android native code 显示图片

些日子一直在纠结于android的东西，各种配环境、编译，终于告一小段落了。

用native code开发ndk提供的资源是远远不够的，要使用android源码这个超级sdk。具体方法就是下载好源码然后把自己写的代码和它的Android.mk文件放在源码根目录的一子目录里，然后在根目录make LOCAL_MODULE。

用native code显示图片由于网上很少有相关资料，所有费了一些劲。

Android.mk:

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES:= test.cppLOCAL_MODULE:= testbmpLOCAL_MODULE_TAGS := testsLOCAL_SHARED_LIBRARIES :=                libskia                libutils                libsurfaceflinger_client                libui $(info $(LOCAL_SHARED_LIBRARIES))include $(BUILD_EXECUTABLE)

test.cpp:

#include <core/SkCanvas.h>#include <core/SkDevice.h>#include <surfaceflinger/SurfaceComposerClient.h>using namespace android;#define SCREEN_WIDTH 480#define SCREEN_HEIGHT 640#define SCREEN_NUMBER 5#define ORIGIN_X 0#define ORIGIN_Y 0#define BACKGROUND_LAYER 100000#define FRONT_LAYER 120000sp<SurfaceComposerClient> g_uiClient;sp<SurfaceControl> g_bkSurfacecontrol;sp<SurfaceControl> g_ftSurfacecontrol[SCREEN_NUMBER];sp<Surface> g_bkSurface;sp<Surface> g_ftSurface[SCREEN_NUMBER];int p[10000] = {        0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,        0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,        0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,        0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,        0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,        0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,        0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000,        0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000,        0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000,        0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000, 0xffff0000,};int testInit(){    g_uiClient = new SurfaceComposerClient();    int i = 0;    g_ftSurfacecontrol[i] = g_uiClient->createSurface(getpid(), 0, SCREEN_WIDTH, SCREEN_HEIGHT, PIXEL_FORMAT_RGBA_8888);    g_ftSurface[i] = g_ftSurfacecontrol[i]->getSurface();    g_uiClient->openTransaction();    g_ftSurfacecontrol[i]->setLayer(FRONT_LAYER);    g_ftSurfacecontrol[i]->setSize(SCREEN_WIDTH, SCREEN_HEIGHT);    g_ftSurfacecontrol[i]->setPosition(ORIGIN_X + i * SCREEN_WIDTH, ORIGIN_Y);    g_uiClient->closeTransaction();    g_bkSurfacecontrol = g_uiClient->createSurface(getpid(), 0, SCREEN_WIDTH * 1, SCREEN_HEIGHT, PIXEL_FORMAT_RGBA_8888);    g_uiClient->openTransaction();    g_bkSurfacecontrol->setLayer(BACKGROUND_LAYER);    g_bkSurfacecontrol->setSize(SCREEN_WIDTH * SCREEN_NUMBER, SCREEN_HEIGHT);    g_bkSurfacecontrol->setPosition(ORIGIN_X, ORIGIN_Y);    g_uiClient->closeTransaction();    g_bkSurface = g_bkSurfacecontrol->getSurface();    return 0;}void BkFlushBufferDraw(int *p){    Surface::SurfaceInfo info;    g_bkSurface->lock(&info);    SkBitmap bitmap;    ssize_t bpr = info.s * bytesPerPixel(info.format);    bitmap.setConfig(SkBitmap::kARGB_8888_Config, info.w, info.h, (int)bpr);    bitmap.setPixels(info.bits);    SkCanvas* canvas = new SkCanvas(new SkDevice(bitmap));    canvas->setViewport(bitmap.width(), bitmap.height());    SkBitmap bitmap2;    bitmap2.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);    bitmap2.setPixels(p);    canvas->drawBitmap(bitmap2, (SkScalar)30.0,(SkScalar)30.0);    g_bkSurface->unlockAndPost();    sleep(100000000);}int main(){    testInit();    BkFlushBufferDraw(p);    return 0;}

然后make testbmp就可以了。

其中int p[]是图像的数组，每像素一字节，从低到高分别是RGBA。