問題：Gtalk

http://androidxref.com/2.3.6/xref/frameworks/base/media/java/android/media/AudioService.java#706

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705 /** @see AudioManager#setMode(int) */ 706 public void setMode(int mode, IBinder cb) { 707 if (!checkAudioSettingsPermission("setMode()")) { 708 return; 709 } 710 711 if (mode < AudioSystem.MODE_CURRENT || mode >= AudioSystem.NUM_MODES) { 712 return; 713 } 714 715 synchronized (mSettingsLock) { 716 if (mode == AudioSystem.MODE_CURRENT) { 717 mode = mMode; 718 } 719 if (mode != mMode) { 720 if (AudioSystem.setPhoneState(mode) == AudioSystem.AUDIO_STATUS_OK) { 721 mMode = mode; 722 723 synchronized(mSetModeDeathHandlers) { 724 SetModeDeathHandler hdlr = null; 725 Iterator iter = mSetModeDeathHandlers.iterator(); 726 while (iter.hasNext()) { 727 SetModeDeathHandler h = (SetModeDeathHandler)iter.next(); 728 if (h.getBinder() == cb) { 729 hdlr = h; 730 // Remove from client list so that it is re-inserted at top of list 731 iter.remove(); 732 break; 733 } 734 } 735 if (hdlr == null) { 736 hdlr = new SetModeDeathHandler(cb); 737 // cb is null when setMode() is called by AudioService constructor 738 if (cb != null) { 739 // Register for client death notification 740 try { 741 cb.linkToDeath(hdlr, 0); 742 } catch (RemoteException e) { 743 // Client has died! 744 Log.w(TAG, "setMode() could not link to "+cb+" binder death"); 745 } 746 } 747 } 748 // Last client to call setMode() is always at top of client list 749 // as required by SetModeDeathHandler.binderDied() 750 mSetModeDeathHandlers.add(0, hdlr); 751 hdlr.setMode(mode); 752 } 753 754 if (mode != AudioSystem.MODE_NORMAL) { 755 clearAllScoClients(); 756 } 757 } 758 } 759 int streamType = getActiveStreamType(AudioManager.USE_DEFAULT_STREAM_TYPE); 760 int index = mStreamStates[STREAM_VOLUME_ALIAS[streamType]].mIndex; 761 setStreamVolumeInt(STREAM_VOLUME_ALIAS[streamType], index, true, false); 762 } 763 } 764

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http://androidxref.com/4.0.4/xref/frameworks/base/media/java/android/media/AudioService.java#854

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853 /** @see AudioManager#setMode(int) */ 854 public void setMode(int mode, IBinder cb) { 855 if (!checkAudioSettingsPermission("setMode()")) { 856 return; 857 } 858 859 if (mode < AudioSystem.MODE_CURRENT || mode >= AudioSystem.NUM_MODES) { 860 return; 861 } 862 863 int newModeOwnerPid = 0; 864 synchronized(mSetModeDeathHandlers) { 865 if (mode == AudioSystem.MODE_CURRENT) { 866 mode = mMode; 867 } 868 newModeOwnerPid = setModeInt(mode, cb, Binder.getCallingPid()); 869 } 870 // when entering RINGTONE, IN_CALL or IN_COMMUNICATION mode, clear all 871 // SCO connections not started by the application changing the mode 872 if (newModeOwnerPid != 0) { 873 disconnectBluetoothSco(newModeOwnerPid); 874 } 875 } 876 877 // must be called synchronized on mSetModeDeathHandlers 878 // setModeInt() returns a valid PID if the audio mode was successfully set to 879 // any mode other than NORMAL. 880 int setModeInt(int mode, IBinder cb, int pid) { 881 int newModeOwnerPid = 0; 882 if (cb == null) { 883 Log.e(TAG, "setModeInt() called with null binder"); 884 return newModeOwnerPid; 885 } 886 887 SetModeDeathHandler hdlr = null; 888 Iterator iter = mSetModeDeathHandlers.iterator(); 889 while (iter.hasNext()) { 890 SetModeDeathHandler h = (SetModeDeathHandler)iter.next(); 891 if (h.getPid() == pid) { 892 hdlr = h; 893 // Remove from client list so that it is re-inserted at top of list 894 iter.remove(); 895 hdlr.getBinder().unlinkToDeath(hdlr, 0); 896 break; 897 } 898 } 899 int status = AudioSystem.AUDIO_STATUS_OK; 900 do { 901 if (mode == AudioSystem.MODE_NORMAL) { 902 // get new mode from client at top the list if any 903 if (!mSetModeDeathHandlers.isEmpty()) { 904 hdlr = mSetModeDeathHandlers.get(0); 905 cb = hdlr.getBinder(); 906 mode = hdlr.getMode(); 907 } 908 } else { 909 if (hdlr == null) { 910 hdlr = new SetModeDeathHandler(cb, pid); 911 } 912 // Register for client death notification 913 try { 914 cb.linkToDeath(hdlr, 0); 915 } catch (RemoteException e) { 916 // Client has died! 917 Log.w(TAG, "setMode() could not link to "+cb+" binder death"); 918 } 919 920 // Last client to call setMode() is always at top of client list 921 // as required by SetModeDeathHandler.binderDied() 922 mSetModeDeathHandlers.add(0, hdlr); 923 hdlr.setMode(mode); 924 } 925 926 if (mode != mMode) { 927 status = AudioSystem.setPhoneState(mode); 928 if (status == AudioSystem.AUDIO_STATUS_OK) { 929 // automatically handle audio focus for mode changes 930 handleFocusForCalls(mMode, mode, cb); 931 mMode = mode; 932 } else { 933 if (hdlr != null) { 934 mSetModeDeathHandlers.remove(hdlr); 935 cb.unlinkToDeath(hdlr, 0); 936 } 937 // force reading new top of mSetModeDeathHandlers stack 938 mode = AudioSystem.MODE_NORMAL; 939 } 940 } else { 941 status = AudioSystem.AUDIO_STATUS_OK; 942 } 943 } while (status != AudioSystem.AUDIO_STATUS_OK && !mSetModeDeathHandlers.isEmpty()); 944 945 if (status == AudioSystem.AUDIO_STATUS_OK) { 946 if (mode != AudioSystem.MODE_NORMAL) { 947 if (mSetModeDeathHandlers.isEmpty()) { 948 Log.e(TAG, "setMode() different from MODE_NORMAL with empty mode client stack"); 949 } else { 950 newModeOwnerPid = mSetModeDeathHandlers.get(0).getPid(); 951 } 952 } 953 int streamType = getActiveStreamType(AudioManager.USE_DEFAULT_STREAM_TYPE); 954 int index = mStreamStates[STREAM_VOLUME_ALIAS[streamType]].mIndex; 955 setStreamVolumeInt(STREAM_VOLUME_ALIAS[streamType], index, true, false); 956 } 957 return newModeOwnerPid; 958 } 959

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