Question

我正在运行带有android pie的设备，并希望以编程方式从我的应用程序内更改过扫描。因此，我完成了以下操作：

通过adb授予了我的应用WRITE_SECURE_SETTINGS

问题

代码here让我相信，setOverscan内应该有一个IWindowManager$Stub方法，但没有。我是在做错事还是只是无法按照自己想做的方式去做我想做的事？

我的代码显示hasNavigationBar正常工作，但是setOverscanMode方法无效，并因java.lang.NoSuchMethodException: android.view.IWindowManager$Stub$Proxy.setOverscan [int, int, int, int, int]而失败

代码

object WindowTool {

    // WindowManager source code: https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/view/IWindowManager.aidl

    fun getWindowManagerService(): Any {
        val serviceManager = Class.forName("android.os.ServiceManager")
        val serviceBinder = serviceManager.getMethod("getService", String::class.java).invoke(serviceManager, Context.WINDOW_SERVICE) as IBinder
        val stub = Class.forName("android.view.IWindowManager\$Stub")
        return stub.getMethod("asInterface", IBinder::class.java).invoke(stub, serviceBinder)
    }

    fun setOverscanMode(v1: Int, v2: Int, v3: Int, v4: Int): Boolean {
        try {

            val windowManagerService = getWindowManagerService()
            for (m in windowManagerService.javaClass.methods) {
                L.d { "Method: $m" }
            }
            val setOverscan = windowManagerService.javaClass.getMethod("setOverscan", Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE)
            setOverscan.invoke(windowManagerService, 0, v1, v2, v3, v4)
            return true
        } catch (e: Exception) {
            L.e(e)
            return false
        }

    }

    fun hasNavigationBar(): Boolean? {
        try {
            val windowManagerService = getWindowManagerService()
            val hasNavigationBar = windowManagerService.javaClass.getMethod("hasNavigationBar")
            val res = hasNavigationBar.invoke(windowManagerService) as Boolean
            L.d { "hasNavigationBar: $res" }
            return res
        } catch (e: Exception) {
            L.e(e)
            return null
        }

    }
}

Answer 1

这里的代码让我相信，IWindowManager $ Stub中应该有一个setOverscan方法，但没有。我是在做错事还是只是无法按照自己想做的方式去做我想做的事？

在这种情况下，无法拨打电话getMethod。请参阅以下代码以获取和调用setOverscan方法：

object WindowManagerHackery {

    @SuppressLint("PrivateApi")
    @Throws(OverscanInvocationError::class)
    fun setOverscan(displayId: Int = Display.DEFAULT_DISPLAY, left: Int = 0, top: Int = 0, right: Int = 0, bottom: Int = 0) {
        try {
            val ServiceManager = Class.forName("android.os.ServiceManager")
            val service = ServiceManager.getMethod("getService", String::class.java)
            val binder = service.invoke(null, "window") as IBinder
            val windowManagerStub = Class.forName("android.view.IWindowManager").classes[0]
            val serviceObj = windowManagerStub.getMethod("asInterface", IBinder::class.java).invoke(null, binder)
            windowManagerStub.methods.first { it.name == "setOverscan" }
                    .invoke(serviceObj, displayId, left, top, right, bottom)
        } catch (e: Exception) {
            throw OverscanInvocationError(e)
        }
    }

    class OverscanInvocationError(e: Exception) : Exception(e)

}

用法：

WindowManagerHackery.setOverscan(bottom = overscanOffset)

您将需要android.permission.WRITE_SECURE_SETTINGS。我还将检查https://github.com/tiann/FreeReflection对API 28的支持，但是如果您打算在市场上发布，我不确定Google Play是否有禁止将此库包含在APK中的政策。

IWindowManager-通过反射调用setOverscan

1 个答案: