Android应用市场的帮助类

写了一个Android应用市场的帮助类，如下：

public class MarketUtils {

    public static final String MARKET_DATA = "market://details";

    //判断应用市场是否存在

    public static boolean isMarketAvailable(Context context) {

        Intent intent = new Intent(Intent.ACTION_VIEW);

        intent.setData(Uri.parse(MARKET_DATA));

        List<ResolveInfo> list = context.getPackageManager().queryIntentActivities(intent, 0);

        if (list != null && list.size() > 0) {

            return true;

        }

        return false;

    }

    //跳转到应用市场

    public static void gotoMarket(Context context, String appPackageName, String marketPackageName) {

        try {

            Intent intent = new Intent(Intent.ACTION_VIEW);

            intent.setData(Uri.parse(String.format("%s?id=%s", MARKET_DATA, appPackageName)));

            if (!TextUtils.isEmpty(marketPackageName)) {

                intent.setPackage(marketPackageName);

            }

            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            context.startActivity(intent);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}