android 友盟分享 判断QQ，微信是否安装

public static boolean isWeixinAvilible(Context context) {        final PackageManager packageManager = context.getPackageManager();// 获取packagemanager        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);// 获取所有已安装程序的包信息        if (pinfo != null) {            for (int i = 0; i < pinfo.size(); i++) {                String pn = pinfo.get(i).packageName;                if (pn.equals("com.tencent.mm")) {                    return true;                }            }        }        return false;    }    /**     * 判断qq是否可用     *      * @param context     * @return     */    public static boolean isQQClientAvailable(Context context) {        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("com.tencent.mobileqq")) {                    return true;                }            }        }        return false;
    }
转载出处：http://www.jianshu.com/p/2a1d052b8139