Add vr platform lib

# Copyright (C) 2017 The Android Open Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

LOCAL_PATH := $(call my-dir)

# Library to perform dlopen on the actual shared library.

include $(CLEAR_VARS)

LOCAL_MODULE := libdvr_loader

LOCAL_MODULE_OWNER := google

LOCAL_SRC_FILES := dvr_library_loader.cpp

include $(BUILD_SHARED_LIBRARY)

# Java platform library for vr stuff.

include $(CLEAR_VARS)

LOCAL_MODULE := com.google.vr.platform

LOCAL_MODULE_OWNER := google

LOCAL_REQUIRED_MODULES := libdvr_loader libdvr

LOCAL_SRC_FILES := $(call all-java-files-under, java)

include $(BUILD_JAVA_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := com.google.vr.platform.xml

LOCAL_SRC_FILES := com.google.vr.platform.xml

LOCAL_MODULE_TAGS := optional

LOCAL_MODULE_CLASS := ETC

LOCAL_MODULE_OWNER := google

LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/permissions

include $(BUILD_PREBUILT)

<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (C) 2017 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");

     you may not use this file except in compliance with the License.

     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software

     distributed under the License is distributed on an "AS IS" BASIS,

     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

     See the License for the specific language governing permissions and

     limitations under the License.

-->

<permissions>

    <library name="com.google.vr.platform"

             file="/system/framework/com.google.vr.platform.jar" />

</permissions>

#include <dlfcn.h>

#include <jni.h>

#include <string>

extern "C" {

JNIEXPORT jlong JNICALL

Java_com_google_vr_platform_Dvr_nativeLoadLibrary(

    JNIEnv* env, jclass, jstring java_library) {

  if (!java_library)

    return 0;

  // Convert the Java String object to a C++ null-terminated string.

  const char* data = env->GetStringUTFChars(java_library, NULL);

  size_t size = env->GetStringUTFLength(java_library);

  std::string library(data, size);

  env->ReleaseStringUTFChars(java_library, data);

  // Return the handle to the requested library.

  return reinterpret_cast<jlong>(

      dlopen(library.c_str(), RTLD_NOW | RTLD_LOCAL));

}

}  // extern "C"

package com.google.vr.platform;

import android.os.SystemProperties;

/**

 * Class to get information about the vr device.

 * @hide

 */

public class DeviceInfo {

    private static final String VR_MODE_BOOT = "ro.boot.vr";

    /**

     * Returns true if this device boots directly in VR mode.

     */

    public static boolean getVrBoot() {

        return SystemProperties.getBoolean(VR_MODE_BOOT, false);

    }

}

package com.google.vr.platform;

/**

 * Class to load the dvr api.

 * @hide

 */

public class Dvr {

    /**

     * Opens a shared library containing the dvr api and returns the handle to it.

     *

     * @return A Long object describing the handle returned by dlopen.

     */

    public static Long loadLibrary() {

        // Load a thin JNI library that runs dlopen on request.

        System.loadLibrary("dvr_loader");

        // Performs dlopen on the library and returns the handle.

        return nativeLoadLibrary("libdvr.so");

    }

    private static native long nativeLoadLibrary(String library);

}