Android(安卓)touch sound

Step:
1.Main menu->Settings->Sound->Enable "Touch sounds"
2.Main menu->Settings->Display->Brightness->Mark&Unmark "Adapt to lighting conditions"
3.Check the phone sound.
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Actual result:
The phone will not feedback touch sounds when tap "Adapt to lighting conditions" in Brightness.

code:
BrightnessDialog.java (base\packages\systemui\src\com\android\systemui\settings)

quick_settings_brightness_dialog.xml:
<CheckBox android:id="@+id/brightness_mode"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/brightness_adapt_checkbox_information"
android:textAppearance="?android:attr/textAppearanceSmall"
android:layout_marginTop="6dip"
/>

View.java

    public boolean performClick() {        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);        ListenerInfo li = mListenerInfo;        if (li != null && li.mOnClickListener != null) {            playSoundEffect(SoundEffectConstants.CLICK);            li.mOnClickListener.onClick(this);            return true;        }        return false;    }

touch 声音是View playSoundEffect() 发出的。但是View的onClickListener 沒有設置的話， performClick() 是不會調用playSoundEffect（）的。

因为Brightness 的dialog的Checkbox 没有设置onClickListener ，所以click的时候没有声音。
所以只要给checkBox 设置个一onClickListener 就会有touch sound了。

同理测试一个Button 如果没有设置onClickListener， click时也不会有touch sound。

另外：

ViewRootImpl.java

    public void playSoundEffect(int effectId) {        checkThread();        if (mMediaDisabled) {            return;        }        try {            final AudioManager audioManager = getAudioManager();            switch (effectId) {                case SoundEffectConstants.CLICK:                    audioManager.playSoundEffect(AudioManager.FX_KEY_CLICK);                    return;

AudioManager.java

    public void  playSoundEffect(int effectType) {        if (effectType < 0 || effectType >= NUM_SOUND_EFFECTS) {            return;        }        if (!querySoundEffectsEnabled()) {            return;        }        IAudioService service = getService();        try {            service.playSoundEffect(effectType);        } catch (RemoteException e) {            Log.e(TAG, "Dead object in playSoundEffect"+e);        }    }     private boolean querySoundEffectsEnabled() {        return Settings.System.getInt(mContext.getContentResolver(), Settings.System.SOUND_EFFECTS_ENABLED, 0) != 0;    }

//当settings 的touch sounds 关闭后，就没有click的声音了。

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