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拆解步骤

1、app 强制横屏显示，无视 android:screenOrientation="portrait" 属性

2、屏幕触摸坐标修改为横屏

3、开机动画横屏

4、开机logo、关机充电动画横屏

5、RecoveryUI 横屏

上代码

1、app 强制横屏显示

修改 rotationForOrientationLw(), 默认返回 270

frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java

@Override
    public int rotationForOrientationLw(int orientation, int lastRotation, boolean defaultDisplay) {
        ....

        synchronized (mLock) {
        ...

        default:
                    // For USER, UNSPECIFIED, NOSENSOR, SENSOR and FULL_SENSOR,
                    // just return the preferred orientation we already calculated.
                    if (preferredRotation >= 0) {
                        return preferredRotation;
                    }
                    
                    // return Surface.ROTATION_0;
                    return Surface.ROTATION_270;//cczheng add for land scap
            }
        }
  }

activity 默认强制属性为 SCREEN_ORIENTATION_LANDSCAPE

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

boolean updateOrientationFromAppTokensLocked(int displayId, boolean forceUpdate) {
        long ident = Binder.clearCallingIdentity();
        try {
            final DisplayContent dc = mRoot.getDisplayContent(displayId);
            // final int req = dc.getOrientation();
            int req = android.content.pm.ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;//cczheng add for land scap
            if (req != dc.getLastOrientation() || forceUpdate) {
                if (DEBUG_ORIENTATION) {
                    Slog.v(TAG, "updateOrientation: req= " + req + ", mLastOrientation= "
                        + dc.getLastOrientation(), new Throwable("updateOrientation"));
                }
                dc.setLastOrientation(req);
                //send a message to Policy indicating orientation change to take
                //action like disabling/enabling sensors etc.,
                // TODO(multi-display): Implement policy for secondary displays.
                if (dc.isDefaultDisplay) {
                    mPolicy.setCurrentOrientationLw(req);
                }
                return dc.updateRotationUnchecked(forceUpdate);
            }
            return false;
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

DisPlayContent 显示 mRotation 默认改为 3 (270)

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

/**
     * Current rotation of the display.
     * Constants as per {@link android.view.Surface.Rotation}.
     *
     * @see #updateRotationUnchecked()
     */
    // private int mRotation = 0;
    private int mRotation = 3;//cczheng add for land scap

修改默认值 config_reverseDefaultRotation 为 true，翻转显示角度

frameworks\base\core\res\res\values\config.xml

<!-- If true, the direction rotation is applied to get to an application's requested
         orientation is reversed.  Normally, the model is that landscape is
         clockwise from portrait; thus on a portrait device an app requesting
         landscape will cause a clockwise rotation, and on a landscape device an
         app requesting portrait will cause a counter-clockwise rotation.  Setting
         true here reverses that logic. -->
    <!-- cczheng add for land scap -->
    <bool name="config_reverseDefaultRotation">true</bool> 

    <!-- The number of degrees to rotate the display when the keyboard is open.
         A value of -1 means no change in orientation by default. -->
    <!-- cczheng add for land scap -->
    <integer name="config_lidOpenRotation">270</integer>

2、屏幕触摸坐标修改为横屏

对调 frame 的宽和高,设置方向为 270

frameworks\native\services\surfaceflinger\DisplayDevice.cpp

void DisplayDevice::setProjection(int orientation,
        const Rect& newViewport, const Rect& newFrame) {
    Rect viewport(newViewport);
    Rect frame(newFrame);

    const int w = mDisplayWidth;
    const int h = mDisplayHeight;

    Transform R;
    DisplayDevice::orientationToTransfrom(orientation, w, h, &R);

    if (!frame.isValid()) {
        // the destination frame can be invalid if it has never been set,
        // in that case we assume the whole display frame.
        //cczheng add for land scap
        // frame = Rect(w, h);
        if (w < h)
            frame = Rect(h, w);
        else
            frame = Rect(w, h);
    }
    ....

}

// clang-format off
DisplayDevice::DisplayDevice(
        const sp<SurfaceFlinger>& flinger,
        DisplayType type,
        int32_t hwcId,
        bool isSecure,
        const wp<IBinder>& displayToken,
        const sp<ANativeWindow>& nativeWindow,
        const sp<DisplaySurface>& displaySurface,
        std::unique_ptr<RE::Surface> renderSurface,
        int displayWidth,
        int displayHeight,
        bool hasWideColorGamut,
        const HdrCapabilities& hdrCapabilities,
        const int32_t supportedPerFrameMetadata,
        const std::unordered_map<ColorMode, std::vector<RenderIntent>>& hwcColorModes,
        int initialPowerMode)

      .....

    mHdrCapabilities = HdrCapabilities(types, maxLuminance, maxAverageLuminance, minLuminance);

    // initialize the display orientation transform.
    // setProjection(DisplayState::eOrientationDefault, mViewport, mFrame);
    //cczheng add for land scap
    setProjection(DisplayState::eOrientation270, mViewport, mFrame);
#ifdef MTK_SF_DEBUG_SUPPORT
    mFps = FpsCounterLoader::getInstance().create();
#endif
}

frameworks\native\services\surfaceflinger\SurfaceFlinger.cpp

void SurfaceFlinger::onInitializeDisplays() {
    // reset screen orientation and use primary layer stack
    Vector<ComposerState> state;
    Vector<DisplayState> displays;
    DisplayState d;
    d.what = DisplayState::eDisplayProjectionChanged |
             DisplayState::eLayerStackChanged;
    d.token = mBuiltinDisplays[DisplayDevice::DISPLAY_PRIMARY];
    d.layerStack = 0;
    //d.orientation = DisplayState::eOrientationDefault;
    //cczheng add for land scap
    d.orientation = DisplayState::eOrientation270;
    d.frame.makeInvalid();
    d.viewport.makeInvalid();
    d.width = 0;
    d.height = 0;
    displays.add(d);

    ....
}

3、开机动画横屏

对调 createSurface() 的 w 和 h

frameworks\base\cmds\bootanimation\BootAnimation.cpp

status_t BootAnimation::readyToRun() {
    mAssets.addDefaultAssets();

    sp<IBinder> dtoken(SurfaceComposerClient::getBuiltInDisplay(
            ISurfaceComposer::eDisplayIdMain));
    DisplayInfo dinfo;
    status_t status = SurfaceComposerClient::getDisplayInfo(dtoken, &dinfo);
    if (status)
        return -1;

    // create the native surface
    /*sp<SurfaceControl> control = session()->createSurface(String8("BootAnimation"),
            dinfo.w, dinfo.h, PIXEL_FORMAT_RGB_565);*/

    //cczheng add for land scap  [S]
    sp<SurfaceControl> control;
    if(dinfo.w < dinfo.h)
        control = session()->createSurface(String8("BootAnimation"),
            dinfo.h, dinfo.w, PIXEL_FORMAT_RGB_565);
    else
        control = session()->createSurface(String8("BootAnimation"),
            dinfo.w, dinfo.h, PIXEL_FORMAT_RGB_565);
    //cczheng add for land scap  [E]

    SurfaceComposerClient::Transaction t;
    t.setLayer(control, 0x40000000)
        .apply();

    .....

}

开机动画制作替换后面补充。。。

4、开机logo、关机充电动画横屏

开机logo定义屏幕分辨率以对应资源文件夹的位置为

vendor\mediatek\proprietary\bootable\bootloader\lk\project\xxxx.mk 没有则看下面的

device\mediateksample\xxxx\ProjectConfig.mk

mk 中的 BOOT_LOGO = wxga

对应的资源文件位置在 vendor/mediatek/proprietary/bootable/bootloader/lk/dev/logo/wxga

可以看到 wxga 中都是竖屏的图片，而 wxganl 中已经是横屏的图片

则我们将 BOOT_LOGO 修改为 wxganl 即可

接下来还需要继续修改显示的角度，依旧改成 270，不然会出现花屏的现象

开机第一张图片 uboot 对应显示

vendor\mediatek\proprietary\bootable\bootloader\lk\platform\mt6765\mt_logo.c

void init_fb_screen()
{
    .....

    // in JB2.MP need to allign width and height to 32 ,but jb5.mp needn't
    phical_screen.needAllign = 1;
    phical_screen.allignWidth = ALIGN_TO(CFG_DISPLAY_WIDTH, MTK_FB_ALIGNMENT);

    /* In GB, no need to adjust 180 showing logo ,for fb driver dealing the change */
    /* but in JB, need adjust it for screen 180 roration           */
    phical_screen.need180Adjust = 0;   // need sync with chip driver

    dprintf(INFO, "[lk logo: %s %d]MTK_LCM_PHYSICAL_ROTATION = %s\n",__FUNCTION__,__LINE__, MTK_LCM_PHYSICAL_ROTATION);

    if (0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "270", 3)) {
        phical_screen.rotation = 270;
    } else if (0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "90", 2)) {
        phical_screen.rotation = 90;
    } else if (0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "180", 3) && (phical_screen.need180Adjust == 1)) {
        phical_screen.rotation = 180;
    } else {
        phical_screen.rotation = 270;//cczheng add for land scap
    }

    ....

开机第二张图片 kernel 对应显示

vendor\mediatek\proprietary\external\libshowlogo\charging_animation.cpp

int anim_fb_init(void)
{
     .....

    phical_screen.needAllign = 1;
    phical_screen.need180Adjust = 1;
    phical_screen.fb_size = fb_size;
    if (MTK_LOG_ENABLE == 1) {
        SLOGD("[libshowlogo: %s %d]MTK_LCM_PHYSICAL_ROTATION = %s\n",__FUNCTION__,__LINE__, MTK_LCM_PHYSICAL_ROTATION);
    }

    if(0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "270", 3))
    {
        phical_screen.rotation = 270;
    } else if(0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "90", 2)){
        phical_screen.rotation = 90;
    } else if(0 == strncmp(MTK_LCM_PHYSICAL_ROTATION, "180", 3) && (phical_screen.need180Adjust == 1)){
        phical_screen.rotation = 180;
    } else {
        phical_screen.rotation = 270;//cczheng add for land scap
    }
    if (MTK_LOG_ENABLE == 1) {
        SLOGD("[libshowlogo]phical_screen: width= %d,height= %d,bits_per_pixel =%d,needAllign = %d,allignWidth=%d rotation =%d ,need180Adjust = %d\n",
                phical_screen.width, phical_screen.height,
                phical_screen.bits_per_pixel, phical_screen.needAllign,
                phical_screen.allignWidth, phical_screen.rotation, phical_screen.need180Adjust);
        SLOGD("[libshowlogo: %s %d]show old animtion= 1, running show_animationm_ver %d\n",__FUNCTION__,__LINE__, show_animationm_ver);
        SLOGD("[libshowlogo: %s %d]draw_anim_mode = 1, running mode %d\n",__FUNCTION__,__LINE__, draw_anim_mode);
    }

    return 0;
}

如果出现充电动画图片错位的现象，多数都是因为图形绘制点和屏幕尺寸不匹配导致的。可通过调整 cust_display.h 中位置参数

Android M 后：/vendor/mediatek/proprietary/external/libshowlogo/cust_display.h

Android M 前： /vendor/mediatek/proprietary/bootable/bootloader/lk/target/${PROJECT}/include/target/cust_display.h

(1 ，使用old version动画方案的调整如下设置，

#define BAR_LEFT (215)
#define BAR_TOP (156)
#define BAR_RIGHT (265)
#define BAR_BOTTOM (278)
可以用windows的画图软件打开第1点里提到的图片，根据电池边框的像素来调整。

这里坐标的参考原点是左上角，背景图片的左上角是(0,0)，这四个值都是相对于左上角的坐标来确定的，因此RIGHT > LEFT，BOTTOM > TOP
小技巧：1)打开画图软件，选择 查看->缩放->自定义，将图片放到到800%
2)选择 查看->缩放->显示网格
这样就可以看到一个一个的像素
(2，使用new version动画方案调整如下设置：

#define CAPACITY_LEFT (278) 
#define CAPACITY_TOP (556)
#define CAPACITY_RIGHT (441)
#define CAPACITY_BOTTOM (817)

5、RecoveryUI 横屏

参考之前写的文章 MTK Recovery 模式横屏修改(适用于6.0 + 8.1+9.0)

6、系统导航栏位置调整，横屏后 navigationBarPosition 默认在左边

作为平板项目，需要将位置改为底部,直接修改 navigationBarPosition() 返回 NAV_BAR_BOTTOM

frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java

@NavigationBarPosition
    private int navigationBarPosition(int displayWidth, int displayHeight, int displayRotation) {
        //cchzneg annotaion for land scape
        /*if (mNavigationBarCanMove && displayWidth > displayHeight) {
            if (displayRotation == Surface.ROTATION_270) {
                return NAV_BAR_LEFT;
            } else {
                return NAV_BAR_RIGHT;
            }
        }*/
        return NAV_BAR_BOTTOM;
    }

这样位置是变为底部了，但是三个按钮都重叠在一起了，需要修改 SystemUI 的布局显示

vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarView.java

private void updateRotatedViews() {
        //cczheng change rot0 rot90 for landscape
        mRotatedViews[Surface.ROTATION_0] =
                mRotatedViews[Surface.ROTATION_180] = findViewById(R.id.rot90);
                // mRotatedViews[Surface.ROTATION_180] = findViewById(R.id.rot0);
        mRotatedViews[Surface.ROTATION_270] =
                mRotatedViews[Surface.ROTATION_90] = findViewById(R.id.rot0);
                // mRotatedViews[Surface.ROTATION_90] = findViewById(R.id.rot90);        

        updateCurrentView();
    }

顺带再调整下 NavigationBarView 的默认高度和左边 Back 键区域太大的问题

vendor\mediatek\proprietary\packages\apps\SystemUI\src\com\android\systemui\statusbar\phone\NavigationBarInflaterView.java

private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {
        View v = null;
        String button = extractButton(buttonSpec);
        if (LEFT.equals(button)) {
             //cchzheng change NAVSPACE to MENU_IME for small left back click area
            String s = Dependency.get(TunerService.class).getValue(NAV_BAR_LEFT, MENU_IME_ROTATE/*NAVSPACE*/);
            button = extractButton(s);
        } else if (RIGHT.equals(button)) {
            String s = Dependency.get(TunerService.class).getValue(NAV_BAR_RIGHT, MENU_IME_ROTATE);
            button = extractButton(s);
        }

        ...

frameworks\base\core\res\res\values\dimens.xml

<!-- Height of the bottom navigation / system bar. -->
    <!--cczheng change 48dp to 30dp-->
    <dimen name="navigation_bar_height">30dp</dimen>

ok，这样就大功告成了，完美的横屏适配