[移动开发]Android 10 应用全屏的时候弹出目前处于全屏模式对话框

现象：

需求：去掉目前处于全屏模式对话框
代码路径：
frameworks/base/core/res/res/values-zh-rCN/strings.xml
frameworks/basecore/res/res/layout/immersive_mode_cling.xml
frameworks/base/services/core/java/com/android/server/wm/ImmersiveModeConfirmation.java
frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java
在DisplayPolicy.java文件中updateSystemBarsLw()方法中，当我们的导航栏或者状态栏发生改变的时候就会调用该方法，其中immersiveModeChangedLw()该方法就是弹出目前处于全屏模式对话框处理

private Pair<Integer, Boolean> updateSystemBarsLw(WindowState win, int oldVis, int vis) {
   // update navigation bar
boolean oldImmersiveMode = isImmersiveMode(oldVis);
boolean newImmersiveMode = isImmersiveMode(vis);
if (oldImmersiveMode != newImmersiveMode) {
    final String pkg = win.getOwningPackage();
    mImmersiveModeConfirmation.immersiveModeChangedLw(pkg, newImmersiveMode,
            mService.mPolicy.isUserSetupComplete(),
            isNavBarEmpty(win.getSystemUiVisibility()));
}

vis = mNavigationBarController.updateVisibilityLw(transientNavBarAllowed, oldVis, vis);

final WindowState navColorWin = chooseNavigationColorWindowLw(
        mTopFullscreenOpaqueWindowState, mTopFullscreenOpaqueOrDimmingWindowState,
        mDisplayContent.mInputMethodWindow, mNavigationBarPosition);
vis = updateLightNavigationBarLw(vis, mTopFullscreenOpaqueWindowState,
        mTopFullscreenOpaqueOrDimmingWindowState,
        mDisplayContent.mInputMethodWindow, navColorWin);
     }

在ImmersiveModeConfirmation.java文件中就是添加窗口处理，其中包含显示和隐藏

private WindowManager.LayoutParams getClingWindowLayoutParams() {
    final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.MATCH_PARENT,
            WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL,
            WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                    | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
                    | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
            PixelFormat.TRANSLUCENT);
    lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
    lp.setTitle("ImmersiveModeConfirmation");
    lp.windowAnimations = com.android.internal.R.style.Animation_ImmersiveModeConfirmation;
    lp.token = getWindowToken();
    return lp;
}
private final class H extends Handler {
    private static final int SHOW = 1;
    private static final int HIDE = 2;

    H(Looper looper) {
        super(looper);
    }

    @Override
    public void handleMessage(Message msg) {
        switch(msg.what) {
            case SHOW:
                handleShow();
                break;
            case HIDE:
                handleHide();
                break;
        }
    }
}

解决办法：
可以在DisplayPolicy.java文件中updateSystemBarsLw()方法中注释掉该方法immersiveModeChangedLw

 // mImmersiveModeConfirmation.immersiveModeChangedLw(pkg, newImmersiveMode,
           //         mService.mPolicy.isUserSetupComplete(),
           //         isNavBarEmpty(win.getSystemUiVisibility()));