说明

  系统默认的音量太大，需要将默认音量调小一点。

实现

  主要是修改系统、铃声、媒体、闹钟的默认音量大小。

zhoujy@TP:~/data/android/sc826_cn_01_00/msm_8953_git/frameworks$ git show 58a8d5266736e328aa7abbddb8944c4c541ee2ac
commit 58a8d5266736e328aa7abbddb8944c4c541ee2ac
Author: zhoujinyan 
Date:   Sun Jun 28 19:45:16 2020 +0800[frameworks]修改系统默认音量diff --git a/frameworks/base/media/java/android/media/AudioSystem.java b/frameworks/base/media/java/android/media/AudioSystem.java
index e08c290..a930b80 100644
--- a/frameworks/base/media/java/android/media/AudioSystem.java
+++ b/frameworks/base/media/java/android/media/AudioSystem.java
@@ -770,10 +770,10 @@ public class AudioSystempublic static int[] DEFAULT_STREAM_VOLUME = new int[] {4,  // STREAM_VOICE_CALL
-        7,  // STREAM_SYSTEM
-        5,  // STREAM_RING
-        11, // STREAM_MUSIC
-        6,  // STREAM_ALARM
+        4,  // STREAM_SYSTEM
+        3,  // STREAM_RING
+        5, // STREAM_MUSIC
+        3,  // STREAM_ALARM5,  // STREAM_NOTIFICATION7,  // STREAM_BLUETOOTH_SCO7,  // STREAM_SYSTEM_ENFORCED

修改电话声音最大值，进度条就可以调节多个

diff --git a/frameworks/base/services/core/java/com/android/server/audio/AudioService.java b/frameworks/base/services/core/java/com/android/server/audio/AudioService.java
index cf7a9ea..1fdc05f 100644
--- a/frameworks/base/services/core/java/com/android/server/audio/AudioService.java
+++ b/frameworks/base/services/core/java/com/android/server/audio/AudioService.java
@@ -282,7 +282,7 @@ public class AudioService extends IAudioService.Stub {/** Maximum volume index values for audio streams */private static int[] MAX_STREAM_VOLUME = new int[] {
-        5,  // STREAM_VOICE_CALL
+        8,  // STREAM_VOICE_CALL7,  // STREAM_SYSTEM7,  // STREAM_RING15, // STREAM_MUSIC

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