如何在以下代码中调用另一个活动?
btnNext.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// check if next song is there or not
s2=val.size();
if(++s1>=s2){
s1=0;
}else{
uri2=tid.get(s1);
System.out.println("tid=="+uri2);
uri1=val.get(s1);
uri = uri1.replace(" ", "%20");
url="http://192.168.0.5/music/songs/mp3/"+uri;
playSong(url);
}