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.