Android 默认按键音开关

android 默认按键音开关的值存储位置在
frameworks/base/packages/SettingsProvider/res/values/defaults.xml ，

<!-- Default for UI touch sounds enabled -->
<bool name="def_sound_effects_enabled">true</bool>

true 为打开； false 为关闭。

查看 AN 8.0 源码，是在 frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java 中读取这个值，

 private void loadUISoundEffectsSettings(SQLiteStatement stmt) {loadBooleanSetting(stmt, Settings.System.DTMF_TONE_WHEN_DIALING,R.bool.def_dtmf_tones_enabled);loadBooleanSetting(stmt, Settings.System.SOUND_EFFECTS_ENABLED,R.bool.def_sound_effects_enabled);loadBooleanSetting(stmt, Settings.System.HAPTIC_FEEDBACK_ENABLED,R.bool.def_haptic_feedback);loadIntegerSetting(stmt, Settings.System.LOCKSCREEN_SOUNDS_ENABLED,R.integer.def_lockscreen_sounds_enabled);}

在 frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/SettingsHelper.java 中根据该值来判断是否加载按键音，

public void restoreValue(Context context, ContentResolver cr, ContentValues contentValues,Uri destination, String name, String value) {// Will we need a post-restore broadcast for this element?String oldValue = null;boolean sendBroadcast = false;final SettingsLookup table;if (destination.equals(Settings.Secure.CONTENT_URI)) {table = sSecureLookup;} else if (destination.equals(Settings.System.CONTENT_URI)) {table = sSystemLookup;} else { /* must be GLOBAL; this was preflighted by the caller */table = sGlobalLookup;}if (sBroadcastOnRestore.contains(name)) {// TODO: http://b/22388012oldValue = table.lookup(cr, name, UserHandle.USER_SYSTEM);sendBroadcast = true;}try {if (Settings.System.SCREEN_BRIGHTNESS.equals(name)) {setBrightness(Integer.parseInt(value));// fall through to the ordinary write to settings} else if (Settings.System.SOUND_EFFECTS_ENABLED.equals(name)) {setSoundEffects(Integer.parseInt(value) == 1);// fall through to the ordinary write to settings} else if (Settings.Secure.LOCATION_PROVIDERS_ALLOWED.equals(name)) {setGpsLocation(value);return;} else if (Settings.Secure.BACKUP_AUTO_RESTORE.equals(name)) {setAutoRestore(Integer.parseInt(value) == 1);} else if (isAlreadyConfiguredCriticalAccessibilitySetting(name)) {return;} else if (Settings.System.RINGTONE.equals(name)|| Settings.System.NOTIFICATION_SOUND.equals(name)) {setRingtone(name, value);return;}// Default case: write the restored value to settingscontentValues.clear();contentValues.put(Settings.NameValueTable.NAME, name);contentValues.put(Settings.NameValueTable.VALUE, value);cr.insert(destination, contentValues);} catch (Exception e) {// If we fail to apply the setting, by definition nothing happenedsendBroadcast = false;} finally {// If this was an element of interest, send the "we just restored it"// broadcast with the historical value now that the new value has// been committed and observers kicked off.if (sendBroadcast) {Intent intent = new Intent(Intent.ACTION_SETTING_RESTORED).setPackage("android").addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY).putExtra(Intent.EXTRA_SETTING_NAME, name).putExtra(Intent.EXTRA_SETTING_NEW_VALUE, value).putExtra(Intent.EXTRA_SETTING_PREVIOUS_VALUE, oldValue);context.sendBroadcastAsUser(intent, UserHandle.SYSTEM, null);}}
}

最后调用 AudioManager 接口实现按键音效果，

private AudioManager mAudioManager;
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);private void setSoundEffects(boolean enable) {if (enable) {mAudioManager.loadSoundEffects();} else {mAudioManager.unloadSoundEffects();}
}

Android 默认按键音开关相关推荐

Android 修改按键音
一.按键音调用流程摘要:按键音播放的总体逻辑是先找到系统中按键音的资源,然后调用SoundPool.load让系统加载音频资源,加载成功后在onLoadComplete回调中会返回一个非0的soun ...
android 系统按键音framework流程源码解析
android 系统按键音framework源码解析(基于android 9.0) 今天来看下android中按键音的处理,首先看下按键是在那里开启的.然后再看看当按下按键后一个按键音是怎么播放出来的 ...
Android P 按键音分析
按键音分析触摸按键音流程第一部分第二部分 AudioService.java 物理按键音流程触摸按键音流程前面简要的流程我们就不分析了,画了一下简要的流程图,由于我分析的源码具有特殊性,分为 ...
android 默认开关,android默认设置的开关
true 自动适应时间true 重力 ...
Android按键音的默认值修改流程
Android 默认按键音开关_南国樗里疾的博客-CSDN博客_android 按键音接口 android setting之Settings.system设置_知不足而奋进的博客-CSDN博客_and ...
Android按键音无效
今天遇到Android系统按键音的问题.在Android TV中,可以通过设置-声音-按键音来设置按键音开或者关.当打开按键音时,在Android TV的各个场景中通过遥控器操作上下左右键的时候都会有 ...
Android9 framework 按键音调用流程及自定义按键音（替换原生按键音）和调节按键音音量的方法
一.按键音调用流程摘要:按键音播放的总体逻辑是先找到系统中按键音的资源,然后调用SoundPool.load让系统加载音频资源,加载成功后在onLoadComplete回调中会返回一个非0的soun ...
苹果11键盘按键音设置方法(苹果11如何设置按键音)
如果你不喜欢在使用苹果11时有按键音,请通过以下方法进行设置: 进入苹果iPhone11的"设置"-"声音与触感"选项.在"声音"栏中点击& ...
Android 8.1 系统按键音
最近接到的任务:实现手机键盘按键音功能可是网上查到的资料太少,可能是现在没什么带键盘的Android设备了一开始我以为系统会做好这些东西,是需要找到一个开关,写一个默认值就行,然鹅事情并没有这么简 ...

Android 默认按键音开关

Android 默认按键音开关相关推荐

最新文章

热门文章