[Android] Quick Copy/Extract files in assets to storage with java.nio

android_assets_copy.java

/*
    Change the file extension of the files in assets that your want to copy to 'jpg'.
    If you don't want change the extension, you can add 
    aaptOptions {
      noCompress 'pdf' //Change to the extension of your assets files
    }
    to build.gradle.
*/
AssetFileDescriptor fd = null;
FileChannel outChannel = null;
FileChannel inChannel = null;
try {
    fd = getAssets().openFd("AssetsFileName.pdf.jpg");
    inChannel = fd.createInputStream().getChannel();
    outChannel = new FileOutputStream("Destination.pdf").getChannel();
    inChannel.transferTo(fd.getStartOffset(), fd.getLength(), outChannel);
} catch (IOException e) {
} finally {
    try {
        if (outChannel != null) outChannel.close();
        if (inChannel != null) inChannel.close();
        if (fd != null) fd.close();
    } catch (IOException e) {
    }
}