Android studio Jni调用第三方库（CMakelist）

Jni项目生成的库文件需要调用硬件给的c++编写的so库，拿到so库跟头文件，jni通过CMakelist方式怎么调用c++写的so文件。。。

 

首先，创建项目，勾选support c/c++选项

接下来，就是配置CMakeList.text文件：

下面附上CMakeList的详细代码：

# Sets the minimum version of CMake required to build the native# library. You should either keep the default value or only pass a# value of 3.4.0 or lower.cmake_minimum_required(VERSION 3.4.1)#引用已经有的库find_library( # Sets the name of the path variable.              log-lib               # Specifies the name of the NDK library that              # you want CMake to locate.              log )#资源文件夹的位置libsset(distribution_DIR ${CMAKE_SOURCE_DIR}/../../../../libs)#导入类库,只是作为引用,不编译add_library( first             SHARED             IMPORTED )#引用目标类库是本地类库位置在libs/armeabi-v7a/xxx.soset_target_properties( first                       PROPERTIES IMPORTED_LOCATION                       ../../../../libs/armeabi-v7a/libfirst.so )#添加类库位置在src/main/cpp/xxx.cpp需要编译add_library(native-lib             SHARED             src/main/cpp/native-lib.cpp )#引入头文件目录位置include_directories(libs/jpeg)#将预构建库与你本地库相关联target_link_libraries( # Specifies the target library.                       native-lib first                       # Links the target library to the log library                       # included in the NDK.                       ${log-lib} )

然后点击MakeProject：

这时，如果没出什么意外的话，我们可以在 t\app\build\intermediates\cmake\debug\obj 下查看到生成的so文件

我们的Android项目即可调用此库做相应的操作了

但是要注意一点，因为我们的libnative-lib.so是依赖libfirst.so生成的，所以我们调用的时候需要将两个库都加载进去，不然会报错

public class MainActivity extends AppCompatActivity {    // Used to load the 'native-lib' library on application startup.    static {        System.loadLibrary("first");        System.loadLibrary("native-lib");    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // Example of a call to a native method        TextView tv = (TextView) findViewById(R.id.sample_text);        tv.setText(helloString("hi   kathy"));    }    /**     * A native method that is implemented by the 'native-lib' native library,     * which is packaged with this application.     */    public native String stringFromJNI();    public native String helloString(String hello);}

效果如图：

ok，that is all

不懂的可以下载相应的demo自行查看

有关其他的jni问题可以提出来相互讨论，刚刚接触，共同学习，共同进步

thanks~

DEMO下载：http://download.csdn.net/download/qq_35532751/10138080