檢測用戶是否安裝某個第三方應用

/**
 * Created by y on 2016/2/26.
 */
public class IsApkUtils {

    public static boolean isApk(Context context, String packageName) {
        final PackageManager packageManager = context.getPackageManager();
        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);
        if (pinfo != null) {
            for (int i = 0; i < pinfo.size(); i++) {
                String pn = pinfo.get(i).packageName;
                if (pn.equals(packageName)) {
                    return true;
                }
            }
        }
        return false;
    }
}

一個context,一個包名