ARTICLE AD BOX
I'm working on an Xposed module that aims to hide certain system windows (like OPPO's zoom windows, long screenshot UI) by dynamically adding the FLAG_SECURE flag to their surfaces when they are created. This was functional on older Android versions using the now-removed com.android.server.wm.WindowSurfaceController class.
import de.robv.android.xposed.IXposedHookLoadPackage; import de.robv.android.xposed.XC_MethodHook; import de.robv.android.xposed.XC_MethodReplacement; import de.robv.android.xposed.XposedBridge; import de.robv.android.xposed.XposedHelpers; import de.robv.android.xposed.callbacks.XC_LoadPackage; public class Entry implements IXposedHookLoadPackage { @Override public void handleLoadPackage(final XC_LoadPackage.LoadPackageParam lpparam) throws Throwable { if (!"android".equals(lpparam.packageName)) return; XposedBridge.log("OplusHideZoom: hooking ColorOS WindowSurfaceController"); int FLAG_SECURE = 0x00000040; try { Class<?> lpClass = XposedHelpers.findClass("android.view.WindowManager$LayoutParams", lpparam.classLoader); FLAG_SECURE = XposedHelpers.getStaticIntField(lpClass, "FLAG_SECURE"); } catch (Throwable t) { XposedBridge.log("OplusHideZoom: fallback FLAG_SECURE"); } Class<?> windowStateAnimatorClass = XposedHelpers.findClass("com.android.server.wm.WindowStateAnimator", lpparam.classLoader); Class<?> surfaceSessionClass = XposedHelpers.findClass("android.view.SurfaceSession", lpparam.classLoader); Class<?> oplusExtClass = null; try { oplusExtClass = XposedHelpers.findClass("com.oplus.wms.OplusWindowSurfaceControllerExt", lpparam.classLoader); XposedBridge.log("OplusHideZoom: found OplusWindowSurfaceControllerExt"); } catch (Throwable ignored) {} // try { if (oplusExtClass != null) { XposedHelpers.findAndHookConstructor( "com.android.server.wm.WindowSurfaceController", lpparam.classLoader, windowStateAnimatorClass, surfaceSessionClass, String.class, int.class, int.class, oplusExtClass, new WindowHook(FLAG_SECURE, windowStateAnimatorClass)); XposedBridge.log("OplusHideZoom: hooked with Oplus ext signature"); } } catch (Throwable e) { XposedBridge.log("OplusHideZoom: hook with Oplus ext failed: " + e); } // try { XposedHelpers.findAndHookConstructor( "com.android.server.wm.WindowSurfaceController", lpparam.classLoader, windowStateAnimatorClass, surfaceSessionClass, String.class, int.class, int.class, new WindowHook(FLAG_SECURE, windowStateAnimatorClass)); XposedBridge.log("OplusHideZoom: hooked default WindowSurfaceController"); } catch (Throwable e) { XposedBridge.log("OplusHideZoom: default hook failed: " + e); } try { XposedHelpers.findAndHookMethod( "com.android.server.wm.Task", lpparam.classLoader, "getShadowRadius", boolean.class, XC_MethodReplacement.returnConstant(0.0f)); } catch (Throwable t) { XposedBridge.log("OplusHideZoom: failed to hook getShadowRadius: " + t); } try { XposedHelpers.findAndHookMethod( "com.android.server.wm.Task", lpparam.classLoader, "setWindowingModeInSurfaceTransaction", int.class, boolean.class, new XC_MethodHook() { @Override protected void afterHookedMethod(MethodHookParam param) { try { Object windowState = XposedHelpers.callMethod(param.thisObject, "getTopVisibleAppMainWindow"); Object root = XposedHelpers.getObjectField(param.thisObject, "mRootWindowContainer"); if (windowState != null) { XposedHelpers.callMethod(windowState, "destroySurfaceUnchecked"); if (root != null) XposedHelpers.callMethod(root, "resumeFocusedTasksTopActivities"); } } catch (Throwable ignored) {} } }); } catch (Throwable e) { XposedBridge.log("OplusHideZoom: failed to hook setWindowingModeInSurfaceTransaction: " + e); } } static class WindowHook extends XC_MethodHook { private final int FLAG_SECURE; private final Class<?> windowStateAnimatorClass; WindowHook(int flag, Class<?> animatorCls) { this.FLAG_SECURE = flag; this.windowStateAnimatorClass = animatorCls; } @Override protected void beforeHookedMethod(MethodHookParam param) { try { Object winAnimator = null; for (Object arg : param.args) { if (arg != null && windowStateAnimatorClass.isInstance(arg)) { winAnimator = arg; break; } } if (winAnimator == null) return; Object winState = XposedHelpers.getObjectField(winAnimator, "mWin"); String tag = String.valueOf(XposedHelpers.callMethod(winState, "getWindowTag")); String pkg = (String) XposedHelpers.callMethod(winState, "getOwningPackage"); int flagsIndex = -1; for (int i = param.args.length - 1; i >= 0; i--) { if (param.args[i] instanceof Integer) { flagsIndex = i; break; } } if (flagsIndex == -1) return; int flags = (int) param.args[flagsIndex]; boolean needHide = false; if (tag.contains("LongshotCapture") || tag.contains("ZoomFloatHandleView") || "InputMethod".equals(tag) || "com.oplus.appplatform".equals(pkg) || "com.coloros.smartsidebar".equals(pkg)) { needHide = true; } // is zoomed window try { Object ext = XposedHelpers.getObjectField(winState, "mWindowStateExt"); if (ext != null) { int mode = (int) XposedHelpers.callMethod(winState, "getWindowingMode"); boolean zoom = (boolean) XposedHelpers.callMethod(ext, "checkIfWindowingModeZoom", mode); if (zoom) needHide = true; } } catch (Throwable ignored) {} if (needHide) { flags |= FLAG_SECURE; param.args[flagsIndex] = flags; XposedBridge.log("OplusHideZoom: FLAG_SECURE -> " + tag + " / " + pkg); } } catch (Throwable t) { XposedBridge.log("OplusHideZoom: error in beforeHookedMethod: " + t); } } } }