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android如何改變係統默認橫豎屏方向

https://blog.csdn.net/abc19842008/article/details/7543559

如何改變android默認的橫豎屏，修改源碼一個地方就可以了。

[java] view plain copy

public int rotationForOrientationLw(int orientation, int lastRotation,
boolean displayEnabled) {
if (mPortraitRotation < 0) {
// Initialize the rotation angles for each orientation once.
Display d = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (d.getWidth() > d.getHeight()) {
mPortraitRotation = Surface.ROTATION_90;
mLandscapeRotation = Surface.ROTATION_0;
mUpsideDownRotation = Surface.ROTATION_270;
mSeascapeRotation = Surface.ROTATION_180;
} else {
mPortraitRotation = Surface.ROTATION_0;
mLandscapeRotation = Surface.ROTATION_90;
mUpsideDownRotation = Surface.ROTATION_180;
mSeascapeRotation = Surface.ROTATION_270;
}
}
{
Log.i(TAG, "MediaPlayer.is not PlayingVideo");
synchronized (mLock) {
switch (orientation) {
case ActivityInfo.SCREEN_ORIENTATION_PORTRAIT:
//always return portrait if orientation set to portrait
//return mPortraitRotation;
return mUpsideDownRotation;
case ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE:
//always return landscape if orientation set to landscape
return mLandscapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT:
//always return portrait if orientation set to portrait
//return mUpsideDownRotation;
return mPortraitRotation;
case ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE:
//always return seascape if orientation set to reverse landscape
return mSeascapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE:
//return either landscape rotation based on the sensor
mOrientationListener.setAllow180Rotation(
isLandscapeOrSeascape(Surface.ROTATION_180));
return getCurrentLandscapeRotation(lastRotation);
case ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT:
mOrientationListener.setAllow180Rotation(
!isLandscapeOrSeascape(Surface.ROTATION_180));
return getCurrentPortraitRotation(lastRotation);
}
mOrientationListener.setAllow180Rotation(
orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR
|| orientation == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
// case for nosensor meaning ignore sensor and consider only lid
// or orientation sensor disabled
//or case.unspecified
if (mLidOpen) {
return mLidOpenRotation;
} else if (mDockMode == Intent.EXTRA_DOCK_STATE_CAR && mCarDockRotation >= 0) {
return mCarDockRotation;
} else if (mDockMode == Intent.EXTRA_DOCK_STATE_DESK && mDeskDockRotation >= 0) {
return mDeskDockRotation;
} else {
if (useSensorForOrientationLp(orientation)) {
return mOrientationListener.getCurrentRotation(lastRotation);
}
return Surface.ROTATION_0;
}
}
}
}

修改上麵倒數一行代碼把return Surface.ROTATION_0改為你要的方向，記得這個要和上麵的匹配，寬高不同，Surface.ROTATION_0也不同。因為代碼開頭就有

[java] view plain copy

if (mPortraitRotation < 0) {
// Initialize the rotation angles for each orientation once.
Display d = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (d.getWidth() > d.getHeight()) {
mPortraitRotation = Surface.ROTATION_90;
mLandscapeRotation = Surface.ROTATION_0;
mUpsideDownRotation = Surface.ROTATION_270;
mSeascapeRotation = Surface.ROTATION_180;
} else {
mPortraitRotation = Surface.ROTATION_0;
mLandscapeRotation = Surface.ROTATION_90;
mUpsideDownRotation = Surface.ROTATION_180;
mSeascapeRotation = Surface.ROTATION_270;
}
}

調試android記錄 —— 屏幕改為豎屏

https://hi.baidu.com/jsxhxcq/item/960ca20607ed24e1359902d2

在調試android時，項目需要將屏幕豎屏，而且沒有傳感器。

按照網上的要求在 build/target/product/core.mk 中

PRODUCT_POLICY := android.policy_phone //mid 改為phone

但是改完沒有任何反應。隨就追蹤下去

1. 係統啟動後執行 performEnableScreen()

performEnableScreen() --> mPolicy.enableScreenAfterBoot();->

windowmanagerservice.java
    public void enableScreenAfterBoot() {
        synchronized(mWindowMap) {
            if (mSystemBooted) {
                return;
            }
            mSystemBooted = true;
        }
2. 在其函數中調用updateRotation（）；

public void enableScreenAfterBoot() {
        readLidState();
        updateRotation(Surface.FLAGS_ORIENTATION_ANIMATION_DISABLE);
    }

void updateRotation(int animFlags) {
mPowerManager.setKeyboardVisibility(mLidOpen);
int rotation = Surface.ROTATION_0;

        if (mLidOpen) {
            rotation = mLidOpenRotation;
        } else if (mDockState == Intent.EXTRA_DOCK_STATE_CAR && mCarDockRotation >= 0) {
            rotation = mCarDockRotation;
        } else if (mDockState == Intent.EXTRA_DOCK_STATE_DESK && mDeskDockRotation >= 0) {
            rotation = mDeskDockRotation;
        }
        //if lid is closed orientation will be portrait
        try {
            //set orientation on WindowManager
            mWindowManager.setRotation(rotation, true,
                    mFancyRotationAnimation | animFlags);
        } catch (RemoteException e) {
            // Ignore
        }
    }

3. setRotation（）函數在 windowmanagerservices.java 中

static final boolean DEBUG_ORIENTATION = true; //打開調試信息

設置旋轉函數，下麵調用關係

setRotation() - > setRotationUnchecked() - > setRotationUncheckedLocked（）-> rotationForOrientationLw()

if (useSensorForOrientationLp(orientation)) {
                    // If the user has enabled auto rotation by default, do it.
                    int curRotation = mOrientationListener.getCurrentRotation();
                    return curRotation >= 0 ? curRotation : lastRotation;
                }

讓所有應用都橫屏顯示

https://blog.csdn.net/knock/article/details/7629585

frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

    public int rotationForOrientationLw(int orientation, int lastRotation,
            boolean displayEnabled) {
            // Initialize the rotation angles for each orientation once.
            Display d = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
                    .getDefaultDisplay();
            if (d.getWidth() > d.getHeight()) {
                mPortraitRotation = Surface.ROTATION_0;  //jeff. ROTATION_90;
                mLandscapeRotation = Surface.ROTATION_0;
                mUpsideDownRotation = Surface.ROTATION_90;  //jeff. 270;
                mSeascapeRotation = Surface.ROTATION_180;
            }

android屏幕旋轉在framework中的修改

https://blog.csdn.net/xulinguestc/article/details/6435957

在framework中修改，可以隨意修改屏幕0°指向的方向，其實也是framework層做的映射。修改HAL層來修改屏幕0°指向的方向應該也是可以的，還沒有試過，估計會複雜點，應該要修改觸摸屏的坐標，觸摸鍵值映射表，比較麻煩，其實沒什麼必要，修改framework層就可以搞定了。

平板電腦一般是默認橫屏，豎屏的APP程序，會自動旋轉90°，由於是順時針轉90°，需要改為逆時針轉90°；也就是要把portrait改逆時針轉90°，這樣就和手機一致，兼容很多gsensor遊戲，修改點如下：

PhoneWindowManager.java(//192.168.1.4/opt/android_froyo_smdk/frameworks/policies/base/phone/com/android/internal/policy/impl)


public int rotationForOrientationLw(int orientation, int lastRotation,


boolean displayEnabled) {

 


if (mPortraitRotation < 0) {


// Initialize the rotation angles for each orientation once.


Display d =((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))


.getDefaultDisplay();


if (d.getWidth() > d.getHeight()) {


mPortraitRotation = Surface.ROTATION_270;//Surface.ROTATION_90;


mLandscapeRotation =Surface.ROTATION_0;


} else {


mPortraitRotation =Surface.ROTATION_0;


mLandscapeRotation = Surface.ROTATION_270;//Surface.ROTATION_90;


}


}

以下是參考文章------------------------------------------------------------------------------------------------------

本行實現以後才發現，google在1.5到2.2這個過程中改進了很多，1.5修改豎屏比較麻煩，而2.2是相當的容易！
其實基本上google將之前版本的默認為豎屏的做法進行了改進，不需要再花費更多力氣在屏幕的默認橫豎切換上麵。1.還是kernel豎屏，可以顯示到屏幕出現"A N D R O I D"字樣
啟動參數裏加入fbcon=rotate:1 (0:正常屏; 1:順時鍾轉90度; 2:轉180度; 3:順時鍾轉270度;)
最後生成的autoconf.h裏有類似項：
#define CONFIG_CMDLINE "console=ttySAC0,115200 fbcon=rotate:1"此項的解析在$(kernel)/drivers/video/console/fbcon.c
static int __init fb_console_setup(char *this_opt);
隻是去初始化變量initial_rotation，然後initial_rotation會傳遞給其他需要的結構。
要選上：Device Drivers -> Graphics support -> Console display driver support ->Framebuffer Console support -> Framebuffer Console Rotation
注意：參考$(kernel)/documentation/fb/fbcon.txt2.android OS旋轉屏幕
froyo中已經相當容易，僅修改一處：
frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp
void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
{
mHw = hw; // initialize the display orientation transform.
// it's a constant that should come from the display driver.
// int displayOrientation = ISurfaceComposer::eOrientationDefault;
int displayOrientation = ISurfaceComposer::eOrientation90; //jeff.
。。。
}
或者隻在init.rc中增加一項：
setprop ro.sf.hwrotation 90就這麼簡單的一修改，就可以全程豎屏顯示了！

最後更新：2017-04-03 18:51:56

android如何改變係統默認橫豎屏方向

調試android記錄 —— 屏幕改為豎屏

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android如何改變係統默認橫豎屏方向

調試android記錄 —— 屏幕改為豎屏

上一篇： 小米的“文化麻醉”難長久

下一篇： 硬實時操作係統-RTLinux

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上一篇：小米的“文化麻醉”難長久

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