Android 触摸提示音

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">        <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" />        <Preference            android:key="musicfx"            android:title="@string/musicfx_title">        <intent android:targetPackage="com.android.musicfx"                android:targetClass="com.android.musicfx.ControlPanelPicker" />    Preference>        <PreferenceCategory            android:key="category_calls_and_notification"            android:title="@string/sound_category_call_ringtone_vibrate_title"/>        <com.android.settings.DefaultRingtonePreference            android:key="ringtone"            android:title="@string/ringtone_title"            android:dialogTitle="@string/ringtone_title"            android:persistent="false"            android:ringtoneType="ringtone" />        <CheckBoxPreference         android:key="vibrate_when_ringing"         android:title="@string/vibrate_when_ringing_title"         android:persistent="false" />        <PreferenceCategory            android:title="@string/sound_category_system_title"/>            <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" />        <CheckBoxPreference            android:key="dtmf_tone"            android:title="@string/dtmf_tone_enable_title"            android:defaultValue="true" />        <CheckBoxPreference            android:key="sound_effects"            android:title="@string/sound_effects_enable_title"            android:defaultValue="true" />        <CheckBoxPreference            android:key="lock_sounds"            android:title="@string/lock_sounds_enable_title"            android:defaultValue="true" />        <CheckBoxPreference            android:key="haptic_feedback"            android:title="@string/haptic_feedback_enable_title"            android:defaultValue="true" />        <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.     *     * 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.     *     * 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.     *     * 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);    }

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。

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