Erik Kline | 227648f | 2017-01-20 20:26:10 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.connectivity.tethering; |
| 18 | |
| 19 | import static com.android.internal.telephony.IccCardConstants.INTENT_VALUE_ICC_LOADED; |
| 20 | import static com.android.internal.telephony.IccCardConstants.INTENT_KEY_ICC_STATE; |
| 21 | |
| 22 | import android.content.BroadcastReceiver; |
| 23 | import android.content.Context; |
| 24 | import android.content.Intent; |
| 25 | import android.content.IntentFilter; |
| 26 | import android.os.Handler; |
| 27 | import android.util.Log; |
| 28 | |
| 29 | import com.android.internal.telephony.TelephonyIntents; |
| 30 | |
| 31 | import java.util.concurrent.atomic.AtomicInteger; |
| 32 | |
| 33 | |
| 34 | /** |
| 35 | * A utility class that runs the provided callback on the provided handler when |
| 36 | * observing a new SIM card having been loaded. |
| 37 | * |
| 38 | * @hide |
| 39 | */ |
| 40 | public class SimChangeListener { |
| 41 | private static final String TAG = SimChangeListener.class.getSimpleName(); |
| 42 | private static final boolean DBG = false; |
| 43 | |
| 44 | private final Context mContext; |
| 45 | private final Handler mTarget; |
| 46 | private final AtomicInteger mSimBcastGenerationNumber; |
| 47 | private final Runnable mCallback; |
| 48 | private BroadcastReceiver mBroadcastReceiver; |
| 49 | |
| 50 | public SimChangeListener(Context ctx, Handler handler, Runnable onSimCardLoadedCallback) { |
| 51 | mContext = ctx; |
| 52 | mTarget = handler; |
| 53 | mCallback = onSimCardLoadedCallback; |
| 54 | mSimBcastGenerationNumber = new AtomicInteger(0); |
| 55 | } |
| 56 | |
| 57 | public int generationNumber() { |
| 58 | return mSimBcastGenerationNumber.get(); |
| 59 | } |
| 60 | |
| 61 | public void startListening() { |
| 62 | if (DBG) Log.d(TAG, "startListening for SIM changes"); |
| 63 | |
| 64 | if (mBroadcastReceiver != null) return; |
| 65 | |
| 66 | mBroadcastReceiver = new SimChangeBroadcastReceiver( |
| 67 | mSimBcastGenerationNumber.incrementAndGet()); |
| 68 | final IntentFilter filter = new IntentFilter(); |
| 69 | filter.addAction(TelephonyIntents.ACTION_SIM_STATE_CHANGED); |
| 70 | |
| 71 | mContext.registerReceiver(mBroadcastReceiver, filter, null, mTarget); |
| 72 | } |
| 73 | |
| 74 | public void stopListening() { |
| 75 | if (DBG) Log.d(TAG, "stopListening for SIM changes"); |
| 76 | |
| 77 | if (mBroadcastReceiver == null) return; |
| 78 | |
| 79 | mSimBcastGenerationNumber.incrementAndGet(); |
| 80 | mContext.unregisterReceiver(mBroadcastReceiver); |
| 81 | mBroadcastReceiver = null; |
| 82 | } |
| 83 | |
| 84 | private boolean isSimCardLoaded(String state) { |
| 85 | return INTENT_VALUE_ICC_LOADED.equals(state); |
| 86 | } |
| 87 | |
| 88 | private class SimChangeBroadcastReceiver extends BroadcastReceiver { |
| 89 | // used to verify this receiver is still current |
| 90 | final private int mGenerationNumber; |
| 91 | |
| 92 | // used to check the sim state transition from non-loaded to loaded |
| 93 | private boolean mSimNotLoadedSeen = false; |
| 94 | |
| 95 | public SimChangeBroadcastReceiver(int generationNumber) { |
| 96 | mGenerationNumber = generationNumber; |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public void onReceive(Context context, Intent intent) { |
| 101 | final int currentGenerationNumber = mSimBcastGenerationNumber.get(); |
| 102 | |
| 103 | if (DBG) { |
| 104 | Log.d(TAG, "simchange mGenerationNumber=" + mGenerationNumber + |
| 105 | ", current generationNumber=" + currentGenerationNumber); |
| 106 | } |
| 107 | if (mGenerationNumber != currentGenerationNumber) return; |
| 108 | |
| 109 | final String state = intent.getStringExtra(INTENT_KEY_ICC_STATE); |
| 110 | Log.d(TAG, "got Sim changed to state " + state + ", mSimNotLoadedSeen=" + |
| 111 | mSimNotLoadedSeen); |
| 112 | |
| 113 | if (!isSimCardLoaded(state)) { |
| 114 | mSimNotLoadedSeen = true; |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | if (mSimNotLoadedSeen) { |
| 119 | mSimNotLoadedSeen = false; |
| 120 | mCallback.run(); |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | } |