android 纯c/c++开发【百科全说】

新建一个Natvie工程

01

打开eclipse；
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打开菜单->File->New->Android Application；
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设置工程名，sdk版本，注意：主题设置为 None，点击next；
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Configure Project 是取消 Create activity 的复选框，点击next；
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Configure the attributes of the icon set，直接点击 next；
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Select whether to create an activity, and if so, what kind of activity. 点击 finish即可；
07

工程便创建出来了

配置Makefile

01

右键工程NativeTest->弹出菜单->Android Tools->Add Native Support...
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Settings for generated native components for project.界面直接点击Finish
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将 android.mk 的内容补充完整： LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := NativeTest LOCAL_SRC_FILES := NativeTest.cpp LOCAL_LDLIBS := -llog -landroid LOCAL_STATIC_LIBRARIES := android_native_app_glue include $(BUILD_SHARED_LIBRARY) $(call import-module,android/native_app_glue)
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增加一个 Application.mk 文件（这一步可选），并写入： APP_ABI := x86 APP_CPPFLAGS := --std=c++11 NDK_TOOLCHAIN_VERSION := 4.8

代码部分

01

1、 android_main：这个函数类似于win32开发的WinMain函数 2、app->onAppCmd = onAppCmd; app->onInputEvent = onInputEvent; 类似于win32中设置窗口的回掉函数 3、 while ((ident=ALooper_pollAll(-1, NULL, &events, (void**)&source)) >= 0) { // Process this event. if (source != NULL) { source->process(app, source); } // Check if we are exiting. if (app->destroyRequested != 0) { return; } } 这一段类似于win32的消息循环 4、为了方便大家粘贴， android_main函数的代码如下： void android_main(struct android_app* app) { // Make sure glue isn't stripped. app_dummy(); app->onAppCmd = onAppCmd; app->onInputEvent = onInputEvent; while (1) { int ident; int events; struct android_poll_source* source; while ((ident=ALooper_pollAll(-1, NULL, &events, (void**)&source)) >= 0) { // Process this event. if (source != NULL) { source->process(app, source); } // Check if we are exiting. if (app->destroyRequested != 0) { return; } } } }
02

onAppCmd描述的是真个activity的生命周期，类似于win32开发的消息处理回掉函数： static void onAppCmd(struct android_app* app, int32_t cmd) { switch (cmd) { case APP_CMD_SAVE_STATE: // The system has asked us to save our current state. Do so. __android_log_print(ANDROID_LOG_DEBUG, "fuke", "engine_handle_cmd APP_CMD_SAVE_STATE"); break; case APP_CMD_INIT_WINDOW: // The window is being shown, get it ready. __android_log_print(ANDROID_LOG_DEBUG, "fuke", "engine_handle_cmd APP_CMD_INIT_WINDOW"); break; case APP_CMD_TERM_WINDOW: __android_log_print(ANDROID_LOG_DEBUG, "fuke", "engine_handle_cmd APP_CMD_TERM_WINDOW"); break; case APP_CMD_GAINED_FOCUS: // When our app gains focus, we start monitoring the accelerometer. __android_log_print(ANDROID_LOG_DEBUG, "fuke", "engine_handle_cmd APP_CMD_GAINED_FOCUS"); break; case APP_CMD_LOST_FOCUS: // When our app loses focus, we stop monitoring the accelerometer. // This is to avoid consuming battery while not being used. __android_log_print(ANDROID_LOG_DEBUG, "fuke", "engine_handle_cmd APP_CMD_LOST_FOCUS"); break; } }
03

onInputEvent主要是用来触屏相关事件，也类似于win32开发的消息处理回掉函数，函数有两部分组成： 1、检测多点触屏，并通过logcat打印出多点触屏的信息； 2、控制屏幕颜色变化，每次松开手时颜色变化 3、为方便大家粘贴， onInputEvent函数的代码记录如下： static int32_t onInputEvent(struct android_app* app, AInputEvent* event) { if (AInputEvent_getType(event) == AINPUT_EVENT_TYPE_MOTION) { int nNum = AMotionEvent_getPointerCount(event); char szTrace[1024] = {0}; sprintf (szTrace, "engine_handle_input num=[%d]", nNum); for (int nIdx = 0; nIdx < nNum; nIdx++) { int nX = AMotionEvent_getX(event, 0); int nY = AMotionEvent_getY(event, 0); sprintf (strrchr(szTrace, 0), " (%d %d)", nX, nY); } __android_log_print(ANDROID_LOG_DEBUG, "colorspace", "%s", szTrace); if (AKeyEvent_getAction(event) != AKEY_EVENT_ACTION_UP) return 1; ANativeWindow_Buffer nativeWindow = {0}; int nRet = ANativeWindow_lock(app->pendingWindow, &nativeWindow, NULL); int nArea = nativeWindow.width * nativeWindow.height; unsigned long* pdwScreen = (unsigned long*)nativeWindow.bits; static int s_nClr = 0; unsigned long pdwClr[] = { 0x00000000, 0x000000ff, 0x0000ffff, 0x0000ff00, 0x00ffff00, 0x00ff0000, 0x00ff00ff, 0x00ffffff}; s_nClr ++; if (s_nClr > sizeof(pdwClr) / sizeof(unsigned long)) s_nClr = 0; for (int nIdx = 0; nIdx < nArea; nIdx++) { pdwScreen[nIdx] = pdwClr[s_nClr]; } ANativeWindow_unlockAndPost(app->pendingWindow); return 1; } return 0; }

设置工程属性

01

1、打开 AndroidManifest.xml 2、打开 Application 分页 3、增加一个 Activity 如下所示：
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1、选择右边的 Browse; 2、取消 "Display classes from sources of ..." 前面的复选框; 3、在搜索栏输入"na"，选中列出来的 "NativeActivity" 4、点击OK 效果如下：
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1、选中 android.app.nativeActivity 2、点击 add 3、选择 Meta Data 4、点击Ok
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输入： android:name="android.app.lib_name" android:value="NativeTest"
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1、选中 android.app.nativeActivity 2、点击 add 3、选择 Intent Filter 4、点击Ok
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1、选中 Intent Filter 2、点击 add 3、选择 Action 4、点击Ok 5、设置 android:name="android.intent.action.MAIN"
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1、选中 Intent Filter 2、点击 add 3、选择 Category 4、点击Ok 5、设置 android:name="android.intent.category.LAUNCHER"