title: Android NDK Compile error NDK_PROJECT_PATH=null
body: <p>I tried run ijkplayer and I recieved this error.</p>
  
  <pre><code>  C:\ndk\ndk-build.cmd NDK_PROJECT_PATH=null 
  </code></pre>
  
  <p>I think is something with the build.gradle but I don't know what.</p>
  
  <p>My ndk directory is on <em>c:\ndk</em> and I have ndk 32bit.</p>
  
  <p>I appreciate your help.</p>
  
  <p>Thanks.</p>