发起另一个包

List<ResolveInfo> info = getPackageManager().queryIntentActivities(i, 0); 
String packageName=null, className=null; 
for ( ResolveInfo r: info){ 
    if ( r.activityInfo.packageName.startsWith("com.amazon.mp3")){ 
        packageName=r.activityInfo.packageName; 
        className=r.activityInfo.name; 
        break; 
    } 
} 
if ( packageName != null && className != null) 
    i.setClassName(packageName, className); 
startActivity(i);