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.settingslib.development; 18 19 import android.os.AsyncTask; 20 import android.os.IBinder; 21 import android.os.Parcel; 22 import android.os.RemoteException; 23 import android.os.ServiceManager; 24 import android.util.Log; 25 26 import androidx.annotation.NonNull; 27 import androidx.annotation.VisibleForTesting; 28 29 public class SystemPropPoker { 30 private static final String TAG = "SystemPropPoker"; 31 32 private static final SystemPropPoker sInstance = new SystemPropPoker(); 33 34 private boolean mBlockPokes = false; 35 SystemPropPoker()36 private SystemPropPoker() {} 37 38 @NonNull getInstance()39 public static SystemPropPoker getInstance() { 40 return sInstance; 41 } 42 blockPokes()43 public void blockPokes() { 44 mBlockPokes = true; 45 } 46 unblockPokes()47 public void unblockPokes() { 48 mBlockPokes = false; 49 } 50 poke()51 public void poke() { 52 if (!mBlockPokes) { 53 createPokerTask().execute(); 54 } 55 } 56 57 @VisibleForTesting createPokerTask()58 PokerTask createPokerTask() { 59 return new PokerTask(); 60 } 61 62 public static class PokerTask extends AsyncTask<Void, Void, Void> { 63 64 @VisibleForTesting listServices()65 String[] listServices() { 66 return ServiceManager.listServices(); 67 } 68 69 @VisibleForTesting checkService(String service)70 IBinder checkService(String service) { 71 return ServiceManager.checkService(service); 72 } 73 74 @Override doInBackground(Void... params)75 protected Void doInBackground(Void... params) { 76 String[] services = listServices(); 77 if (services == null) { 78 Log.e(TAG, "There are no services, how odd"); 79 return null; 80 } 81 for (String service : services) { 82 IBinder obj = checkService(service); 83 if (obj != null) { 84 Parcel data = Parcel.obtain(); 85 try { 86 obj.transact(IBinder.SYSPROPS_TRANSACTION, data, null, 0); 87 } catch (RemoteException e) { 88 // Ignore 89 } catch (Exception e) { 90 Log.i(TAG, "Someone wrote a bad service '" + service 91 + "' that doesn't like to be poked", e); 92 } 93 data.recycle(); 94 } 95 } 96 return null; 97 } 98 } 99 } 100