Android 触摸提示音

弱龄寄事外，委怀在琴书。这篇文章主要讲述Android 触摸提示音相关的知识，希望能为你提供帮助。
本文转载自：http://blog.csdn.net/Jin_HeZai/article/details/46791567
近期任务，涉及android触摸提示音。
首先，定位源码目标。很显然的，在原生的设置的声音功能页里面就包含了触摸音的开关。
那么我们找到对应的java代码，SoundSettings.java

package com.android.settings; import java.util.List; public class SoundSettings extends SettingsPreferenceFragment implements Preference.OnPreferenceChangeListener {

可以看到这是个PreferenceFragment的子类。（这里的SettingsPreferenceFragment是继承PreferenceFragment）。那么找到它对应的xml文件。

@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ContentResolver resolver = getContentResolver(); int activePhoneType = TelephonyManager.getDefault().getCurrentPhoneType(); mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); addPreferencesFromResource(R.xml.sound_settings);

常识性的，它在onCreate里面，找到addPreferencesFromResource,然后查看sound_settings的xml文件。
这里我通过查找中文string资源文件，标示了xml文件的一些item的title。

< PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" android:title="@string/sound_settings" android:key="sound_settings" xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"> < !-- 音量--> < com.android.settings.RingerVolumePreference android:key="ring_volume" android:title="@string/all_volume_title" android:dialogTitle="@string/all_volume_title" android:persistent="false" android:streamType="ring" /> < !-- 音乐效果--> < Preference android:key="musicfx" android:title="@string/musicfx_title"> < intent android:targetPackage="com.android.musicfx" android:targetClass="com.android.musicfx.ControlPanelPicker" /> < /Preference> < !-- 来电铃声和振动--> < PreferenceCategory android:key="category_calls_and_notification" android:title="@string/sound_category_call_ringtone_vibrate_title"/> < !-- Do not nest these, or removals in code will break 手机铃声 --> < com.android.settings.DefaultRingtonePreference android:key="ringtone" android:title="@string/ringtone_title" android:dialogTitle="@string/ringtone_title" android:persistent="false" android:ringtoneType="ringtone" /> < !-- 响铃时振动--> < CheckBoxPreference android:key="vibrate_when_ringing" android:title="@string/vibrate_when_ringing_title" android:persistent="false" /> < !-- 系统--> < PreferenceCategory android:title="@string/sound_category_system_title"/> < !-- Do not nest these, or removals in code will break --> < !-- 默认通知提示音--> < com.android.settings.DefaultRingtonePreference android:key="notification_sound" android:title="@string/notification_sound_title" android:dialogTitle="@string/notification_sound_dialog_title" android:persistent="false" android:ringtoneType="notification" /> < !-- 拨号键盘触摸音效--> < CheckBoxPreference android:key="dtmf_tone" android:title="@string/dtmf_tone_enable_title" android:defaultValue="https://www.songbingjia.com/android/true" /> < !-- 触摸提示音--> < CheckBoxPreference android:key="sound_effects" android:title="@string/sound_effects_enable_title" android:defaultValue="https://www.songbingjia.com/android/true" /> < !-- 锁屏提示音--> < CheckBoxPreference android:key="lock_sounds" android:title="@string/lock_sounds_enable_title" android:defaultValue="https://www.songbingjia.com/android/true" /> < !-- 触摸时振动--> < CheckBoxPreference android:key="haptic_feedback" android:title="@string/haptic_feedback_enable_title" android:defaultValue="https://www.songbingjia.com/android/true" /> < !-- 紧急提示音--> < ListPreference android:key="emergency_tone" android:title="@string/emergency_tone_title" android:entries="@array/emergency_tone_entries" android:entryValues="@array/emergency_tone_values" />

OK，接着我们在SoundSettings里面搜索关键字: sound_effects

private static final String KEY_SOUND_EFFECTS = "sound_effects";

接着搜索：KEY_SOUND_EFFECTS

// 触摸提示音相关 mSoundEffects = (CheckBoxPreference) findPreference(KEY_SOUND_EFFECTS); mSoundEffects.setPersistent(false); mSoundEffects.setChecked(Settings.System.getInt(resolver, Settings.System.SOUND_EFFECTS_ENABLED, 1) != 0);

@Override public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) { if (preference == mVibrateWhenRinging) { Settings.System.putInt(getContentResolver(), Settings.System.VIBRATE_WHEN_RINGING, mVibrateWhenRinging.isChecked() ? 1 : 0); } else if (preference == mDtmfTone) { Settings.System.putInt(getContentResolver(), Settings.System.DTMF_TONE_WHEN_DIALING, mDtmfTone.isChecked() ? 1 : 0); } else if (preference == mSoundEffects) { if (mSoundEffects.isChecked()) { mAudioManager.loadSoundEffects(); } else { mAudioManager.unloadSoundEffects(); } Settings.System.putInt(getContentResolver(), Settings.System.SOUND_EFFECTS_ENABLED, mSoundEffects.isChecked() ? 1 : 0); }

这里我们很容易的看清楚它的实例和点击监听，都是通过修改系统配置来进行操作的，那么这玩意到底在哪里整呢？
首先，触摸提示音，是对所有的view的点击时间都会有触发效果，那么我们看看View.java的类。
View.java有将近2万行，想研究的彻底很明显是不现实，或者说，不轻松的。那么我们搜素SOUND_EFFECTS_ENABLED 这个关键字

/** * View flag indicating whether this view should have sound effects enabled * for events such as clicking and touching. */ public static final int SOUND_EFFECTS_ENABLED = 0x08000000;

看注释，意思是是否启动声音效果。

/** * Set whether this view should have sound effects enabled for events such as * clicking and touching. * * < p> You may wish to disable sound effects for a view if you already play sounds, * for instance, a dial key that plays dtmf tones. * * @param soundEffectsEnabled whether sound effects are enabled for this view. * @see #isSoundEffectsEnabled() * @see #playSoundEffect(int) * @attr ref android.R.styleable#View_soundEffectsEnabled */ public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); }/** * @return whether this view should have sound effects enabled for events such as *clicking and touching. * * @see #setSoundEffectsEnabled(boolean) * @see #playSoundEffect(int) * @attr ref android.R.styleable#View_soundEffectsEnabled */ @ViewDebug.ExportedProperty public boolean isSoundEffectsEnabled() { return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); }

看到这2个方法我就有底了。很明显，我们要查看isSoundEffectsEnabled的调用关系。

/** * Play a sound effect for this view. * * < p> The framework will play sound effects for some built in actions, such as * clicking, but you may wish to play these effects in your widget, * for instance, for internal navigation. * * < p> The sound effect will only be played if sound effects are enabled by the user, and * {@link #isSoundEffectsEnabled()} is true. * * @param soundConstant One of the constants defined in {@link SoundEffectConstants} */ public void playSoundEffect(int soundConstant) { if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { return; } mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); }

【Android 触摸提示音】接着我们看谁调用了它，找到在Audioserveice.java中

/** @see AudioManager#playSoundEffect(int) */ public void playSoundEffect(int effectType) { playSoundEffectVolume(effectType, -1.0f); }/** @see AudioManager#playSoundEffect(int, float) */ public void playSoundEffectVolume(int effectType, float volume) { sendMsg(mAudioHandler, MSG_PLAY_SOUND_EFFECT, SENDMSG_QUEUE, effectType, (int) (volume * 1000), null, 0); }

写到这里，就是完了。接下来的需要，也就是对触摸音的资源文件的修改，它的位置在framework/base/data/sounds/effects 文件夹下。（同时这个文件夹的ogg下面也有一个相同的文件，这个我还不清楚）Effect_Tick.ogg。
对应的是在Android system/media/audio/ui Effect_Tick.ogg的文件。
想要修改它的话，可以在编译room的时候替换了它，或者push 一个新的同名文件。