问为没有Flash的Android的未来做准备

EN

if(isAppInstalled("com.google.android.youtube", getApplicationContext())) {
    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube://" + "WvYsIGYsgJQ"));
    intent.setClassName("com.google.android.youtube", "com.google.android.youtube.WatchActivity"); 
    startActivity(intent);
}
else {
    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.youtube.com/watch?v=WvYsIGYsgJQ")));
}

public static boolean isAppInstalled(String uri, Context context) {
    PackageManager pm = context.getPackageManager();
    boolean installed = false;
    try {
        pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
        installed = true;
    } catch (PackageManager.NameNotFoundException e) {
        installed = false;
    }
    return installed;
}