Android 触摸提示音【转】

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 {

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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);

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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="true" />
    <!-- 触摸提示音-->
    <CheckBoxPreference
            android:key="sound_effects"
            android:title="@string/sound_effects_enable_title"
            android:defaultValue="true" />

    <!-- 锁屏提示音-->
    <CheckBoxPreference
            android:key="lock_sounds"
            android:title="@string/lock_sounds_enable_title"
            android:defaultValue="true" />
    <!-- 触摸时振动-->
    <CheckBoxPreference
            android:key="haptic_feedback"
            android:title="@string/haptic_feedback_enable_title"
            android:defaultValue="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" />

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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";

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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);

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    @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);

        }

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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;

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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);
    }

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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);
    }

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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);
    }

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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。