Android横屏状态下返回到壁纸界面屏幕刷新问题

前两款android智能机开发过程中曾经遇到过在launcher主屏界面上建一个应用快捷图标，在横屏的状态下点击打开此应用，然后按返回键，很大概率上屏幕会刷新失败，显示半屏黑屏，是由于关闭当前activity时是横屏状态，关闭后返回到壁纸界面是竖屏，windowManagerService刷新处理问题。现将解决方案贴出来，望以后遇到此问题的同学借鉴：

            boolean gone = win.mViewVisibility == View.GONE
                    || !win.mRelayoutCalled
                    || win.mRootToken.hidden
                    || (atoken != null && atoken.hiddenRequested)
                    || win.mAttachedHidden
                    || win.mExiting || win.mDestroying;

            if (!win.mLayoutAttached) {
                if (DEBUG_LAYOUT) Slog.v(TAG, "First pass " + win
                        + ": gone=" + gone + " mHaveFrame=" + win.mHaveFrame
                        + " mLayoutAttached=" + win.mLayoutAttached);
                if (DEBUG_LAYOUT && gone) Slog.v(TAG, " (mViewVisibility="
                        + win.mViewVisibility + " mRelayoutCalled="
                        + win.mRelayoutCalled + " hidden="
                        + win.mRootToken.hidden + " hiddenRequested="
                        + (atoken != null && atoken.hiddenRequested)
                        + " mAttachedHidden=" + win.mAttachedHidden);
            }

            if (win.mIsWallpaper)
            {
                gone = win.mViewVisibility == View.GONE
                        || !win.mRelayoutCalled
                        || (atoken != null && atoken.hiddenRequested)
                        || win.mAttachedHidden
                        || win.mExiting || win.mDestroying;
            }

            // If this view is GONE, then skip it -- keep the current
            // frame, and let the caller know so they can ignore it
            // if they want. (We do the normal layout for INVISIBLE
            // windows, since that means "perform layout as normal,
            // just don't display").
            if (!gone || !win.mHaveFrame) {
                if (!win.mLayoutAttached) {
                    mPolicy.layoutWindowLw(win, win.mAttrs, null);
                    win.mLayoutSeq = seq;
                    if (DEBUG_LAYOUT) Slog.v(TAG, "-> mFrame="
                            + win.mFrame + " mContainingFrame="
                            + win.mContainingFrame + " mDisplayFrame="
                            + win.mDisplayFrame);
                } else {
                    if (topAttached < 0) topAttached = i;
                }
            }

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