android触屏震动以及震动强度修改

PhoneWindowManager.java：
在interceptKeyBeforeQueueing函数中
performHapticFeedbackLw(null, HapticFeedbackConstants.VIRTUAL_KEY, false);

这里把false改为true。

public boolean performHapticFeedbackLw(WindowState win, int effectId, boolean always) {
        final boolean hapticsDisabled = Settings.System.getInt(mContext.getContentResolver(),
                Settings.System.HAPTIC_FEEDBACK_ENABLED, 0) == 0;
        if (!always && (hapticsDisabled || mKeyguardMediator.isShowingAndNotHidden())) {
            return false;
        }
        long[] pattern = null;
        switch (effectId) {
            case HapticFeedbackConstants.LONG_PRESS:
                pattern = mLongPressVibePattern;
                break;
            case HapticFeedbackConstants.VIRTUAL_KEY:
                pattern = mVirtualKeyVibePattern;
                break;
            case HapticFeedbackConstants.KEYBOARD_TAP:
                pattern = mKeyboardTapVibePattern;
                break;
            case HapticFeedbackConstants.SAFE_MODE_DISABLED:
                pattern = mSafeModeDisabledVibePattern;
                break;
            case HapticFeedbackConstants.SAFE_MODE_ENABLED:
                pattern = mSafeModeEnabledVibePattern;
                break;
            default:
                return false;
        }
        if (pattern.length == 1) {
            // One-shot vibration
            mVibrator.vibrate(pattern[0]);
        } else {
            // Pattern vibration
            mVibrator.vibrate(pattern, -1);//震动起来，OH！
        }

这里的震动值是从mVirtualKeyVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_virtualKeyVibePattern);获得的。

对于震动时间是修改是在对应的xml中
frameworks/base/core/res/res/values/config.xml
    <!-- Vibrator pattern for feedback about touching a virtual key -->
    <integer-array name="config_virtualKeyVibePattern">
        <item>0</item>
        <item>10</item>
        <item>20</item>
        <item>30</item>
    </integer-array>

这个mVibrator是Vibrator.java中的class.