android4.0强制横屏竖屏

最新推荐文章于 2022-05-06 17:37:29 发布

转载最新推荐文章于 2022-05-06 17:37:29 发布 · 680 阅读

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#竖屏显示 #Android 4.0

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本文介绍了两种在Android系统中实现屏幕方向控制的方法。一种是在WindowManagerService中通过计算应用程序的强制方向来设定屏幕方向，另一种是在SurfaceFlinger中通过设置显示硬件的属性来达到屏幕旋转的效果。

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方法一：

android4.0/frameworks/base/services/java/com/android/server/wm/WindowManagerService.java

 int computeForcedAppOrientationLocked() {

        int req = getOrientationFromWindowsLocked();

        if (req == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {

            req = getOrientationFromAppTokensLocked();

        }

        // req = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE; //强制横屏0度

    // req = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT; //强制竖屏左转90度

        return req;

    }

方法二：

android4.0/frameworks/base/services/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;

    char property[PROPERTY_VALUE_MAX];

    if (property_get("ro.sf.hwrotation", property, NULL) > 0) {

        //displayOrientation

        switch (atoi(property)) {

        case 0:

            displayOrientation = ISurfaceComposer::eOrientationDefault;

            break;

        case 90:

            displayOrientation = ISurfaceComposer::eOrientation90;

            break;

        case 180:

            displayOrientation = ISurfaceComposer::eOrientation180;

            break;

        case 270:

            displayOrientation = ISurfaceComposer::eOrientation270;

            break;

        }

    }

    /* 强制旋转90度 */

    displayOrientation = ISurfaceComposer::eOrientation90;

    const float w = hw->getWidth();

    const float h = hw->getHeight();

    GraphicPlane::orientationToTransfrom(displayOrientation, w, h,

            &mDisplayTransform);

}