Android 收音机音量开到最大都没有“将音量调高到安全级别以上？会损坏听力”提示 M

正文

[DESCRIPTION]
插入耳机端口,打开音乐。侧键音量开到最大，出现提示框“将音量调高到安全级别以上？会损坏听力”这样的提示。而同样的路径打开收音机，点击侧音量键把音量调到最大，没有相应的提示。
[SOLUTION]
修改
1， private static final int MSG_CHECK_FM_ACTIVE = 29;
2，
private void onCheckFmActive() {
synchronized (mSafeMediaVolumeState) {
if (mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_INACTIVE) {
int device = getDeviceForStream(AudioSystem.STREAM_FM);
if ((device & mSafeMediaVolumeDevices) != 0) {
sendMsg(mAudioHandler, MSG_CHECK_FM_ACTIVE, SENDMSG_REPLACE, 0, 0, null,
FM_ACTIVE_POLL_PERIOD_MS);
int index = mStreamStates[AudioSystem.STREAM_FM]
.getIndex(device, false /* lastAudible */);
if (AudioSystem.isStreamActive(AudioSystem.STREAM_FM, 0)
&& (index > mSafeMediaVolumeIndex)) {
// Approximate cumulative active music time
mFmeMs += FM_ACTIVE_POLL_PERIOD_MS;
if (mFmeMs > UNSAFE_VOLUME_FM_ACTIVE_MS_MAX) {
setSafeMediaVolumeEnabled(true);
mFmeMs = 0;
mVolumePanel.postDisplaySafeVolumeWarning();
}
}
}
}
}
}
3，
在 case MSG_CHECK_MUSIC_ACTIVE:
onCheckMusicActive();
break;
后面增加
/// M: safe media for FM @{
case MSG_CHECK_FM_ACTIVE:
onCheckFmActive();
break;
/// safe media for FM @}
4， 在 private void onSetWiredDeviceConnectionState(int device, int state, String name)
sendMsg(mAudioHandler,
MSG_CHECK_MUSIC_ACTIVE,
SENDMSG_REPLACE,
0,
0,
null,
MUSIC_ACTIVE_POLL_PERIOD_MS);
后面增加
/// safe media for FM @{
sendMsg(mAudioHandler, MSG_CHECK_FM_ACTIVE, SENDMSG_REPLACE, 0, 0, null,
FM_ACTIVE_POLL_PERIOD_MS);
/// safe media for FM @}
5，
在 private static final int SAFE_VOLUME_CONFIGURE_TIMEOUT_MS = 30000; // 30s after boot completed
后面增加如下
private int mFmeMs;
private static final int UNSAFE_VOLUME_FM_ACTIVE_MS_MAX = (20 * 3600 * 1000); // 20
// hours
private static final int FM_ACTIVE_POLL_PERIOD_MS = 60000; // 1 minute
6，以下几个函数改为如下
private void setSafeMediaVolumeEnabled(boolean on) {
synchronized (mSafeMediaVolumeState) {
if ((mSafeMediaVolumeState != SAFE_MEDIA_VOLUME_NOT_CONFIGURED)
&& (mSafeMediaVolumeState != SAFE_MEDIA_VOLUME_DISABLED)) {
if (on && (mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_INACTIVE)) {
mSafeMediaVolumeState = SAFE_MEDIA_VOLUME_ACTIVE;
enforceSafeMediaVolume();
} else if (!on && (mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_ACTIVE)) {
mSafeMediaVolumeState = SAFE_MEDIA_VOLUME_INACTIVE;
mMusicActiveMs = 0;
sendMsg(mAudioHandler, MSG_CHECK_MUSIC_ACTIVE, SENDMSG_REPLACE, 0, 0, null,
MUSIC_ACTIVE_POLL_PERIOD_MS);
mFmeMs = 0;
sendMsg(mAudioHandler, MSG_CHECK_FM_ACTIVE, SENDMSG_REPLACE, 0, 0, null,
FM_ACTIVE_POLL_PERIOD_MS);
}
}
}
}
private void enforceSafeMediaVolume() {
enforceSafeMediaVolume(AudioSystem.STREAM_MUSIC);
enforceSafeMediaVolume(AudioSystem.STREAM_FM);
}
private void enforceSafeMediaVolume(int streamType) {
VolumeStreamState streamState = mStreamStates[streamType];
boolean lastAudible = (streamState.muteCount() != 0);
int devices = mSafeMediaVolumeDevices;
int i = 0;
while (devices != 0) {
int device = 1 << i++;
if ((device & devices) == 0) {
continue;
}
int index = streamState.getIndex(device, lastAudible);
if (index > mSafeMediaVolumeIndex) {
if (lastAudible) {
streamState.setLastAudibleIndex(mSafeMediaVolumeIndex, device);
sendMsg(mAudioHandler, MSG_PERSIST_VOLUME, SENDMSG_QUEUE, PERSIST_LAST_AUDIBLE,
device, streamState, PERSIST_DELAY);
} else {
streamState.setIndex(mSafeMediaVolumeIndex, device, true);
sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE, device, 0,
streamState, 0);
}
}
devices &= ~device;
}
}
private boolean checkSafeMediaVolume(int streamType, int index, int device) {
synchronized (mSafeMediaVolumeState) {
if ((mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_ACTIVE)
&& (mStreamVolumeAlias[streamType] == AudioSystem.STREAM_MUSIC || mStreamVolumeAlias[streamType] == AudioSystem.STREAM_FM)
&& ((device & mSafeMediaVolumeDevices) != 0) && (index > mSafeMediaVolumeIndex)) {
mVolumePanel.postDisplaySafeVolumeWarning();
return false;
}
return true;
}
}
/// safe media for FM @}
(alps/frameworks/base/media/java/android/media/AudioService.java)
然后
mk xxx(project_name) mm frameworks/base
adb remount
adb push framework.jar system/framework
adb reboot
即可验证功能。