IBinder.java revision 0d4b9c993d8f1108294f8ccb84eeacd92f051b50
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.os; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.FileDescriptor; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.PrintWriter; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Base interface for a remotable object, the core part of a lightweight 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * remote procedure call mechanism designed for high performance when 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * performing in-process and cross-process calls. This 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * interface describes the abstract protocol for interacting with a 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * remotable object. Do not implement this interface directly, instead 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * extend from {@link Binder}. 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The key IBinder API is {@link #transact transact()} matched by 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link Binder#onTransact Binder.onTransact()}. These 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * methods allow you to send a call to an IBinder object and receive a 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * call coming in to a Binder object, respectively. This transaction API 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is synchronous, such that a call to {@link #transact transact()} does not 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * return until the target has returned from 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link Binder#onTransact Binder.onTransact()}; this is the 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * expected behavior when calling an object that exists in the local 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * process, and the underlying inter-process communication (IPC) mechanism 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ensures that these same semantics apply when going across processes. 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The data sent through transact() is a {@link Parcel}, a generic buffer 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of data that also maintains some meta-data about its contents. The meta 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * data is used to manage IBinder object references in the buffer, so that those 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * references can be maintained as the buffer moves across processes. This 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mechanism ensures that when an IBinder is written into a Parcel and sent to 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * another process, if that other process sends a reference to that same IBinder 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * back to the original process, then the original process will receive the 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * same IBinder object back. These semantics allow IBinder/Binder objects to 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be used as a unique identity (to serve as a token or for other purposes) 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * that can be managed across processes. 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The system maintains a pool of transaction threads in each process that 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it runs in. These threads are used to dispatch all 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * IPCs coming in from other processes. For example, when an IPC is made from 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * process A to process B, the calling thread in A blocks in transact() as 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it sends the transaction to process B. The next available pool thread in 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * B receives the incoming transaction, calls Binder.onTransact() on the target 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * object, and replies with the result Parcel. Upon receiving its result, the 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * thread in process A returns to allow its execution to continue. In effect, 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * other processes appear to use as additional threads that you did not create 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * executing in your own process. 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The Binder system also supports recursion across processes. For example 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if process A performs a transaction to process B, and process B while 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * handling that transaction calls transact() on an IBinder that is implemented 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * in A, then the thread in A that is currently waiting for the original 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * transaction to finish will take care of calling Binder.onTransact() on the 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * object being called by B. This ensures that the recursion semantics when 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * calling remote binder object are the same as when calling local objects. 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>When working with remote objects, you often want to find out when they 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * are no longer valid. There are three ways this can be determined: 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <ul> 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> The {@link #transact transact()} method will throw a 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link RemoteException} exception if you try to call it on an IBinder 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whose process no longer exists. 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> The {@link #pingBinder()} method can be called, and will return false 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if the remote process no longer exists. 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> The {@link #linkToDeath linkToDeath()} method can be used to register 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a {@link DeathRecipient} with the IBinder, which will be called when its 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing process goes away. 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </ul> 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see Binder 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic interface IBinder { 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The first transaction code available for user commands. 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int FIRST_CALL_TRANSACTION = 0x00000001; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The last transaction code available for user commands. 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int LAST_CALL_TRANSACTION = 0x00ffffff; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * IBinder protocol transaction code: pingBinder(). 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int PING_TRANSACTION = ('_'<<24)|('P'<<16)|('N'<<8)|'G'; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * IBinder protocol transaction code: dump internal state. 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int DUMP_TRANSACTION = ('_'<<24)|('D'<<16)|('M'<<8)|'P'; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * IBinder protocol transaction code: interrogate the recipient side 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the transaction for its canonical interface descriptor. 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int INTERFACE_TRANSACTION = ('_'<<24)|('N'<<16)|('T'<<8)|'F'; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1130d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * IBinder protocol transaction code: send a tweet to the target 1140d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * object. The data in the parcel is intended to be delivered to 1150d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * a shared messaging service associated with the object; it can be 1160d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * anything, as long as it is not more than 130 UTF-8 characters to 1170d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * conservatively fit within common messaging services. As part of 1180d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * {@link Build.VERSION_CODES#HONEYCOMB_MR2}, all Binder objects are 1190d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * expected to support this protocol for fully integrated tweeting 1200d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * across the platform. To support older code, the default implementation 1210d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * logs the tweet to the main log as a simple emulation of broadcasting 1220d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * it publicly over the Internet. 1230d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * 1240d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * <p>Also, upon completing the dispatch, the object must make a cup 1250d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * of tea, return it to the caller, and exclaim "jolly good message 1260d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn * old boy!". 1270d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn */ 1280d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn int TWEET_TRANSACTION = ('_'<<24)|('T'<<16)|('W'<<8)|'T'; 1290d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn 1300d4b9c993d8f1108294f8ccb84eeacd92f051b50Dianne Hackborn /** 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Flag to {@link #transact}: this is a one-way call, meaning that the 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * caller returns immediately, without waiting for a result from the 133d76ef97930d45e37dba4ac58b376c3067c2eb54aDirk Dougherty * callee. Applies only if the caller and callee are in different 134d76ef97930d45e37dba4ac58b376c3067c2eb54aDirk Dougherty * processes. 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int FLAG_ONEWAY = 0x00000001; 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the canonical name of the interface supported by this binder. 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String getInterfaceDescriptor() throws RemoteException; 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Check to see if the object still exists. 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns false if the 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * hosting process is gone, otherwise the result (always by default 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * true) returned by the pingBinder() implementation on the other 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * side. 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pingBinder(); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Check to see if the process that the binder is in is still alive. 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return false if the process is not alive. Note that if it returns 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * true, the process may have died while the call is returning. 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isBinderAlive(); 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Attempt to retrieve a local implementation of an interface 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * for this Binder object. If null is returned, you will need 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to instantiate a proxy class to marshall calls through 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the transact() method. 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public IInterface queryLocalInterface(String descriptor); 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Print the object's state into the given stream. 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fd The raw file descriptor that the dump is being sent to. 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param args additional arguments to the dump request. 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void dump(FileDescriptor fd, String[] args) throws RemoteException; 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1789a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn * Like {@link #dump(FileDescriptor, String[])} but always executes 1799a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn * asynchronously. If the object is local, a new thread is created 1809a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn * to perform the dump. 1819a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn * 1829a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn * @param fd The raw file descriptor that the dump is being sent to. 1839a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn * @param args additional arguments to the dump request. 1849a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn */ 1859a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn public void dumpAsync(FileDescriptor fd, String[] args) throws RemoteException; 1869a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn 1879a84983a9fd9959671e102045eaf185b83291269Dianne Hackborn /** 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Perform a generic operation with the object. 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param code The action to perform. This should 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be a number between {@link #FIRST_CALL_TRANSACTION} and 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link #LAST_CALL_TRANSACTION}. 193334031cd07c3bd09d23fce0ebaf946fc6ecfee26Glenn Kasten * @param data Marshalled data to send to the target. Must not be null. 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If you are not sending any data, you must create an empty Parcel 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * that is given here. 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param reply Marshalled data to be received from the target. May be 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * null if you are not interested in the return value. 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param flags Additional operation flags. Either 0 for a normal 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * RPC, or {@link #FLAG_ONEWAY} for a one-way RPC. 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean transact(int code, Parcel data, Parcel reply, int flags) 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throws RemoteException; 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Interface for receiving a callback when the process hosting an IBinder 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * has gone away. 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see #linkToDeath 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public interface DeathRecipient { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void binderDied(); 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Register the recipient for a notification if this binder 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * goes away. If this binder object unexpectedly goes away 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (typically because its hosting process has been killed), 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * then the given {@link DeathRecipient}'s 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link DeathRecipient#binderDied DeathRecipient.binderDied()} method 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be called. 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>You will only receive death notifications for remote binders, 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * as local binders by definition can't die without you dying as well. 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws Throws {@link RemoteException} if the target IBinder's 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * process has already died. 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see #unlinkToDeath 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void linkToDeath(DeathRecipient recipient, int flags) 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throws RemoteException; 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Remove a previously registered death notification. 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The recipient will no longer be called if this object 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * dies. 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true if the <var>recipient</var> is successfully 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * unlinked, assuring you that its 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link DeathRecipient#binderDied DeathRecipient.binderDied()} method 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will not be called. Returns false if the target IBinder has already 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * died, meaning the method has been (or soon will be) called. 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws Throws {@link java.util.NoSuchElementException} if the given 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <var>recipient</var> has not been registered with the IBinder, and 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the IBinder is still alive. Note that if the <var>recipient</var> 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * was never registered, but the IBinder has already died, then this 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * exception will <em>not</em> be thrown, and you will receive a false 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * return value instead. 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean unlinkToDeath(DeathRecipient recipient, int flags); 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 253