指定启动包内的其他Activity

private void startOtherActivity(){  try {PackageInfo pInfo=getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_ACTIVITIES);ActivityInfo[] ainfos=pInfo.activities;String actName=ainfos[1].name;Intent intent=new Intent();intent.setComponent(new ComponentName(getPackageName(), actName));startActivity(intent);System.out.println(ainfos.length);} catch (NameNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}        }