Android NDK: From Elementary to Expert Expisode 21

Last time, I wrote an AVI player app. When I began to generate the header file for the native function, I got an error:

Error: Cannot determine signature for Bitmap

Here is the right command:
On Mac and Linux:

javah -cp <Your android sdk path>/sdk/platforms/verision(such as:android-25)/android.jar:. <class name of your file>

On Windows:

javah -cp <Your android sdk path>/sdk/platforms/verision(such as:android-25)/android.jar;. <class name of your file>

After all, I generated the header file successfully.