Airplane Mode in Emergency Callback Mode (ECM)

When user tries to change Airplane Mode between ON & OFF
in ECM mode, a notice should be shown to indicate it's in ECM mode,
and ask if user wants to exit ECM, if yes, then the Airplane Mode
is changed after ECM mode exit. If not, Airplane Mode should not be
changed.

src/com/android/settings/AirplaneModeEnabler.java

@@ -22,11 +22,14 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Handler;
 import android.os.Message;
+import android.os.SystemProperties;
 import android.preference.CheckBoxPreference;
 import android.preference.Preference;
 import android.provider.Settings;
 import android.telephony.ServiceState;
 
+import com.android.internal.telephony.TelephonyProperties;
+
 public class AirplaneModeEnabler implements Preference.OnPreferenceChangeListener {
 
     private final Context mContext;
@@ -111,8 +114,23 @@ public class AirplaneModeEnabler implements Preference.OnPreferenceChangeListene
      * Called when someone clicks on the checkbox preference.
      */
     public boolean onPreferenceChange(Preference preference, Object newValue) {
-        setAirplaneModeOn((Boolean) newValue);
+        if (Boolean.parseBoolean(
+                    SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
+            // In ECM mode, do not update database at this point
+        } else {
+            setAirplaneModeOn((Boolean) newValue);
+        }
         return true;
     }
 
+    public void setAirplaneModeInECM(boolean isECMExit, boolean isAirplaneModeOn) {
+        if (isECMExit) {
+            // update database based on the current checkbox state
+            setAirplaneModeOn(isAirplaneModeOn);
+        } else {
+            // update checkbox state based on database value
+            onAirplaneModeChanged();
+        }
+    }
+
 }

src/com/android/settings/WirelessSettings.java

@@ -19,13 +19,19 @@ package com.android.settings;
 import com.android.settings.bluetooth.BluetoothEnabler;
 import com.android.settings.wifi.WifiEnabler;
 
+import android.content.Intent;
 import android.net.wifi.WifiManager;
 import android.os.Bundle;
+import android.os.SystemProperties;
 import android.preference.CheckBoxPreference;
 import android.preference.Preference;
+import android.preference.PreferenceScreen;
 import android.preference.PreferenceActivity;
 import android.provider.Settings;
 
+import com.android.internal.telephony.TelephonyIntents;
+import com.android.internal.telephony.TelephonyProperties;
+
 public class WirelessSettings extends PreferenceActivity {
 
     private static final String KEY_TOGGLE_AIRPLANE = "toggle_airplane";
@@ -33,10 +39,36 @@ public class WirelessSettings extends PreferenceActivity {
     private static final String KEY_TOGGLE_WIFI = "toggle_wifi";
     private static final String KEY_WIFI_SETTINGS = "wifi_settings";
     private static final String KEY_VPN_SETTINGS = "vpn_settings";
+    public static final String EXIT_ECM_RESULT = "exit_ecm_result";
+    public static final int REQUEST_CODE_EXIT_ECM = 1;
 
     private WifiEnabler mWifiEnabler;
     private AirplaneModeEnabler mAirplaneModeEnabler;
     private BluetoothEnabler mBtEnabler;
+    private CheckBoxPreference mAirplaneModePreference;
+
+    /**
+     * Invoked on each preference click in this hierarchy, overrides
+     * PreferenceActivity's implementation.  Used to make sure we track the
+     * preference click events.
+     */
+    @Override
+    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
+        if ( (preference == mAirplaneModePreference) &&
+                (Boolean.parseBoolean(
+                    SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) ) {
+            // In ECM mode launch ECM app dialog
+            startActivityForResult(
+                new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null),
+                REQUEST_CODE_EXIT_ECM);
+
+            return true;
+        }
+        else {
+            // Let the intents be launched by the Preference manager
+            return false;
+        }
+    }
     
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -45,6 +77,7 @@ public class WirelessSettings extends PreferenceActivity {
         addPreferencesFromResource(R.xml.wireless_settings);
 
         initToggles();
+        mAirplaneModePreference = (CheckBoxPreference) findPreference(KEY_TOGGLE_AIRPLANE);
     }
     
     @Override
@@ -90,4 +123,20 @@ public class WirelessSettings extends PreferenceActivity {
         }
     }
 
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        switch(requestCode) {
+        case REQUEST_CODE_EXIT_ECM:
+            Boolean isChoiceYes =
+                data.getBooleanExtra(EXIT_ECM_RESULT, false);
+            // Set Airplane mode based on the return value and checkbox state
+            mAirplaneModeEnabler.setAirplaneModeInECM(isChoiceYes,
+                    mAirplaneModePreference.isChecked());
+            break;
+
+        default:
+            break;
+        }
+    }
+
 }