How do I push a wallpaper to android?

I am in an operating systems course that centers around hacking up android phones开发者_JAVA技巧. I want to set my friend's wallpaper to something amusing but benign. Sadly, our test phones does not have wireless drivers on them. Any idea of how I can adb push something in?

Is there a wallpapers directory I can place things in, for instance?

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You could place it on the phones external storage:

Environment.getExternalStorageDirectory()

or you could create your own directory on the external storage:

                File root = new File(Environment
                        .getExternalStorageDirectory()
                        + File.separator + "MyAppName" + File.separator);
                root.mkdirs();