services/core/java/com/android/server/emergency/EmergencyAffordanceService.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2016 The Android Open Source 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.server.emergency;

 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
 import android.os.Message;
 import android.provider.Settings;
 import android.telephony.CellInfo;
 import android.telephony.CellInfoGsm;
 import android.telephony.CellInfoLte;
 import android.telephony.CellInfoWcdma;
 import android.telephony.CellLocation;
 import android.telephony.PhoneStateListener;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;

 import com.android.server.SystemService;

 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

 /**
  * A service that listens to connectivity and SIM card changes and determines if the emergency mode
  * should be enabled
  */
 public class EmergencyAffordanceService extends SystemService {

     private static final String TAG = "EmergencyAffordanceService";

     private static final int NUM_SCANS_UNTIL_ABORT = 4;

     private static final int INITIALIZE_STATE = 1;
     private static final int CELL_INFO_STATE_CHANGED = 2;
     private static final int SUBSCRIPTION_CHANGED = 3;

     /**
      * Global setting, whether the last scan of the sim cards reveal that a sim was inserted that
      * requires the emergency affordance. The value is a boolean (1 or 0).
      * @hide
      */
     private static final String EMERGENCY_SIM_INSERTED_SETTING = "emergency_sim_inserted_before";

     private final Context mContext;
     private final ArrayList<Integer> mEmergencyCallMccNumbers;

     private final Object mLock = new Object();

     private TelephonyManager mTelephonyManager;
     private SubscriptionManager mSubscriptionManager;
     private boolean mEmergencyAffordanceNeeded;
     private MyHandler mHandler;
     private int mScansCompleted;
     private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
         @Override
         public void onCellInfoChanged(List<CellInfo> cellInfo) {
             if (!isEmergencyAffordanceNeeded()) {
                 requestCellScan();
             }
         }

         @Override
         public void onCellLocationChanged(CellLocation location) {
             if (!isEmergencyAffordanceNeeded()) {
                 requestCellScan();
             }
         }
     };
     private BroadcastReceiver mAirplaneModeReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             if (Settings.Global.getInt(context.getContentResolver(),
                     Settings.Global.AIRPLANE_MODE_ON, 0) == 0) {
                 startScanning();
                 requestCellScan();
             }
         }
     };
     private boolean mSimNeedsEmergencyAffordance;
     private boolean mNetworkNeedsEmergencyAffordance;
     private boolean mVoiceCapable;

     private void requestCellScan() {
         mHandler.obtainMessage(CELL_INFO_STATE_CHANGED).sendToTarget();
     }

     private SubscriptionManager.OnSubscriptionsChangedListener mSubscriptionChangedListener
             = new SubscriptionManager.OnSubscriptionsChangedListener() {
         @Override
         public void onSubscriptionsChanged() {
             mHandler.obtainMessage(SUBSCRIPTION_CHANGED).sendToTarget();
         }
     };

     public EmergencyAffordanceService(Context context) {
         super(context);
         mContext = context;
         int[] numbers = context.getResources().getIntArray(
                 com.android.internal.R.array.config_emergency_mcc_codes);
         mEmergencyCallMccNumbers = new ArrayList<>(numbers.length);
         for (int i = 0; i < numbers.length; i++) {
             mEmergencyCallMccNumbers.add(numbers[i]);
         }
     }

     private void updateEmergencyAffordanceNeeded() {
         synchronized (mLock) {
             mEmergencyAffordanceNeeded = mVoiceCapable && (mSimNeedsEmergencyAffordance ||
                     mNetworkNeedsEmergencyAffordance);
             Settings.Global.putInt(mContext.getContentResolver(),
                     Settings.Global.EMERGENCY_AFFORDANCE_NEEDED,
                     mEmergencyAffordanceNeeded ? 1 : 0);
             if (mEmergencyAffordanceNeeded) {
                 stopScanning();
             }
         }
     }

     private void stopScanning() {
         synchronized (mLock) {
             mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
             mScansCompleted = 0;
         }
     }

     private boolean isEmergencyAffordanceNeeded() {
         synchronized (mLock) {
             return mEmergencyAffordanceNeeded;
         }
     }

     @Override
     public void onStart() {
     }

     @Override
     public void onBootPhase(int phase) {
         if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) {
             mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
             mVoiceCapable = mTelephonyManager.isVoiceCapable();
             if (!mVoiceCapable) {
                 updateEmergencyAffordanceNeeded();
                 return;
             }
             mSubscriptionManager = SubscriptionManager.from(mContext);
             HandlerThread thread = new HandlerThread(TAG);
             thread.start();
             mHandler = new MyHandler(thread.getLooper());
             mHandler.obtainMessage(INITIALIZE_STATE).sendToTarget();
             startScanning();
             IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
             mContext.registerReceiver(mAirplaneModeReceiver, filter);
             mSubscriptionManager.addOnSubscriptionsChangedListener(mSubscriptionChangedListener);
         }
     }

     private void startScanning() {
         mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CELL_INFO
                 | PhoneStateListener.LISTEN_CELL_LOCATION);
     }

     /** Handler to do the heavier work on */
     private class MyHandler extends Handler {

         public MyHandler(Looper l) {
             super(l);
         }

         @Override
         public void handleMessage(Message msg) {
             switch (msg.what) {
                 case INITIALIZE_STATE:
                     handleInitializeState();
                     break;
                 case CELL_INFO_STATE_CHANGED:
                     handleUpdateCellInfo();
                     break;
                 case SUBSCRIPTION_CHANGED:
                     handleUpdateSimSubscriptionInfo();
                     break;
             }
         }
     }

     private void handleInitializeState() {
         if (handleUpdateSimSubscriptionInfo()) {
             return;
         }
         if (handleUpdateCellInfo()) {
             return;
         }
         updateEmergencyAffordanceNeeded();
     }

     private boolean handleUpdateSimSubscriptionInfo() {
         boolean neededBefore = simNeededAffordanceBefore();
         boolean neededNow = neededBefore;
         List<SubscriptionInfo> activeSubscriptionInfoList =
                 mSubscriptionManager.getActiveSubscriptionInfoList();
         if (activeSubscriptionInfoList == null) {
             setSimNeedsEmergencyAffordance(neededNow);
             return neededNow;
         }
         for (SubscriptionInfo info : activeSubscriptionInfoList) {
             int mcc = info.getMcc();
             if (mccRequiresEmergencyAffordance(mcc)) {
                 neededNow = true;
                 break;
             } else if (mcc != 0 && mcc != Integer.MAX_VALUE){
                 // a Sim with a different mcc code was found
                 neededNow = false;
             }
             String simOperator  = mTelephonyManager.getSimOperator(info.getSubscriptionId());
             mcc = 0;
             if (simOperator != null && simOperator.length() >= 3) {
                 mcc = Integer.parseInt(simOperator.substring(0, 3));
             }
             if (mcc != 0) {
                 if (mccRequiresEmergencyAffordance(mcc)) {
                     neededNow = true;
                     break;
                 } else {
                     // a Sim with a different mcc code was found
                     neededNow = false;
                 }
             }
         }
         setSimNeedsEmergencyAffordance(neededNow);
         return neededNow;
     }

     private void setSimNeedsEmergencyAffordance(boolean simNeedsEmergencyAffordance) {
         if (simNeededAffordanceBefore() != simNeedsEmergencyAffordance) {
             Settings.Global.putInt(mContext.getContentResolver(),
                     EMERGENCY_SIM_INSERTED_SETTING,
                     simNeedsEmergencyAffordance ? 1 : 0);
         }
         if (simNeedsEmergencyAffordance != mSimNeedsEmergencyAffordance) {
             mSimNeedsEmergencyAffordance = simNeedsEmergencyAffordance;
             updateEmergencyAffordanceNeeded();
         }
     }

     private boolean simNeededAffordanceBefore() {
         return Settings.Global.getInt(mContext.getContentResolver(),
                 EMERGENCY_SIM_INSERTED_SETTING, 0) != 0;
     }

     private boolean handleUpdateCellInfo() {
         List<CellInfo> cellInfos = mTelephonyManager.getAllCellInfo();
         if (cellInfos == null) {
             return false;
         }
         boolean stopScanningAfterScan = false;
         for (CellInfo cellInfo : cellInfos) {
             int mcc = 0;
             if (cellInfo instanceof CellInfoGsm) {
                 mcc = ((CellInfoGsm) cellInfo).getCellIdentity().getMcc();
             } else if (cellInfo instanceof CellInfoLte) {
                 mcc = ((CellInfoLte) cellInfo).getCellIdentity().getMcc();
             } else if (cellInfo instanceof CellInfoWcdma) {
                 mcc = ((CellInfoWcdma) cellInfo).getCellIdentity().getMcc();
             }
             if (mccRequiresEmergencyAffordance(mcc)) {
                 setNetworkNeedsEmergencyAffordance(true);
                 return true;
             } else if (mcc != 0 && mcc != Integer.MAX_VALUE) {
                 // we found an mcc that isn't in the list, abort
                 stopScanningAfterScan = true;
             }
         }
         if (stopScanningAfterScan) {
             stopScanning();
         } else {
             onCellScanFinishedUnsuccessful();
         }
         setNetworkNeedsEmergencyAffordance(false);
         return false;
     }

     private void setNetworkNeedsEmergencyAffordance(boolean needsAffordance) {
         synchronized (mLock) {
             mNetworkNeedsEmergencyAffordance = needsAffordance;
             updateEmergencyAffordanceNeeded();
         }
     }

     private void onCellScanFinishedUnsuccessful() {
         synchronized (mLock) {
             mScansCompleted++;
             if (mScansCompleted >= NUM_SCANS_UNTIL_ABORT) {
                 stopScanning();
             }
         }
     }

     private boolean mccRequiresEmergencyAffordance(int mcc) {
         return mEmergencyCallMccNumbers.contains(mcc);
     }
 }
	/*
	* Copyright (C) 2016 The Android Open Source 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.server.emergency;

	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.os.Handler;
	import android.os.HandlerThread;
	import android.os.Looper;
	import android.os.Message;
	import android.provider.Settings;
	import android.telephony.CellInfo;
	import android.telephony.CellInfoGsm;
	import android.telephony.CellInfoLte;
	import android.telephony.CellInfoWcdma;
	import android.telephony.CellLocation;
	import android.telephony.PhoneStateListener;
	import android.telephony.SubscriptionInfo;
	import android.telephony.SubscriptionManager;
	import android.telephony.TelephonyManager;

	import com.android.server.SystemService;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;

	/**
	* A service that listens to connectivity and SIM card changes and determines if the emergency mode
	* should be enabled
	*/
	public class EmergencyAffordanceService extends SystemService {

	private static final String TAG = "EmergencyAffordanceService";

	private static final int NUM_SCANS_UNTIL_ABORT = 4;

	private static final int INITIALIZE_STATE = 1;
	private static final int CELL_INFO_STATE_CHANGED = 2;
	private static final int SUBSCRIPTION_CHANGED = 3;

	/**
	* Global setting, whether the last scan of the sim cards reveal that a sim was inserted that
	* requires the emergency affordance. The value is a boolean (1 or 0).
	* @hide
	*/
	private static final String EMERGENCY_SIM_INSERTED_SETTING = "emergency_sim_inserted_before";

	private final Context mContext;
	private final ArrayList<Integer> mEmergencyCallMccNumbers;

	private final Object mLock = new Object();

	private TelephonyManager mTelephonyManager;
	private SubscriptionManager mSubscriptionManager;
	private boolean mEmergencyAffordanceNeeded;
	private MyHandler mHandler;
	private int mScansCompleted;
	private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
	@Override
	public void onCellInfoChanged(List<CellInfo> cellInfo) {
	if (!isEmergencyAffordanceNeeded()) {
	requestCellScan();
	}
	}

	@Override
	public void onCellLocationChanged(CellLocation location) {
	if (!isEmergencyAffordanceNeeded()) {
	requestCellScan();
	}
	}
	};
	private BroadcastReceiver mAirplaneModeReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	if (Settings.Global.getInt(context.getContentResolver(),
	Settings.Global.AIRPLANE_MODE_ON, 0) == 0) {
	startScanning();
	requestCellScan();
	}
	}
	};
	private boolean mSimNeedsEmergencyAffordance;
	private boolean mNetworkNeedsEmergencyAffordance;
	private boolean mVoiceCapable;

	private void requestCellScan() {
	mHandler.obtainMessage(CELL_INFO_STATE_CHANGED).sendToTarget();
	}

	private SubscriptionManager.OnSubscriptionsChangedListener mSubscriptionChangedListener
	= new SubscriptionManager.OnSubscriptionsChangedListener() {
	@Override
	public void onSubscriptionsChanged() {
	mHandler.obtainMessage(SUBSCRIPTION_CHANGED).sendToTarget();
	}
	};

	public EmergencyAffordanceService(Context context) {
	super(context);
	mContext = context;
	int[] numbers = context.getResources().getIntArray(
	com.android.internal.R.array.config_emergency_mcc_codes);
	mEmergencyCallMccNumbers = new ArrayList<>(numbers.length);
	for (int i = 0; i < numbers.length; i++) {
	mEmergencyCallMccNumbers.add(numbers[i]);
	}
	}

	private void updateEmergencyAffordanceNeeded() {
	synchronized (mLock) {
	mEmergencyAffordanceNeeded = mVoiceCapable && (mSimNeedsEmergencyAffordance \|\|
	mNetworkNeedsEmergencyAffordance);
	Settings.Global.putInt(mContext.getContentResolver(),
	Settings.Global.EMERGENCY_AFFORDANCE_NEEDED,
	mEmergencyAffordanceNeeded ? 1 : 0);
	if (mEmergencyAffordanceNeeded) {
	stopScanning();
	}
	}
	}

	private void stopScanning() {
	synchronized (mLock) {
	mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
	mScansCompleted = 0;
	}
	}

	private boolean isEmergencyAffordanceNeeded() {
	synchronized (mLock) {
	return mEmergencyAffordanceNeeded;
	}
	}

	@Override
	public void onStart() {
	}

	@Override
	public void onBootPhase(int phase) {
	if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) {
	mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
	mVoiceCapable = mTelephonyManager.isVoiceCapable();
	if (!mVoiceCapable) {
	updateEmergencyAffordanceNeeded();
	return;
	}
	mSubscriptionManager = SubscriptionManager.from(mContext);
	HandlerThread thread = new HandlerThread(TAG);
	thread.start();
	mHandler = new MyHandler(thread.getLooper());
	mHandler.obtainMessage(INITIALIZE_STATE).sendToTarget();
	startScanning();
	IntentFilter filter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
	mContext.registerReceiver(mAirplaneModeReceiver, filter);
	mSubscriptionManager.addOnSubscriptionsChangedListener(mSubscriptionChangedListener);
	}
	}

	private void startScanning() {
	mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CELL_INFO
	\| PhoneStateListener.LISTEN_CELL_LOCATION);
	}

	/** Handler to do the heavier work on */
	private class MyHandler extends Handler {

	public MyHandler(Looper l) {
	super(l);
	}

	@Override
	public void handleMessage(Message msg) {
	switch (msg.what) {
	case INITIALIZE_STATE:
	handleInitializeState();
	break;
	case CELL_INFO_STATE_CHANGED:
	handleUpdateCellInfo();
	break;
	case SUBSCRIPTION_CHANGED:
	handleUpdateSimSubscriptionInfo();
	break;
	}
	}
	}

	private void handleInitializeState() {
	if (handleUpdateSimSubscriptionInfo()) {
	return;
	}
	if (handleUpdateCellInfo()) {
	return;
	}
	updateEmergencyAffordanceNeeded();
	}

	private boolean handleUpdateSimSubscriptionInfo() {
	boolean neededBefore = simNeededAffordanceBefore();
	boolean neededNow = neededBefore;
	List<SubscriptionInfo> activeSubscriptionInfoList =
	mSubscriptionManager.getActiveSubscriptionInfoList();
	if (activeSubscriptionInfoList == null) {
	setSimNeedsEmergencyAffordance(neededNow);
	return neededNow;
	}
	for (SubscriptionInfo info : activeSubscriptionInfoList) {
	int mcc = info.getMcc();
	if (mccRequiresEmergencyAffordance(mcc)) {
	neededNow = true;
	break;
	} else if (mcc != 0 && mcc != Integer.MAX_VALUE){
	// a Sim with a different mcc code was found
	neededNow = false;
	}
	String simOperator = mTelephonyManager.getSimOperator(info.getSubscriptionId());
	mcc = 0;
	if (simOperator != null && simOperator.length() >= 3) {
	mcc = Integer.parseInt(simOperator.substring(0, 3));
	}
	if (mcc != 0) {
	if (mccRequiresEmergencyAffordance(mcc)) {
	neededNow = true;
	break;
	} else {
	// a Sim with a different mcc code was found
	neededNow = false;
	}
	}
	}
	setSimNeedsEmergencyAffordance(neededNow);
	return neededNow;
	}

	private void setSimNeedsEmergencyAffordance(boolean simNeedsEmergencyAffordance) {
	if (simNeededAffordanceBefore() != simNeedsEmergencyAffordance) {
	Settings.Global.putInt(mContext.getContentResolver(),
	EMERGENCY_SIM_INSERTED_SETTING,
	simNeedsEmergencyAffordance ? 1 : 0);
	}
	if (simNeedsEmergencyAffordance != mSimNeedsEmergencyAffordance) {
	mSimNeedsEmergencyAffordance = simNeedsEmergencyAffordance;
	updateEmergencyAffordanceNeeded();
	}
	}

	private boolean simNeededAffordanceBefore() {
	return Settings.Global.getInt(mContext.getContentResolver(),
	EMERGENCY_SIM_INSERTED_SETTING, 0) != 0;
	}

	private boolean handleUpdateCellInfo() {
	List<CellInfo> cellInfos = mTelephonyManager.getAllCellInfo();
	if (cellInfos == null) {
	return false;
	}
	boolean stopScanningAfterScan = false;
	for (CellInfo cellInfo : cellInfos) {
	int mcc = 0;
	if (cellInfo instanceof CellInfoGsm) {
	mcc = ((CellInfoGsm) cellInfo).getCellIdentity().getMcc();
	} else if (cellInfo instanceof CellInfoLte) {
	mcc = ((CellInfoLte) cellInfo).getCellIdentity().getMcc();
	} else if (cellInfo instanceof CellInfoWcdma) {
	mcc = ((CellInfoWcdma) cellInfo).getCellIdentity().getMcc();
	}
	if (mccRequiresEmergencyAffordance(mcc)) {
	setNetworkNeedsEmergencyAffordance(true);
	return true;
	} else if (mcc != 0 && mcc != Integer.MAX_VALUE) {
	// we found an mcc that isn't in the list, abort
	stopScanningAfterScan = true;
	}
	}
	if (stopScanningAfterScan) {
	stopScanning();
	} else {
	onCellScanFinishedUnsuccessful();
	}
	setNetworkNeedsEmergencyAffordance(false);
	return false;
	}

	private void setNetworkNeedsEmergencyAffordance(boolean needsAffordance) {
	synchronized (mLock) {
	mNetworkNeedsEmergencyAffordance = needsAffordance;
	updateEmergencyAffordanceNeeded();
	}
	}

	private void onCellScanFinishedUnsuccessful() {
	synchronized (mLock) {
	mScansCompleted++;
	if (mScansCompleted >= NUM_SCANS_UNTIL_ABORT) {
	stopScanning();
	}
	}
	}

	private boolean mccRequiresEmergencyAffordance(int mcc) {
	return mEmergencyCallMccNumbers.contains(mcc);
	}
	}