Android Sound focus----from music back to luncher adjust the volume to show the volume of music

Types of sounds are: defined in the Audiosystem.java file

/* The default audio stream */public static final int stream_default = -1;/* the audio stream for phone calls */public STA Tic Final int stream_voice_call = 0;/* The audio STREAM for system sounds */public static final int stream_system = 1;/* T He audio stream for the phone ring and message alerts */public static final int stream_ring = 2;/* The audio stream for Mu SIC playback */public static final int stream_music = 3;/* The audio STREAM for alarms */public static final int Stream_al ARM = 4;/* The audio stream for notifications */public static final int stream_notification = 5;/* @hide the audio stream For phone calls when connected on Bluetooth */public static final int stream_bluetooth_sco = 6;/* @hide the audio STREAM F or enforced system sounds in certain countries (e.g camera in Japan) */public static final int stream_system_enforced = 7; /* @hide the audio stream for DTMF tones */public static final int STREAM_DTMF = 8;/* @hide The audio stream for text to s Peech (TTS) */public STATic Final int stream_tts = 9; 

Normally in the audio and video interface to adjust the volume of the stream is Stream_music, back to luncher adjust is stream_voice_call, but this switch a little delay streamoverride.sdelayms, resulting in the exit tone, After the video interface is adjusted immediately, the change is still the size of the Stream_music:

You can modify the/frameworks/base/media/java/android/media/audioservice.java file

 /** * For code clarity for Getactivestreamtype (int.) * @param Delay_ms max time since last Stream_music activity T o Consider * @return true if Stream_music is active in streams handled by Audioflinger now or * in the last "D     Elay_ms "Ms. */Private Boolean isafmusicactiverecently (int delay_ms) {return audiosystem.isstreamactive (AUDIOSYSTEM.STREAM_ MUSIC, Delay_ms) | |    Audiosystem.isstreamactiveremotely (Audiosystem.stream_music, Delay_ms); } private int Getactivestreamtype (int suggestedstreamtype) {switch (mplatformtype) {case Platform_voice                        : if (isincommunication ()) {if (Audiosystem.getforceuse (audiosystem.for_communication)) = = Audiosystem.force_bt_sco) {//LOG.V (TAG, "getactivestreamtype:forcing Stream_blueto                    Oth_sco ... ");                return Audiosystem.stream_bluetooth_sco; } else {//LOG.V (TAG, "getactiveStreamtype:forcing stream_voice_call ... ");                return audiosystem.stream_voice_call; }} else if (Suggestedstreamtype = = Audiomanager.use_default_stream_type) {if (isafmusicactiver ecently (streamoverride.sdelayms)) {if (Debug_vol) log.v (TAG, "getactivestreamty                    Pe:forcing stream_music STREAM Active ");                    return audiosystem.stream_music; } else {if (Debug_vol) log.v (TAG, "getactivestreamtype:forcing STREAM_                        RING b/c default ");                return audiosystem.stream_ring; }} else if (isafmusicactiverecently (0)) {if (Debug_vol) log.v (TAG, "getacti                Vestreamtype:forcing stream_music STREAM Active ");            return audiosystem.stream_music;        } break; Case Platform_television:if (SuggestedstreaMtype = = Audiomanager.use_default_stream_type) {//TV always defaults to Stream_music            return audiosystem.stream_music;        } break;                        Default:if (Isincommunication ()) {if (Audiosystem.getforceuse (audiosystem.for_communication) = = Audiosystem.force_bt_sco) {if (Debug_vol) log.v (TAG, "Getactivestreamtype:fo                    Rcing Stream_bluetooth_sco ");                return Audiosystem.stream_bluetooth_sco;                    } else {if (Debug_vol) log.v (TAG, "getactivestreamtype:forcing stream_voice_call");                return audiosystem.stream_voice_call; }} else if (Audiosystem.isstreamactive (Audiosystem.stream_notification, Streamoverride.sdel                    ayms) | |                Audiosystem.isstreamactive (audiosystem.stream_ring, streamoverride.sdelayms)) { if (DEbug_vol) log.v (TAG, "getactivestreamtype:forcing stream_notification");            return audiosystem.stream_notification; } else if (Suggestedstreamtype = = Audiomanager.use_default_stream_type) {if (isafmusicactiverecently (Strea                    moverride.sdelayms) {if (Debug_vol) log.v (TAG, "getactivestreamtype:forcing stream_music");                return audiosystem.stream_music; } else {if (Debug_vol) log.v (TAG, "getactivestreamtype:using Stream_notifi                    cation as default ");                return audiosystem.stream_notification;        }} break;         } if (Debug_vol) log.v (TAG, "getactivestreamtype:returning suggested type" + Suggestedstreamtype);    return suggestedstreamtype; }

Change isafmusicactiverecently (streamoverride.sdelayms) to: isafmusicactiverecently (0) or a small value.

Android Sound focus----from music back to luncher adjust the volume to show the volume of music