Android 检测系统是否安装微信，微博，QQ

 /**
     * 检测是否安装微信
     *
     * @param context
     * @return
     */
    public static boolean isWxInstall(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;
    } /**
     * 检测是否安装微信
     *
     * @param