Android 11 设置开机默认系统横屏显示

 Android系统默认是竖屏显示的,想要完成横屏显示，按以下步骤配置即可实现功能：

1.在目录frameworks/base/cmds/bootanimation/BootAnimation.cpp中修改

// create the native surface
 
sp control = session()->createSurface(String8("BootAnimation"),
 
- resolution.getWidth(), resolution.getHeight(), PIXEL_FORMAT_RGB_565);
 
+ resolution.getHeight(), resolution.getWidth(), PIXEL_FORMAT_RGB_565);
 
SurfaceComposerClient::Transaction t;
 
+ Rect destRect(resolution.getHeight(), resolution.getWidth());
 
+ t.setDisplayProjection(mDisplayToken, ui::ROTATION_90, destRect, destRect);
 
// this guest property specifies multi-display IDs to show the boot animation
 

2.在目录frameworks/base/core/java/com/android/internal/view/RotationPolicy.java修改

 public final class RotationPolicy {
 
private static final String TAG = "RotationPolicy";
 
private static final int CURRENT_ROTATION = -1;
 
- public static final int NATURAL_ROTATION = Surface.ROTATION_0;
 
+ public static final int NATURAL_ROTATION = Surface.ROTATION_90;
 
private RotationPolicy() {
 
}

3.在目录frameworks/base/services/core/java/com/android/server/wm/DisplayRotation.java修改

public class DisplayRotation {
 
 
- private int mRotation;
 
+ private int mRotation = 1;
 
 
int mLandscapeRotation; // default landscape
 
if (preferredRotation >= 0) {
 
return preferredRotation;}
 
- return Surface.ROTATION_0;
 
+ return Surface.ROTATION_90;
 
 

4.其次修改native层代码，frameworks/native/services/surfaceflinger/DisplayDevice.cpp

setPowerMode(args.initialPowerMode);
 
// initialize the display orientation transform.
 
- setProjection(ui::ROTATION_0, Rect::INVALID_RECT, Rect::INVALID_RECT);
 
+ setProjection(ui::ROTATION_90, Rect::INVALID_RECT, Rect::INVALID_RECT);
 
}
 
DisplayDevice::~DisplayDevice() = default;
void DisplayDevice::setProjection(ui::Rotation orientation, Rect viewport, Rect
if (!frame.isValid()) {
// the destination frame can be invalid if it has never been set,
// in that case we assume the whole display frame.
+ if( displayWidth < displayHeight)
+ frame = Rect(displayHeight, displayWidth);
+ else
frame = Rect(displayWidth, displayHeight);
}

5.然后再在frameworks/native/services/surfaceflinger/SurfaceFlinger.cpp

void SurfaceFlinger::onInitializeDisplays() {

DisplayState::eLayerStackChanged;

d.token = token;

d.layerStack = 0;

- d.orientation = ui::ROTATION_0;

+ d.orientation = ui::ROTATION_90;

d.frame.makeInvalid();

d.viewport.makeInvalid();

d.width = 0;

说明：文中修改部分+号代表增加 -代表删除  

至此 开机默认开机横屏功能已经配置完成 ！！！

觉得我写的号的兄弟给个赞！！！谢谢