judge app is installed

isInstallApp

public class IsInstalled {

    public static boolean isIntalled(Context context, String packageName) {
        boolean exist = false;
        PackageManager pm = context.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN, null);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> resolveInfoList = pm.queryIntentActivities(intent, 0);
        for (ResolveInfo resolveInfo : resolveInfoList) {
            if (resolveInfo.activityInfo.packageName.equals(packageName)) {
                exist = true;
            }
        }
        return exist;
    }

}