开发多媒体播放器

packagecom.demo.pr5; importjava.io.File; importjava.util.Vector; importandroid.app.Activity; importandroid.content.Intent; importandroid.os.Bundle; importandroid.view.KeyEvent; importandroid.view.View; importandroid.view.ViewGroup; importandroid.widget.AdapterView; importandroid.widget.