AS中ndk-build方式cpp问题集锦

<div class="output_wrapper" id="output_wrapper_id" style="font-size: 16px; color: rgb(62, 62, 62); line-height: 1.6; word-spacing: 0px; letter-spacing: 0px; font-family: 'Helvetica Neue', Helvetica, 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif;"><p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">想用c++代码在Java中调用，以前也一直OK调用.so库和jni接口，但不知道为何在AS3.0上一直报标准库找不到；</p> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">还有一个变更就是AS2.2之后ndk编译默认采用cmake了，这就致使之前的Android.mk和Application.mk文件写法不行了；但为了方便仍是使用了ndk-build方式（这块官方文档也是用的cmake，都没有ndk-build教程了，哎~）。没办法，以前对这块没经验，因此开始了填坑之旅。</p> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">目前还只有一个问题，之后填了新坑再补充。</p> <h2 id="hstringstd" style="color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px; font-weight: bold; font-size: 1.4em;"><span style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;">问题：找不到相似string和std等标准库函数</span></h2> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">首先要使用<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">ndk-build</code>形式进行编译cpp代码，须要修改一下<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">build.gradle</code>文件，如今新建c++项目都是用cmake了，因此咱们若是不用<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">cmake</code>要用<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">mdk-build</code>的话，须要改<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">build.gradle</code>文件；直接贴代码:</p> <h3 id="hbuildgradle" style="line-height: inherit; margin: 1.5em 0px; font-weight: bold; font-size: 1.3em; margin-bottom: 2em; margin-right: 5px; padding: 8px 15px; letter-spacing: 2px; background-image: linear-gradient(to right bottom, rgb(0, 188, 212), rgb(63, 81, 181)); background-color: rgb(63, 81, 181); color: rgb(255, 255, 255); border-left: 10px solid rgb(51, 51, 51); border-radius: 5px; text-shadow: rgb(102, 102, 102) 1px 1px 1px; box-shadow: rgb(102, 102, 102) 1px 1px 2px;"><span style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;">改动一：build.gradle</span></h3> <pre style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><code class="java language-java hljs" style="margin: 0px 2px; line-height: 18px; font-size: 14px; font-weight: normal; word-spacing: 0px; letter-spacing: 0px; font-family: Consolas, Inconsolata, Courier, monospace; border-radius: 0px; color: rgb(169, 183, 198); background: rgb(40, 43, 46); overflow-x: auto; padding: 0.5em; display: block !important; white-space: pre !important; word-wrap: normal !important; word-break: normal !important; overflow: auto !important;">android {<br> compileSdkVersion <span class="hljs-number" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(174, 135, 250); word-wrap: inherit !important; word-break: inherit !important;">26</span><br> defaultConfig {<br> applicationId <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"com.zhc.jnidemo"</span><br> minSdkVersion <span class="hljs-number" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(174, 135, 250); word-wrap: inherit !important; word-break: inherit !important;">15</span><br> targetSdkVersion <span class="hljs-number" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(174, 135, 250); word-wrap: inherit !important; word-break: inherit !important;">26</span><br> versionCode <span class="hljs-number" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(174, 135, 250); word-wrap: inherit !important; word-break: inherit !important;">1</span><br> versionName <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"1.0"</span><br> testInstrumentationRunner <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"android.support.test.runner.AndroidJUnitRunner"</span><br> externalNativeBuild {<br> ndkBuild {<br> <span class="hljs-comment" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(128, 128, 128); word-wrap: inherit !important; word-break: inherit !important;">// Sets optional flags for the C compiler.</span><br> cFlags <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"-D_EXAMPLE_C_FLAG1"</span>, <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"-D_EXAMPLE_C_FLAG2"</span><br><br> <span class="hljs-comment" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(128, 128, 128); word-wrap: inherit !important; word-break: inherit !important;">// Sets a flag to enable format macro constants for the C++ compiler.</span><br> cppFlags <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"-D__STDC_FORMAT_MACROS"</span><br> }<br> }<br> }<br> buildTypes {<br> release {<br> <span class="hljs-function" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(248, 35, 117); word-wrap: inherit !important; word-break: inherit !important;">minifyEnabled <span class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(248, 35, 117); word-wrap: inherit !important; word-break: inherit !important;">false</span><br> proguardFiles <span class="hljs-title" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(165, 218, 45); word-wrap: inherit !important; word-break: inherit !important;">getDefaultProguardFile</span><span class="hljs-params" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(255, 152, 35); word-wrap: inherit !important; word-break: inherit !important;">(<span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">'proguard-android.txt'</span>)</span>, 'proguard-rules.pro'<br> }<br> }<br> externalNativeBuild </span>{<br> ndkBuild {<br> path <span class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(238, 220, 112); word-wrap: inherit !important; word-break: inherit !important;">"src/main/jni/Android.mk"</span><br> }<br> }<br>}<br></code></pre> <h3 id="handroidmkapplicationmk" style="line-height: inherit; margin: 1.5em 0px; font-weight: bold; font-size: 1.3em; margin-bottom: 2em; margin-right: 5px; padding: 8px 15px; letter-spacing: 2px; background-image: linear-gradient(to right bottom, rgb(0, 188, 212), rgb(63, 81, 181)); background-color: rgb(63, 81, 181); color: rgb(255, 255, 255); border-left: 10px solid rgb(51, 51, 51); border-radius: 5px; text-shadow: rgb(102, 102, 102) 1px 1px 1px; box-shadow: rgb(102, 102, 102) 1px 1px 2px;"><span style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;">改动二：Android.mk、Application.mk</span></h3> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">这两个makefile文件都是在jni目录下的<br></p><figure style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><img src="http://upload-images.jianshu.io/upload_images/1638086-19677db8775b2793.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="image.png" title="image.png" style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; display: block; margin: 0px auto; max-width: 100%;"><figcaption style="line-height: inherit; margin: 0px; padding: 0px; margin-top: 10px; text-align: center; color: rgb(153, 153, 153); font-size: 0.7em;">image.png</figcaption></figure> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">Android.mk以下：</p> <pre style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><code class="mk language-mk hljs makefile" style="margin: 0px 2px; line-height: 18px; font-size: 14px; font-weight: normal; word-spacing: 0px; letter-spacing: 0px; font-family: Consolas, Inconsolata, Courier, monospace; border-radius: 0px; color: rgb(169, 183, 198); background: rgb(40, 43, 46); overflow-x: auto; padding: 0.5em; display: block !important; white-space: pre !important; word-wrap: normal !important; word-break: normal !important; overflow: auto !important;">LOCAL_PATH := <span class="hljs-variable" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(98, 151, 85); word-wrap: inherit !important; word-break: inherit !important;">$(<span class="hljs-built_in" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(248, 35, 117); word-wrap: inherit !important; word-break: inherit !important;">call</span> my-<span class="hljs-built_in" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(248, 35, 117); word-wrap: inherit !important; word-break: inherit !important;">dir</span>)</span><br><span class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(248, 35, 117); word-wrap: inherit !important; word-break: inherit !important;">include</span> <span class="hljs-variable" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(98, 151, 85); word-wrap: inherit !important; word-break: inherit !important;">$(CLEAR_VARS)</span><br><br>LOCAL_MODULE := native<br>LOCAL_SRC_FILES := native-lib.cpp<br>LOCAL_LDLIBS := -llog<br><span class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(248, 35, 117); word-wrap: inherit !important; word-break: inherit !important;">include</span> <span class="hljs-variable" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(98, 151, 85); word-wrap: inherit !important; word-break: inherit !important;">$(BUILD_SHARED_LIBRARY)</span><br></code></pre> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">Application.mk以下</p> <pre style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><code class="mk language-mk hljs makefile" style="margin: 0px 2px; line-height: 18px; font-size: 14px; font-weight: normal; word-spacing: 0px; letter-spacing: 0px; font-family: Consolas, Inconsolata, Courier, monospace; border-radius: 0px; color: rgb(169, 183, 198); background: rgb(40, 43, 46); overflow-x: auto; padding: 0.5em; display: block !important; white-space: pre !important; word-wrap: normal !important; word-break: normal !important; overflow: auto !important;"><span class="hljs-comment" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(128, 128, 128); word-wrap: inherit !important; word-break: inherit !important;">#APP_OPTIM := release</span><br>APP_PLATFORM := android-15<br>APP_ABI := armeabi-v7a<br>NDK_TOOLCHAIN_VERSION=4.9<br>APP_PIE := false<br><span class="hljs-comment" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(128, 128, 128); word-wrap: inherit !important; word-break: inherit !important;"># 重点是这句话：</span><br>APP_STL := stlport_static<br>APP_CFLAGS := -O3 -Wall -pipe \<br> -ffast-math \<br> -fstrict-aliasing -Werror=strict-aliasing \<br> -Wno-psabi -Wa,--noexecstack \<br> -DANDROID -DNDEBUG<br></code></pre> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">如今再clean项目，从新编译项目，就发现相似<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">#include &lt;string&gt;</code>找不到的问题没有了，但愿你们也能解决相同问题。</p> <h2 id="hc11shared_ptr" style="color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px; font-weight: bold; font-size: 1.4em;"><span style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;">问题：找不到C++ 11标准库shared_ptr</span></h2> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">在<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">Android.mk</code>文件中添加<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">APP_CFLAGS := -std=c++11</code>便可支持c++ 11函数，而后在<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">APP_STL :=</code>中指定<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">gnustl_static</code>能够支持最多的函数库。能够查看<a href="https://developer.android.com/ndk/guides/cpp-support.html?hl=zh-cn" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; text-decoration: none; color: rgb(30, 107, 184); word-wrap: break-word;">官方文档：C++ 库支持</a></p> <pre style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><code class="makefile language-makefile hljs" style="margin: 0px 2px; line-height: 18px; font-size: 14px; font-weight: normal; word-spacing: 0px; letter-spacing: 0px; font-family: Consolas, Inconsolata, Courier, monospace; border-radius: 0px; color: rgb(169, 183, 198); background: rgb(40, 43, 46); overflow-x: auto; padding: 0.5em; display: block !important; white-space: pre !important; word-wrap: normal !important; word-break: normal !important; overflow: auto !important;"><span class="hljs-comment" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: rgb(128, 128, 128); word-wrap: inherit !important; word-break: inherit !important;">#APP_OPTIM := release</span><br>APP_PLATFORM := android-15<br>APP_ABI := armeabi-v7a<br>NDK_TOOLCHAIN_VERSION=4.9<br>APP_PIE := false<br>APP_STL := gnustl_static<br>APP_CFLAGS := -O3 -Wall -pipe \<br> -ffast-math \<br> -fstrict-aliasing -Werror=strict-aliasing \<br> -Wno-psabi -Wa,--noexecstack \<br> -DANDROID -DNDEBUG \<br> -std=c++11<br></code></pre> <h2 id="hmustbeenabledwiththestdc11orstdgnu11compileroptions" style="color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px; font-weight: bold; font-size: 1.4em;"><span style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;">问题：must be enabled with the -std=c++11 or -std=gnu++11 compiler options</span></h2> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">解决办法是在<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">Android.mk</code>文件中加入支持c++11的flag</p> <pre style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><code class="mk language-mk hljs makefile" style="margin: 0px 2px; line-height: 18px; font-size: 14px; font-weight: normal; word-spacing: 0px; letter-spacing: 0px; font-family: Consolas, Inconsolata, Courier, monospace; border-radius: 0px; color: rgb(169, 183, 198); background: rgb(40, 43, 46); overflow-x: auto; padding: 0.5em; display: block !important; white-space: pre !important; word-wrap: normal !important; word-break: normal !important; overflow: auto !important;">LOCAL_CFLAGS += -std=c++11<br></code></pre> <h2 id="hmorethanonefilewasfoundwithosindependentpath" style="color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px; font-weight: bold; font-size: 1.4em;"><span style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;">问题：More than one file was found with OS independent path</span></h2> <blockquote style="line-height: inherit; display: block; padding: 15px 15px 15px 1rem; font-size: 0.9em; margin: 1em 0px; color: rgb(129, 145, 152); border-left: 6px solid rgb(220, 230, 240); background: rgb(242, 247, 251); overflow: auto; word-wrap: normal; word-break: normal;"> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 0px;">Error:Execution failed for task ':app:transformNativeLibsWithMergeJniLibsForDebug'.<br>More than one file was found with OS independent path 'lib/armeabi-v7a/libnative-lib.so'</p> </blockquote> <p style="font-size: inherit; color: inherit; line-height: inherit; padding: 0px; margin: 1.5em 0px;">删除<code style="font-size: inherit; line-height: inherit; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248);">build.gradle</code>下面的：</p> <pre style="font-size: inherit; color: inherit; line-height: inherit; margin: 0px; padding: 0px;"><code class="gradle language-gradle" style="padding: 2px 4px; margin: 0px 2px; color: rgb(233, 105, 0); background: rgb(248, 248, 248); line-height: 18px; font-size: 14px; font-weight: normal; word-spacing: 0px; letter-spacing: 0px; font-family: Consolas, Inconsolata, Courier, monospace; border-radius: 0px; display: block !important; white-space: pre !important; word-wrap: normal !important; word-break: normal !important; overflow: auto !important;"> // 删除一下代码<br> sourceSets.main {<br> jniLibs.srcDir('src/main/libs')<br> }<br></code></pre></div>