android 4.4 禁止下拉,android4.4上全屏界面实现禁止状态栏下拉

2. frameworks\base\policy\src\com\android\internal\policy\impl\PhoneWindowManager.java

// monitor for system gestures

mSystemGestures = new SystemGesturesPointerEventListener(context,

new SystemGesturesPointerEventListener.Callbacks() {

@Override

public void onSwipeFromTop() {

+ if (isGestureIsolated())

+ return;

if (mStatusBar != null) {

requestTransientBars(mStatusBar);

}

}

@Override

public void onSwipeFromBottom() {

+ if (isGestureIsolated())

+ return;

if (mNavigationBar != null && mNavigationBarOnBottom) {

requestTransientBars(mNavigationBar);

}

}

@Override

public void onSwipeFromRight() {

+ if (isGestureIsolated())

+ return;

if (mNavigationBar != null && !mNavigationBarOnBottom) {

requestTransientBars(mNavigationBar);

}

}

@Override

public void onDebug() {

// no-op

}

+ private boolean isGestureIsolated() {

+ WindowState win = mFocusedWindow != null ? mFocusedWindow : mTopFullscreenOpaqueWindowState;

+ if (win != null && (win.getSystemUiVisibility() & View.SYSTEM_UI_FLAG_IMMERSIVE_GESTURE_ISOLATED) != 0)

+ return true;

+ else

+ return false;

+ }

});