TextView;
+
+import com.android.settings.R;
+import com.android.settings.cyanogenmod.TouchInterceptor;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+public class WifiPriority extends ListFragment {
+
+    private final TouchInterceptor.DropListener mDropListener =
+            new TouchInterceptor.DropListener() {
+        public void drop(int from, int to) {
+            if (from == to) return;
+
+            // Sort networks by user selection
+            List<WifiConfiguration> mNetworks = mAdapter.getNetworks();
+            WifiConfiguration o = mNetworks.remove(from);
+            mNetworks.add(to, o);
+
+            // Set the new priorities of the networks
+            int cc = mNetworks.size();
+            for (int i = 0; i < cc; i++) {
+                WifiConfiguration network = mNetworks.get(i);
+                network.priority = cc - i;
+
+                // Update the priority
+                mWifiManager.updateNetwork(network);
+            }
+
+            // Now, save all the Wi-Fi configuration with its new priorities
+            mWifiManager.saveConfiguration();
+
+            // Reload the networks
+            mAdapter.reloadNetworks();
+            mNetworksListView.invalidateViews();
+        }
+    };
+
+    private WifiManager mWifiManager;
+    private TouchInterceptor mNetworksListView;
+    private WifiPriorityAdapter mAdapter;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.wifi_network_priority, null);
+    }
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        Context ctx = getActivity().getApplicationContext();
+        mWifiManager = (WifiManager)ctx.getSystemService(Context.WIFI_SERVICE);
+
+        // Set the touchable listview
+        mNetworksListView = (TouchInterceptor)getListView();
+        mNetworksListView.setDropListener(mDropListener);
+        mAdapter = new WifiPriorityAdapter(ctx, mWifiManager);
+        setListAdapter(mAdapter);
+    }
+
+    @Override
+    public void onDestroy() {
+        mNetworksListView.setDropListener(null);
+        setListAdapter(null);
+        super.onDestroy();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        // Reload the networks
+        mAdapter.reloadNetworks();
+        mNetworksListView.invalidateViews();
+    }
+
+    private class WifiPriorityAdapter extends BaseAdapter {
+
+        private final WifiManager mWifiManager;
+        private final LayoutInflater mInflater;
+        private List<WifiConfiguration> mNetworks;
+
+        public WifiPriorityAdapter(Context ctx, WifiManager wifiManager) {
+            mWifiManager = wifiManager;
+            mInflater = LayoutInflater.from(ctx);
+            reloadNetworks();
+        }
+
+        private void reloadNetworks() {
+            mNetworks = mWifiManager.getConfiguredNetworks();
+            if (mNetworks == null) {
+                mNetworks = new ArrayList<WifiConfiguration>();
+            }
+
+            // Sort network list by priority (or by network id if the priority is the same)
+            Collections.sort(mNetworks, new Comparator<WifiConfiguration>() {
+                @Override
+                public int compare(WifiConfiguration lhs, WifiConfiguration rhs) {
+                    // > priority -- > lower position
+                    if (lhs.priority < rhs.priority) return 1;
+                    if (lhs.priority > rhs.priority) return -1;
+                    // < network id -- > lower position
+                    if (lhs.networkId < rhs.networkId) return -1;
+                    if (lhs.networkId > rhs.networkId) return 1;
+                    return 0;
+                }
+            });
+        }
+
+        /**package**/ List<WifiConfiguration> getNetworks() {
+            return mNetworks;
+        }
+
+        @Override
+        public int getCount() {
+            return mNetworks.size();
+        }
+
+        @Override
+        public Object getItem(int position) {
+            return mNetworks.get(position);
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            final View v;
+            if (convertView == null) {
+                v = mInflater.inflate(R.layout.order_power_widget_button_list_item, null);
+            } else {
+                v = convertView;
+            }
+
+            WifiConfiguration network = (WifiConfiguration)getItem(position);
+
+            final TextView name = (TextView) v.findViewById(R.id.name);
+            // wpa_suplicant returns the SSID between double quotes. Remove them if are present.
+            name.setText(filterSSID(network.SSID));
+
+            return v;
+        }
+
+        private String filterSSID(String ssid) {
+            // Filter only if has start and end double quotes
+            if (ssid == null || !ssid.startsWith("\"") || !ssid.endsWith("\"")) {
+                return ssid;
+            }
+            return ssid.substring(1, ssid.length()-1);
+        }
+    }
+}