Android 强制第三方应用横屏显示

第三方应用横屏显示

基于RK3399，Android11

屏幕方向旋转

当系统状态改变，需要重新更新方向时，就会调用
\frameworks\base\services\core\java\com\android\server\wm\WindowManagerService.java
会执行displayContent.updateRotationUnchecked()

    @Overridepublic void updateRotation(boolean alwaysSendConfiguration, boolean forceRelayout) {updateRotationUnchecked(alwaysSendConfiguration, forceRelayout);}private void updateRotationUnchecked(boolean alwaysSendConfiguration, boolean forceRelayout) {ProtoLog.v(WM_DEBUG_ORIENTATION, "updateRotationUnchecked:"+ " alwaysSendConfiguration=%b forceRelayout=%b",alwaysSendConfiguration, forceRelayout);Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "updateRotation");long origId = Binder.clearCallingIdentity();try {synchronized (mGlobalLock) {boolean layoutNeeded = false;final int displayCount = mRoot.mChildren.size();for (int i = 0; i < displayCount; ++i) {final DisplayContent displayContent = mRoot.mChildren.get(i);Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "updateRotation: display");final boolean rotationChanged = displayContent.updateRotationUnchecked();Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);

\frameworks\base\services\core\java\com\android\server\wm\DisplayContent.java

/*** Update rotation of the display.** @return {@code true} if the rotation has been changed.  In this case YOU MUST CALL*         {@link #sendNewConfiguration} TO UNFREEZE THE SCREEN.*/boolean updateRotationUnchecked() {return mDisplayRotation.updateRotationUnchecked(false /* forceUpdate */);}

强制横屏

\frameworks\base\services\core\java\com\android\server\wm\DisplayRotation.java
修改updateRotationUnchecked()，直接返回

    boolean updateRotationUnchecked(boolean forceUpdate) {if(true){return true;}final int displayId = mDisplayContent.getDisplayId();if (!forceUpdate) {if (mDeferredRotationPauseCount > 0) {// Rotation updates have been paused temporarily. Defer the update until updates// have been resumed.ProtoLog.v(WM_DEBUG_ORIENTATION, "Deferring rotation, rotation is paused.");return false;}......

\frameworks\base\services\core\java\com\android\server\wm\DisplayContent.java
修改 getOrientation()，直接返回横屏，无视activity的android:screenOrientation属性
否则可能会出现应用先竖屏再旋转为横屏的现象

/*** In the general case, the orientation is computed from the above app windows first. If none of* the above app windows specify orientation, the orientation is computed from the child window* container, e.g. {@link ActivityRecord#getOrientation(int)}.*/@ScreenOrientation@Overrideint getOrientation() {if(true){return ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;}mLastOrientationSource = null;if (mIgnoreRotationForApps) {return SCREEN_ORIENTATION_USER;}......