在一个Android程序中启动另外一个Android程序

PackageManager packageManager = getPackageManager();
if (packageManager == null) {
return;
}

PackageInfo packageInfo = null;
try {
packageInfo = packageManager.getPackageInfo(packageName, 0);
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

if (packageInfo != null) {
// 打开app
Intent intent = packageManager.getLaunchIntentForPackage(packageName);
if (intent == null) {
return;
}

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}