【Android】Check or go to spacified app

   1: String appPackage = "jp.naver.line.android";

   2: Intent intent = getPackageManager().getLaunchIntentForPackage(appPackage);

   3: if(intent!=null){

   4:     startActivity(intent);

   5: }else{

   6:     intent = new Intent(Intent.ACTION_VIEW);

   7:     intent.setData(Uri.parse("market://details?id="+appPackage));

   8: }

   9: startActivity(intent);