title: How to add serial port api as a library and use it in android studio?
body: <p>I am working on developing monitoring android app, using android studio. I would like to add android-serialport-api (<a href="https://code.google.com/p/android-serialport-api/" rel="nofollow noreferrer">https://code.google.com/p/android-serialport-api/</a>) as a library in my app and make serial communication possible in the project. I downlaod sources using SVN check out and using Cygwin. I was compiling NDK file and JNI File in serial port api then I copied all files and attached in the libraries file in my project. The project structure as below. </p>
  
  <p><a href="https://i.stack.imgur.com/8p8hn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8p8hn.png" alt="Project structure"></a></p>
  
  <p>and then I included the build.gradle file in android-serial-api like this.</p>
  
  <pre><code>buildscript {
  repositories {
      mavenCentral()
  }
  dependencies {
      classpath 'com.android.tools.build:gradle:0.12.+'
    }
   }
  apply plugin: 'android-library'
  
  android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
  
  defaultConfig {
  
      minSdkVersion 15
      targetSdkVersion 23
  }
  
  sourceSets {
      main {
          java.srcDirs = ['src']
          resources.srcDirs = ['src']
          aidl.srcDirs = ['src']
          renderscript.srcDirs = ['src']
          res.srcDirs = ['res']
          assets.srcDirs = ['assets']
  
          manifest.srcFile 'project/res/AndroidManifest.xml'
      }
  }
  </code></pre>
  
  <p>}</p>
  
  <p>I included this in app/build.gradle</p>
  
  <pre><code>compile project(':libraries:android-serialport-api')
  </code></pre>
  
  <p>In settings.gradle I also included this. </p>
  
  <pre><code>  include ':libraries:android-serialport-api'
  </code></pre>
  
  <p>androidmanifest.xml file is originally like this.</p>
  
  <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="android_serialport_api.sample"
  android:versionCode="3"
  android:versionName="1.2" &gt;
  
   &lt;application
  android:icon="@drawable/icon"
  android:label="@string/app_name"
  android:name="Application" &gt;
  &lt;activity
      android:label="@string/app_name"
      android:name="MainMenu" &gt;
      &lt;intent-filter &gt;
          &lt;action android:name="android.intent.action.MAIN" /&gt;
  
          &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
      &lt;/intent-filter&gt;
  &lt;/activity&gt;
  &lt;activity android:name="SerialPortPreferences" &gt;
  &lt;/activity&gt;
  &lt;activity android:name="ConsoleActivity" &gt;
  &lt;/activity&gt;
  &lt;activity android:name="LoopbackActivity" &gt;
  &lt;/activity&gt;
  &lt;activity android:name="Sending01010101Activity"&gt;&lt;/activity&gt;
  &lt;/application&gt;
  
  
  
  &lt;uses-sdk android:minSdkVersion="3" /&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>However, when I make the project. there are lots of error. So erased most of the codes. so now androidmanifest.xml in library is like this. </p>
  
  <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt;
   &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="android_serialport_api.sample"
     android:versionCode="3"
     android:versionName="1.2" &gt;
  
  &lt;uses-sdk android:minSdkVersion="3" /&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>After erasing them, I can make the project and gradle sycronized. But I don't know how to use serial.c sources from library I imported. How can I fix the program? There are some messages in the todo list. </p>
  
  <p>Please help me!!</p>